Astronomers have long sought strong evidence that Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, is producing a jet of high-energy particles. Finally they have found it, in new results from NASA's Chandra X-ray Observatory and the National Science Foundation's Very Large Array (VLA) radio telescope.
Astronomers using NASA's Hubble Space Telescope and Chandra X-ray Observatory and telescopes on the ground may have found the most crowded galaxy in our part of the universe.
For the first time since exoplanets, or planets around stars other than the sun, were discovered almost 20 years ago, X-ray observations have detected an exoplanet passing in front of its parent star.
Magnetars – the dense remains of dead stars that erupt sporadically with bursts of high-energy radiation - are some of the most extreme objects known in the Universe.
Astronomers at NASA have used the Chandra X-Ray Observatory to conduct a detailed study of an enormous cloud of hot gas enveloping two large, colliding galaxies.
New data from NASA's Chandra X-ray Observatory indicates that a highly distorted supernova remnant may contain the most recent black hole formed in our Milky Way galaxy.
Our Milky Way Galaxy is surrounded by an enormous halo of hot gas hundreds of thousands of light years across, and with as much mass as all the stars in the galaxy.
A population of old, volatile stellar black holes has been discovered, following an 'extraordinary outburst' from one located in a nearby galaxy.
A black hole discovered by NASA's Chandra X-ray Observatory is generating winds blowing at 20 million miles per hour - about three percent of the speed of light.
The supermassive black hole known as Sagittarius A has been observed emitting X-ray flares, lasting a few hours, about once a day.
Astronomers say they've detected the largest galaxy yet seen in the distant universe, more than seven billion light years from Earth.
In an X-ray image looking further into the past than ever before, NASA astronomers have discovered that massive black holes were common in the early universe and grew much more aggressively than previously thought.
Astronomers are poring over data from what they say is one of the most puzzling cosmic blasts ever observed.
Move over CERN: a pattern of X-ray 'stripes' in the remains of a supernova may provide the first direct evidence that supernovae can accelerate particles to energies a hundred times higher than the Large Ladron Collider.
NASA's Chandra X-ray Observatory has for the first time discovered a superfluid - a weird, friction-free state of matter - at the core of a neutron star.
A new study from NASA's Chandra X-ray Observatory could tell us more about how black holes are created - and about the future of the black hole at the heart of our own galaxy.
NASA's Chandra telescope has found evidence of the youngest black hole in our area of the universe - just 30 years old at the point of observation.
An astronomer says he's caught a star in the act of chewing up a companion and spitting out a second generation of exoplanets.
It's so, so annoying when stuff gets mislaid, so it must be a great relief to astronomers to be able to say they've probably found the nearby universe's missing matter.