X-ray Images
Chandra Mission
X-ray Astronomy
Chandra People
Chandra in HD
Standard Definition
The Invisible Sky
Two Inch Universe
By Date/Category
Other Features
Animations & Video
Special Features
3D Files and Resources
Q & A
Acronym Guide
Further Reading
Desktop Images
iPhone Wallpapers
By Date/Category
Image Handouts
Chandra Lithographs
Chandra Infographics
Educational Activities
Printable Games
Chandra Fact Sheets
Entire Collection
By Date
By Category
Web Shortcuts
Chandra Blog
RSS Feed
Chandra Mobile
Email Newsletter
News & Noteworthy
Image Use Policy
Questions & Answers
Glossary of Terms
Download Guide
Get Adobe Reader
Problems Viewing?
Having trouble viewing a movie? Make sure you update your video plug-ins. Visit our download center for help.
More Information
Black Holes
X-ray Astronomy Field Guide
Black Holes
Questions and Answers
Black Holes
Chandra Images
Black Holes
Animations & Video: Black Holes
Page 1234567
Click for high-resolution animation
1. Megaflares Shed Light On Our Black Hole
QuicktimeMPEG Our Galaxy is shaped like a whirlpool, with long strips of cosmic gas and dust swirling around the center. And like a whirlpool, objects that float too close are dragged into the center never to be seen again.

The fate of these unfortunate objects is no mystery. Lurking in the dark at the heart of our Galaxy is gigantic, hungry monster - a supermassive black hole. Supermassive black holes are famous for their ability to swallow anything – even light! But they don't just eat; they sometimes spit too!

In late 2013, an outburst (what astronomers call 'flares') was spotted blasting from the center of our Galaxy. Like many flares, it was made up of high-energy X-rays. However, this particular outburst was 400 times brighter than the X-ray output normally seen coming from this black hole!

A little more than a year later, it let off another flare, this time it was 200 times brighter than usual.

Astronomers have two theories about what could be causing these so-called "megaflares". The first idea is that the black hole's strong gravity tore apart an asteroid that strayed too close. The debris was then heated to millions of degrees before being devoured.

The other possible explanation involves the strong magnetic fields around the black hole. If these magnetic fields wobbled somehow, it could cause a large burst of X-rays. In fact, such events are seen regularly on our own Sun, we call them solar flares.

The main part of this picture shows the area around the supermassive black hole at the center of our Galaxy, called Sagittarius A* (pronounced as "SAJ-ee-TARE-ee-us A-star"). The small box shows a close up of the black hole and the giant flare from 2013.
[Runtime: 02:42]
(NASA/CXC/April Jubett)

Related Chandra Images:

Click for high-resolution animation
2. Tour of Sagittarius A*
QuicktimeMPEG Since NASA's Chandra X-ray Observatory was launched over 15 years ago, it has frequently turned its gaze to the center of the Milky Way galaxy. One of the reasons is that at the center of our Galaxy there is a black hole, which astronomers now estimate contains about four and a half million times the mass of the Sun. This makes this object, called Sagittarius A*, the closest supermassive black hole to us. Over the years, astronomers have learned many things about Sagittarius A* and it continues to surprise and intrigue scientists to this day. On September 13, 2013, astronomers saw a flare from Sagittarius A* that was 400 times brighter than its usual X-ray output. A little more than a year later, astronomers again used Chandra to see another flare from Sagittarius A* that was 200 times brighter than its normal state in October 2014.

What's going on with the Milky Way's biggest black hole? Astronomers have two theories about what could be causing these "megaflares" from Sagittarius A*. The first idea is that the intense gravity around the black hole ripped apart an asteroid that wandered too close. As the asteroid's debris swirled around the black hole, it would have been heated to temperatures that cause it to emit X-rays before passing over the edge of the black hole. The other proposed explanation involves the strong magnetic fields that exist around Sagittarius A*. If the magnetic field lines reconfigured themselves and reconnected, this could also create a large burst of X-rays. Scientists see flares happen regularly on the Sun and the events around Sgr A* appear to have a similar pattern in intensity levels to those. Whatever the final explanation is for these flares, scientists will continue to observe Sagittarius A* with Chandra and will undoubtedly make more fascinating discoveries about our Galaxy’s supermassive black hole.
[Runtime: 02:30]
(NASA/CXC/A. Hobart)

Related Chandra Images:

Click for high-resolution animation
3. Tour of Sagittarius A*
QuicktimeMPEG One of the biggest mysteries in astrophysics today is figuring out where mysterious particles called neutrinos come from. Neutrinos are tiny particles that carry no charge and interact very weakly with electrons and protons. Unlike light or charged particles, neutrinos can emerge from deep within their sources and travel across the universe without being absorbed by intervening matter or, in the case of charged particles, deflected by magnetic fields.

