This illustration shows a massive star on the brink of explosion.
This illustration shows a massive star on the brink of explosion.
Chuck Carter/Caltech
Meet the fastest asteroid in our solar system, which zips around the sun every 113 days. This artist's rendering shows the asteroid 2021 PH27 (top right) and Mercury (below) orbiting the sun.
Meet the fastest asteroid in our solar system, which zips around the sun every 113 days. This artist's rendering shows the asteroid 2021 PH27 (top right) and Mercury (below) orbiting the sun.
CTIO/NOIRLab/NSF/AURA/J. da Silva
A ghostly set of X-ray rings were found around a black hole with a companion star. These rings are created by light echoes.
A ghostly set of X-ray rings were found around a black hole with a companion star. These rings are created by light echoes.
CXC/U.Wisc-Madison/S. Heinz et al./Pan-STARRS/NASA
This image, taken with the Atacama Large Millimeter/submillimeter Array in Chile, shows the PDS 70 system 400 light-years away. This planetary system is still forming and still in the process of being formed. One of the planets in the system has a moon-forming disk around it.
This image, taken with the Atacama Large Millimeter/submillimeter Array in Chile, shows the PDS 70 system 400 light-years away. This planetary system is still forming and still in the process of being formed. One of the planets in the system has a moon-forming disk around it.
ALMA/ESO/NAOJ/NRAO/Benisty et al.
This image shows supernova 2018zd (pictured as the large white dot on the right), a new type of supernova called an electron capture. To the left is the galaxy NGC 2146.
This image shows supernova 2018zd (pictured as the large white dot on the right), a new type of supernova called an electron capture. To the left is the galaxy NGC 2146.
NASA/STSCI/J. Depasquale; Las Cumbres Observatory
This image from the STARFORGE simulation shows the "Anvil of Creation," a giant gas cloud with individual stars forming inside of it.
This image from the STARFORGE simulation shows the "Anvil of Creation," a giant gas cloud with individual stars forming inside of it.
From Northwestern University/UT Austin
Astronomers used NASA's Chandra X-ray Observatory to study the supernova remnant Cassiopeia A and discovered titanium, shown in light blue, blasting out of it. The colors represent other elements detected, like iron (orange), oxygen (purple), silicon (red) and magnesium (green).
Astronomers used NASA's Chandra X-ray Observatory to study the supernova remnant Cassiopeia A and discovered titanium, shown in light blue, blasting out of it. The colors represent other elements detected, like iron (orange), oxygen (purple), silicon (red) and magnesium (green).
T. Sato et al./RIKEN/CXC/NASA
The supermassive black hole at the center of the M87 galaxy, the first to ever be imaged, can now be seen in polarized light. Swirling lines reveal the magnetic field near the edge of the black hole.
The supermassive black hole at the center of the M87 galaxy, the first to ever be imaged, can now be seen in polarized light. Swirling lines reveal the magnetic field near the edge of the black hole.
European Southern Observatory
This image from the Sloan Digital Sky Survey shows the galaxy J0437+2456, which includes a supermassive black hole at its center that appears to be moving.
This image from the Sloan Digital Sky Survey shows the galaxy J0437+2456, which includes a supermassive black hole at its center that appears to be moving.
Sloan Digital Sky Survey
This artist's impression shows how the distant quasar P172+18 and its radio jets may have looked 13 billion years ago. The light from the quasar has taken that long to reach us, so astronomers observed the quasar as it looked in the early universe.
This artist's impression shows how the distant quasar P172+18 and its radio jets may have looked 13 billion years ago. The light from the quasar has taken that long to reach us, so astronomers observed the quasar as it looked in the early universe.
M. Kornmesser/European Southern Observatory
This image shows the vicinity of the Tucana II ultrafaint dwarf galaxy, captured by the SkyMapper telescope.
This image shows the vicinity of the Tucana II ultrafaint dwarf galaxy, captured by the SkyMapper telescope.
Anirudh Chiti/MIT
These images show two giant radio galaxies found with using the MeerKAT telescope. The red in both images shows the radio light being emitted by the galaxies against a background of the sky as it is seen in visible light.