The Earth is constantly bombarded with neutrinos from the sun. However, neutrinos from beyond the solar system can be millions or billions of times more energetic. Scientists have long been searching for the origin of these very energetic neutrinos.

Now scientists have a new clue in their hunt for the source of neutrinos. By analyzing data from three X-ray telescopes, including Chandra, researchers have found a connection between flares generated by the supermassive black hole at the center of the Milky Way and the arrival of high-energy neutrinos at a detector under the South Pole. In fact, the facility in Antarctica, called the IceCube Neutrino Observatory, saw one of these high-energy neutrinos less than three hours after Chandra detected the largest flare ever from the Milky Way's supermassive black hole. The Swift and NuSTAR X-ray telescopes also recorded flares that were later tied to IceCube neutrino detections.

While it's too early to say if the Milky Way's black hole is definitively generating high-energy neutrinos, the latest results are a promising lead for scientists to follow.
[Runtime: 01:52]
(NASA/CXC/A. Hobart)

Related Chandra Images:

Click for high-resolution animation
4. Tour of M82X-2
QuicktimeMPEG Ultraluminous X-ray Sources, or ULXs, are unusual objects. They are rare and, as their name implies, give off enormous amounts of X-rays. Until now, astronomers thought that ULXs were powered by a system where a stellar mass black hole was in orbit around a neutron star or black hole. However, a study using data from NASA's NuSTAR and Chandra X-ray Observatory shows that this class of objects is more diverse than that. With NuSTAR, astronomers discovered regular variations, or pulsations, coming from a small region in the center of the galaxy M82, which is located about 11.4 million light years from Earth. The researchers then used Chandra, with its exceptionally keen vision in X-ray light, to pinpoint exactly which source was giving off these pulsations. This source is called M82X-2. It's hard to explain how a system with a black hole could generate the pulsations seen by NuSTAR. Because of this and other data, astronomers think that M82X-2 is the brightest pulsar ever seen. Pulsars are rapidly spinning neutron stars that sweep beams of radiation out like a lighthouse, and this is what would explain the pulsations of X-ray light seen in M82X-2. ULXs just became a little more unusual and intriguing to study.
[Runtime: 01:43]
(NASA/CXC/A. Hobart)

Related Chandra Images:

Click for high-resolution animation
5. Tour of RX J1131-1231
QuicktimeMPEG Black holes seem like such mysterious and complicated objects. On one hand, they are, and astronomers have been studying them for decades to learn more. On the other, black holes are actually quite simple. By this, we mean that black holes are defined by just two simple characteristics: their mass and their spin. While astronomers have long been able to measure black hole masses very effectively, determining their spins has been much more difficult. A new result from researchers using data from NASA's Chandra X-ray Observatory and ESA's XMM-Newton takes a step in addressing the spin question. By a lucky alignment, the light from a quasar some 6 billion light years has been magnified and amplified due to an effect called gravitational lensing. This allowed researchers to get detailed information about the amount of X-rays seen at different energies. This, in turn, gave the researchers information about how fast the supermassive black hole at the center of the quasar is spinning. When combined with the spins from other black holes using more indirect methods, astronomers are beginning to better understand just how black holes grow over time across the Universe.
[Runtime: 01:30]
(NASA/CXC/A. Hobart)

Related Chandra Images:

Click for high-resolution animation
6. I Can See Your Halo
QuicktimeMPEG The Universe is enormous and full of empty space. Light from the nearest star outside our solar system has to travel through empty black space for 4.2 years before it reaches our eyes, even though light moves faster than anything else in the Universe and we live in a very densely populated region of space! Yet somehow, despite all this empty space, galaxies crashing into each other is a fairly common sight. One such collision has been caught in this cosmic picture; which shows the enormous cloud of hot gas surrounding two large colliding galaxies called NGC 6240.

The two large spiral galaxies seen in this picture are similar in size and shape to our home galaxy, the Milky Way. Both galaxies are believed to be harbouring supermassive black holes at their centres, which are spiralling towards each other as we speak. It's likely that they will eventually merge together to form an even bigger black hole!

Another consequence of this pile up is the birth of millions of new stars in a 'stellarbaby boom' that has lasted over 200 million years! This was caused by the violent collision, which stirred up the gases in each galaxy. The baby boom resulted in the birth of many stars much more massive than the Sun. These then ended their lives in powerful supernova explosions, pumping material into the enormous gas cloud: a 'halo' of hot gas, which can be seen in this picture. And it contains enough material to make 10 billion Suns!
[Runtime: 02:01]
(NASA/CXC/April Jubett)

Related Chandra Images:

Click for high-resolution animation
7. Tour of Sagittarius A*
QuicktimeMPEG Jets of high-energy particles are found throughout the Universe on large and small scales. They are produced by young stars and by giant black holes. Jets play important roles in transporting energy away from the central object and, on a galactic scale, in regulating the rate of formation of new stars.