These images show two giant radio galaxies found with using the MeerKAT telescope. The red in both images shows the radio light being emitted by the galaxies against a background of the sky as it is seen in visible light.
I. Heywood/Oxford/Rhodes/SARAO
This artist's conception of quasar J0313-1806 depicts it as it was 670 million years after the Big Bang. Quasars are highly energetic objects at the centers of galaxies, powered by black holes and brighter than entire galaxies.
This artist's conception of quasar J0313-1806 depicts it as it was 670 million years after the Big Bang. Quasars are highly energetic objects at the centers of galaxies, powered by black holes and brighter than entire galaxies.
NOIRLab/NSF/AURA/J. da Silva
Shown here is a phenomenon known as zodiacal light, which is caused by sunlight reflecting off tiny dust particles in the inner solar system.
Shown here is a phenomenon known as zodiacal light, which is caused by sunlight reflecting off tiny dust particles in the inner solar system.
Zolt Levay/Space Telescope Science Institute
This artist's impression of the distant galaxy ID2299 shows some of its gas being ejected by a "tidal tail" as a result of a merger between two galaxies.
This artist's impression of the distant galaxy ID2299 shows some of its gas being ejected by a "tidal tail" as a result of a merger between two galaxies.
M. Kornmesser/ESO
This diagram shows the two most important companion galaxies to the Milky Way: the Large Magellanic Cloud (left) and the Small Magellanic Cloud. It was made using data from the European Space Agency Gaia satellite.
This diagram shows the two most important companion galaxies to the Milky Way: the Large Magellanic Cloud (left) and the Small Magellanic Cloud. It was made using data from the European Space Agency Gaia satellite.
Laurent Chemin/ESA/Gaia/DPAC
The Blue Ring Nebula is thought to be a never-before-seen phase that occurs after the merger of two stars. Debris flowing out from the merger was sliced by a disk around one of the stars, creating two cones of material glowing in ultraviolet light.
The Blue Ring Nebula is thought to be a never-before-seen phase that occurs after the merger of two stars. Debris flowing out from the merger was sliced by a disk around one of the stars, creating two cones of material glowing in ultraviolet light.
NASA/JPL-Caltech/M. Seibert/K. Hoadley/GALEX Team
The red supergiant star Betelgeuse, in the constellation of Orion, experienced unprecedented dimming late in 2019. This image was taken in January using the European Southern Observatory's Very Large Telescope.
The red supergiant star Betelgeuse, in the constellation of Orion, experienced unprecedented dimming late in 2019. This image was taken in January using the European Southern Observatory's Very Large Telescope.
ESO/M. Montargès et al.
This is an infrared image of Apep, a Wolf-Rayet star binary system located 8,000 light-years from Earth.
This is an infrared image of Apep, a Wolf-Rayet star binary system located 8,000 light-years from Earth.
European Southern Observatory
An artist's illustration, left, helps visualize the details of an unusual star system, GW Orionis, in the Orion constellation. The system's circumstellar disk is broken, resulting in misaligned rings around its three stars.
An artist's illustration, left, helps visualize the details of an unusual star system, GW Orionis, in the Orion constellation. The system's circumstellar disk is broken, resulting in misaligned rings around its three stars.
ESO/L. Cal?ada, Exeter/Kraus et al.
This is a simulation of two spiral black holes that merge and emit gravitational waves.
This is a simulation of two spiral black holes that merge and emit gravitational waves.
N. Fischer, H. Pfeiffer, A. Buonanno, MPIGP, SXS Collaboration
This artist's illustration shows the unexpected dimming of the star Betelgeuse.
This artist's illustration shows the unexpected dimming of the star Betelgeuse.
ESO, ESA/Hubble, M. Kornmesser
This extremely distant galaxy, which looks similar to our own Milky Way, appears like a ring of light.
This extremely distant galaxy, which looks similar to our own Milky Way, appears like a ring of light.
Rizzo et al./ALMA/European Southern Observatory
This artist's interpretation shows the calcium-rich supernova 2019ehk. The orange represents the calcium-rich material created in the explosion. Purple reveals gas shed by the star right before the explosion.
This artist's interpretation shows the calcium-rich supernova 2019ehk. The orange represents the calcium-rich material created in the explosion. Purple reveals gas shed by the star right before the explosion.
Aaron M. Geller, Northwestern University
The blue dot at the center of this image marks the approximate location of a supernova event which occurred 140 million light-years from Earth, where a white dwarf exploded and created an ultraviolet flash. It was located close to tail of the Draco constellation.
The blue dot at the center of this image marks the approximate location of a supernova event which occurred 140 million light-years from Earth, where a white dwarf exploded and created an ultraviolet flash. It was located close to tail of the Draco constellation.
Northwestern University
This radar image captured by NASA's Magellan mission to Venus in 1991 shows a corona, a large circular structure 120 miles in diameter, named Aine Corona.
This radar image captured by NASA's Magellan mission to Venus in 1991 shows a corona, a large circular structure 120 miles in diameter, named Aine Corona.
From NASA/JPL
When a star's mass is ejected during a supernova, it expands quickly. Eventually, it will slow and form a hot bubble of glowing gas. A white dwarf will emerge from this gas bubble and move across the galaxy.
When a star's mass is ejected during a supernova, it expands quickly. Eventually, it will slow and form a hot bubble of glowing gas. A white dwarf will emerge from this gas bubble and move across the galaxy.
Mark Garlick/University of Warwick
The afterglow of short gamma ray burst that was detected 10 billion light-years away is shown here in a circle. This image was taken by the Gemini-North telescope.
The afterglow of short gamma ray burst that was detected 10 billion light-years away is shown here in a circle. This image was taken by the Gemini-North telescope.
International Gemini Observatory/K. Paterson/W. Fong/Northwestern University
This Hubble Space Telescope image shows NGC 7513, a barred spiral galaxy 60 million light-years away. Due to the expansion of the universe, the galaxy appears to be moving away from the Milky Way at an accelerate rate.
This Hubble Space Telescope image shows NGC 7513, a barred spiral galaxy 60 million light-years away. Due to the expansion of the universe, the galaxy appears to be moving away from the Milky Way at an accelerate rate.
Hubble Space Telescope/NASA/ESA/M. Stiavelli
This artist's concept illustration shows what the luminous blue variable star in the Kinman Dwarf galaxy may have looked like before it mysteriously disappeared.
This artist's concept illustration shows what the luminous blue variable star in the Kinman Dwarf galaxy may have looked like before it mysteriously disappeared.
L. Cal?ada/ESO
This is an artist's illustration of a supermassive black hole and its surrounding disk of gas. Inside this disk are two smaller black holes orbiting one another. Researchers identified a flare of light suspected to have come from one such binary pair soon after they merged into a larger black hole.
This is an artist's illustration of a supermassive black hole and its surrounding disk of gas. Inside this disk are two smaller black holes orbiting one another. Researchers identified a flare of light suspected to have come from one such binary pair soon after they merged into a larger black hole.
Robert Hurt/California Institute of Technology
This image, taken from a video, shows what happens as two objects of different masses merge together and create gravitational waves.
This image, taken from a video, shows what happens as two objects of different masses merge together and create gravitational waves.
Max Planck Institute for Gravitational Physics/Simulating eXtreme Spacetimes (SXS) Collaboration
This is an artist's impression showing the detection of a repeating fast radio burst seen in blue, which is in orbit with an astrophysical object seen in pink.
This is an artist's impression showing the detection of a repeating fast radio burst seen in blue, which is in orbit with an astrophysical object seen in pink.
Kristi Mickaliger
Fast radio bursts, which make a splash by leaving their host galaxy in a bright burst of radio waves, helped detect "missing matter" in the universe.
Fast radio bursts, which make a splash by leaving their host galaxy in a bright burst of radio waves, helped detect "missing matter" in the universe.
ICRAR
A new type of explosion was found in a tiny galaxy 500 million light-years away from Earth. This type of explosion is referred to as a fast blue optical transient.
A new type of explosion was found in a tiny galaxy 500 million light-years away from Earth. This type of explosion is referred to as a fast blue optical transient.