Because of that, astronomers have been searching for decades for a jet from the Milky Way's black hole known as Sagittarius A*. Over the years, there have been several reports of hints of a jet from Sgr A*, but none was conclusive. A new study involving data from NASA's Chandra X-ray Observatory and the Very Large Array, however, has provided the best case yet for a jet from our Galaxy's supermassive black hole.

One piece of evidence is a straight line of X-rays that points to Sgr A*. Another is the discovery of a shock front - akin to a sonic boom - seen in radio data, where the jet appears to be striking a cloud of gas. By combining these clues with other information, astronomers think they have the strongest evidence to date for a jet blasting out of Sgr A*. The likely discovery of a jet from Sgr A* helps astronomers learn more about the giant black hole, including how it is spinning.
[Runtime: 01:32]
(NASA/CXC/April Jubett)

Related Chandra Images:

Click for high-resolution animation
8. Beyond the Horizon

For a long time people believed that the Earth was flat and that if you sailed too far you'd fall over the edge! It seems funny they could have thought that, because now we're lucky enough to have pictures of our entire planet and we can see its shape (take a look at image 2). But it took some pretty impressive technology to get these pictures, which wasn't available to our ancient ancestors. Did you know you have to travel about 20,000 kilometres from Earth to be able to see the entire planet?

Now imagine how far into space you'd have to travel to fit all the 300 billion stars of the Milky Way (our Galaxy) into one shot! This is way beyond our abilities at the moment, but we can photograph small sections of the Galaxy. This picture from the Chandra X-ray Observatory shows the very centre of the Milky Way. This is the most chaotic and dangerous part of the Galaxy, and home to a supermassive black hole.

Anything that gets too close to a black hole is pulled into it with such a strong force that it has no chance of escape. The boundary that marks the point of no return is called the event horizon. Past this not even light will return: this monster will pull it in forever. The blue haze in this picture includes piping-hot gas floating perilously close to the event horizon of our Galaxy's supermassive black hole. But astronomers have found that just a tiny amount of this gas will be gobbled up by the black hole, and the rest will be "spat out" before it gets too close.

[Runtime: 02:03]
(NASA/CXC/April Jubett)

Related Chandra Images:

Click for high-resolution animation
9. Tour of M31
QuicktimeMPEG Many consider Andromeda, also known as Messier 31, to be a sister galaxy to our own Milky Way. At a distance of only 2.5 million light years away, Andromeda is relatively close to our Galaxy. It is also a spiral galaxy like the Milky Way, and has many similar characteristics. However, a new study using data from NASA's Chandra X-ray Observatory has pointed out some interesting differences between these two galaxies when it comes to black holes. After combining over 150 Chandra observations spread over 13 years, researchers discovered 26 new black hole candidates in Andromeda. This is largest number to date found in a galaxy outside our own. Falling into the stellar-mass category, these black holes form when the most massive stars collapse. The result is a black hole that typically has between five and ten times the mass of the Sun. Seven of these black hole candidates are within 1,000 light years of Andromeda's center, more than what is found near the center of our Milky Way's core. This highlights that although Andromeda and the Milky Way are alike in many ways, they do have their differences. Astronomers have long known that the bulge of stars in Andromeda is bigger as is the super massive black hole at its center. Now we know that it may be a better producer of small black holes as well.
[Runtime: 01:45]
(NASA/CXC/J. DePasquale)

Related Chandra Images:
  • Photo Album: M31

Click for high-resolution animation
10. Tour of NGC 6240
QuicktimeMPEG Two large galaxies are colliding and scientists have used Chandra to make a detailed study of an enormous cloud of hot gas that surrounds them. This unusually large reservoir of gas contains as much mass as about 10 billion Suns, spans about 300,000 light years, and radiates at a temperature of more than 7 million degrees. This giant gas cloud, which scientists call a "halo," is located in the system known as NGC 6240. As the galaxies - each about the size and shape of our Milky Way -- merge, the gas contained in individual galaxy has been violently stirred up. This caused a baby boom of new stars that has lasted for at least 200 million years. During this burst of stellar birth, some of the most massive stars raced through their evolution and exploded relatively quickly as supernovas. According to researchers, this created new hot gas enriched with important elements -- such as oxygen, neon, and magnesium -- that expanded into and mixed with cooler gas that was already there. In the future, the two spiral galaxies will probably form one young elliptical galaxy over the course of millions of years. It is unclear, however, how much of the hot gas can be retained by this newly formed galaxy, or if it will be lost to surrounding space. Regardless, the collision in NGC 6240 offers the opportunity to witness a relatively nearby version of an event that was common in the early Universe.
[Runtime: 02.06]
(NASA/CXC/J. DePasquale)

Related Chandra Images:

Page 1234567