Giacomo Terreran/Northwestern University
Astronomers have discovered a rare type of galaxy described as a "cosmic ring of fire." This artist's illustration shows the galaxy as it existed 11 billion years ago.
Astronomers have discovered a rare type of galaxy described as a "cosmic ring of fire." This artist's illustration shows the galaxy as it existed 11 billion years ago.
James Josephides/Swinburne Astronomy Productions
This is an artist's impression of the Wolfe Disk, a massive rotating disk galaxy in the early universe.
This is an artist's impression of the Wolfe Disk, a massive rotating disk galaxy in the early universe.
NRAO/AUI/NSF, S. Dagnello
A bright yellow "twist" near the center of this image shows where a planet may be forming around the AB Aurigae star. The image was captured by the European Southern Observatory's Very Large Telescope.
A bright yellow "twist" near the center of this image shows where a planet may be forming around the AB Aurigae star. The image was captured by the European Southern Observatory's Very Large Telescope.
ESO/Boccaletti et al.
This artist's illustration shows the orbits of two stars and an invisible black hole 1,000 light-years from Earth. This system includes one star (small orbit seen in blue) orbiting a newly discovered black hole (orbit in red), as well as a third star in a wider orbit (also in blue).
This artist's illustration shows the orbits of two stars and an invisible black hole 1,000 light-years from Earth. This system includes one star (small orbit seen in blue) orbiting a newly discovered black hole (orbit in red), as well as a third star in a wider orbit (also in blue).
European Southern Observatory/ESO/L. Cal?ada
This illustration shows a star's core, known as a white dwarf, pulled into orbit around a black hole. During each orbit, the black hole rips off more material from the star and pulls it into a glowing disk of material around the black hole. Before its encounter with the black hole, the star was a red giant in the last stages of stellar evolution.
This illustration shows a star's core, known as a white dwarf, pulled into orbit around a black hole. During each orbit, the black hole rips off more material from the star and pulls it into a glowing disk of material around the black hole. Before its encounter with the black hole, the star was a red giant in the last stages of stellar evolution.
NASA/CXO/CSIC-INTA/G.Miniutti et al./CXC/M. Weiss
This artist's illustration shows the collision of two 125-mile-wide icy, dusty bodies orbiting the bright star Fomalhaut, located 25 light-years away. The observation of the aftermath of this collision was once thought to be an exoplanet.
This artist's illustration shows the collision of two 125-mile-wide icy, dusty bodies orbiting the bright star Fomalhaut, located 25 light-years away. The observation of the aftermath of this collision was once thought to be an exoplanet.
M. Kornmesser/ESA/NASA
This is an artist's impression of the interstellar comet 2I/Borisov as it travels through our solar system. New observations detected carbon monixide in the cometary tail as the sun heated the comet.
This is an artist's impression of the interstellar comet 2I/Borisov as it travels through our solar system. New observations detected carbon monixide in the cometary tail as the sun heated the comet.
NRAO/AUI/NSF/S. Dagnello
This rosette pattern is the orbit of a star, called S2, around the supermassive black hole at the center of our Milky Way galaxy.
This rosette pattern is the orbit of a star, called S2, around the supermassive black hole at the center of our Milky Way galaxy.
European Southern Observatory/ESO/L. Cal?ada
This is an artist's illustration of SN2016aps, which astronomers believe is the brightest supernova ever observed.
This is an artist's illustration of SN2016aps, which astronomers believe is the brightest supernova ever observed.
M. Weiss/Center for Astrophysics | Harvard & Smithsonian
This is an artist's illustration of a brown dwarf, or a "failed star" object, and its magnetic field. The brown dwarf's atmosphere and magnetic field rotate at different speeds, which allowed astronomers to determine wind speed on the object.
This is an artist's illustration of a brown dwarf, or a "failed star" object, and its magnetic field. The brown dwarf's atmosphere and magnetic field rotate at different speeds, which allowed astronomers to determine wind speed on the object.
Bill Saxton, NRAO/AUI/NSF
This artist's illustration shows an intermediate-mass black hole tearing into a star.
This artist's illustration shows an intermediate-mass black hole tearing into a star.
M. Kornmesser/ESA/Hubble
This is an artist's impression of a large star known as HD74423 and its much smaller red dwarf companion in a binary star system. The large star appears to pulsate on one side only, and it's being distorted by the gravitational pull of its companion star into a teardrop shape.
This is an artist's impression of a large star known as HD74423 and its much smaller red dwarf companion in a binary star system. The large star appears to pulsate on one side only, and it's being distorted by the gravitational pull of its companion star into a teardrop shape.
Gabriel Pérez Díaz/Institute of Astrophysics of the Canary Islands
This is an artist's impression of two white dwarfs in the process of merging. While astronomers expected that this might cause a supernova, they have found an instance of two white dwarf stars that survived merging.
This is an artist's impression of two white dwarfs in the process of merging. While astronomers expected that this might cause a supernova, they have found an instance of two white dwarf stars that survived merging.
University of Warwick/Mark Garlick
A combination of space and ground-based telescopes have found evidence for the biggest explosion seen in the universe. The explosion was created by a black hole located in the Ophiuchus cluster's central galaxy, which has blasted out jets and carved a large cavity in the surrounding hot gas.
A combination of space and ground-based telescopes have found evidence for the biggest explosion seen in the universe. The explosion was created by a black hole located in the Ophiuchus cluster's central galaxy, which has blasted out jets and carved a large cavity in the surrounding hot gas.
S. Giacintucci, et al./NRL/CXC/NASA
This new ALMA image shows the outcome of a stellar fight: a complex and stunning gas environment surrounding the binary star system HD101584.
This new ALMA image shows the outcome of a stellar fight: a complex and stunning gas environment surrounding the binary star system HD101584.
ESO/NAOJ/NRAO/ALMA
NASA's Spitzer Space Telescope captured the Tarantula Nebula in two wavelengths of infrared light. The red represents hot gas, while the blue regions are interstellar dust.
NASA's Spitzer Space Telescope captured the Tarantula Nebula in two wavelengths of infrared light. The red represents hot gas, while the blue regions are interstellar dust.
JPL-Caltech/NASA
A white dwarf, left, is pulling material off of a brown dwarf, right, about 3,000 light-years from Earth.
A white dwarf, left, is pulling material off of a brown dwarf, right, about 3,000 light-years from Earth.
NASA/L. Hustak
This image shows the orbits of the six G objects at the center of our galaxy, with the supermassive black hole indicated with a white cross. Stars, gas and dust are in the background.
This image shows the orbits of the six G objects at the center of our galaxy, with the supermassive black hole indicated with a white cross. Stars, gas and dust are in the background.
Anna Ciurlo/Tuan Do/UCLA Galactic Center Group
After stars die, they expel their particles out into space, which form new stars in turn. In one case, stardust became embedded in a meteorite that fell to Earth. This illustration shows that stardust could flow from sources like the Egg Nebula to create the grains recovered from the meteorite, which landed in Australia.
After stars die, they expel their particles out into space, which form new stars in turn. In one case, stardust became embedded in a meteorite that fell to Earth. This illustration shows that stardust could flow from sources like the Egg Nebula to create the grains recovered from the meteorite, which landed in Australia.
NASA/W. Sparks (STScI)/R. Sahai
The former North Star, Alpha Draconis or Thuban, is circled here in an image of the northern sky.
The former North Star, Alpha Draconis or Thuban, is circled here in an image of the northern sky.
NASA
Galaxy UGC 2885, nicknamed the "Godzilla galaxy," may be the largest one in the local universe.
Galaxy UGC 2885, nicknamed the "Godzilla galaxy," may be the largest one in the local universe.
NASA/ESA/B. Holwerda (University of Louisville)
The host galaxy of a newly traced repeating fast radio burst acquired with the 8-meter Gemini-North telescope.
The host galaxy of a newly traced repeating fast radio burst acquired with the 8-meter Gemini-North telescope.
Danielle Futselaar/artsource.nl
Wonders of the universe
CNN  — 

There are nearly 2 billion stars in our galaxy.

At least that’s what the most current map shows. Astronomers have mapped the most extensive atlas of our Milky Way galaxy yet, including the positions of each and every one of those stars.

The European Space Agency’s Gaia space observatory also tracked the movement, colors and brightness of these stars as well as the first visible measurement of the acceleration of our solar system.

The new data confirms that the solar system is accelerating in its orbit around the Milky Way. Over the course of a year, our sun accelerates toward the Milky Way’s center by 7 millimeters a second. Overall, the sun’s orbit around the Milky Way is about 230 kilometers per second, or 514,495 miles per hour.

This acceleration information will allow astronomers to measure the mass of our galaxy and better understand the origins of our solar system within our galaxy.

This is the third publicly available data release from the space telescope. The data was made available on Thursday.

The so-called “Galaxy Surveyor” telescope helped scientists produce the most accurate three-dimensional map of our galaxy to date.

An illustration representing the legacy of NASA's Kepler space telescope. After nine years in deep space collecting data that revealed our night sky to be filled with billions of hidden planets -- more planets even than stars -- NASA's Kepler space telescope ran out of fuel needed for further science operations in 2018.
An illustration representing the legacy of NASA's Kepler space telescope. After nine years in deep space collecting data that revealed our night sky to be filled with billions of hidden planets -- more planets even than stars -- NASA's Kepler space telescope ran out of fuel needed for further science operations in 2018.
NASA/Ames Research Center/W. Stenzel/D. Rutter

Related article There are at least 300 million potentially habitable planets in our galaxy, NASA finds

Gaia is uniquely positioned about 930,000 miles from Earth in the opposite direction from the sun. The spacecraft, launched in 2013, carries two telescopes that can scan our galaxy from a location called the Lagrange 2, or L2, point. At this point, the spacecraft is able to remain in a stable spot due to the balance of gravitational forces between Earth and the sun.

This also means that the spacecraft doesn’t have any interference from Earth’s light and it can use the minimum amount of fuel to remain in a fixed position.

The vantage point allows Gaia to have unfettered views and continuously scan our galaxy. The observatory can determine the age of the stars it surveys by collecting information about their temperatures and compositions – a bit like a stellar checkup.(

Gaia measures the distances of stars by tracking their movements – something that is much harder to do on Earth because our atmosphere obscures this tiny stellar movement from the perspective of ground-based telescopes.

Still from a simulation of individual galaxies forming, starting at a time when the Universe was just a few million years old.
Still from a simulation of individual galaxies forming, starting at a time when the Universe was just a few million years old.
Robyn Sanderson/University of Pennsylvania, and Center of Computational astrophysics

Related article New stars found in the Milky Way were born outside of it

Previously, Gaia was able to track the positions of 1.6 billion stars. This latest data release brings the map up to just below 2 billion stars. What’s more, the positions have been calculated more accurately.

“Gaia is measuring the distances of hundreds of millions of objects that are many thousands of light years away, at an accuracy equivalent to measuring the thickness of hair at a distance of more than 2000 kilometres,” said Floor van Leeuwen, astronomer at the University of Cambridge’s Institute of Astronomy and UK Gaia DPAC project manager, in a statement.

“These data are one of the backbones of astrophysics, allowing us to forensically analyse our stellar neighbourhood, and tackle crucial questions about the origin and future of our Galaxy.”

The new data has particularly accurate measurements for the 300,000 stars located within 326 light-years of our sun. Understanding the positions of these stars now enables astronomers to predict how they will change in the next 1.6 million years.

Courtesy of Sijie Yu / UCI A simulated galaxy image from the FIRE-2 project, representing a structure spanning more than 200,000 light years, shows the prominent plumes of young blue stars born in gas that was originally rotating and then blown radially outward by supernova explosions.
Courtesy of Sijie Yu / UCI A simulated galaxy image from the FIRE-2 project, representing a structure spanning more than 200,000 light years, shows the prominent plumes of young blue stars born in gas that was originally rotating and then blown radially outward by supernova explosions.
Courtesy of Sijie Yu/University of California - Irvine

Related article The Milky Way may be kicking stars into its outer halo

The information collected by Gaia also allowed astronomers a glimpse at the stars that populate two of the Milky Way’s companion galaxies, the Small and Large Magellanic Clouds.

Gaia is currently scheduled to continue collecting star data through 2020, and its mission could be extended until 2025. Ultimately, researchers anticipate that Gaia will be able to provide more accuracy and collect a total catalog of more than 2 billion objects at mission’s end.

The mission was designed to add to our knowledge of the Milky Way based on information gathered by the Hipparcos satellite used in the 1980s and 1990s. It mapped 100,000 stars. When Gaia came online and had its first data release in 2016, it increased the number of observable stars in our galaxy times 20.

“For thousands of years, we have been preoccupied with noting and detailing the stars and their precise locations as they expanded humanity’s understanding of our cosmos,” said Caroline Harper, head of space science at the UK Space Agency, in a statement.

“Gaia has been staring at the heavens for the past seven years, mapping the positions and velocities of stars. Thanks to its telescopes we have in our possession today the most detailed billion-star 3D atlas ever assembled.”