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NASA's Chandra X-ray Observatory captures the first-ever X-ray of an exoplanet passing in front of its parent star in a system that is 63 light-years from Earth.
An X-ray telescope designed to hunt for black holes takes a look at the sun and helps NASA deliver an intense portrait of our closest star.
One of the most powerful black holes in the observable universe has been revealed by NASA's Chandra X-Ray Observatory.
Its root cause still undetermined, a huge X-ray flare from the Milky Way's center has made NASA scientists sit up and take notice.
The discovery of a new unusually bright dead star leads astronomers to question assumptions about a type of cosmic radiation -- and pulsars themselves.
While we typically think of black holes as death pits from which nothing can escape, recent studies suggest black holes play a pivotal role in creating stars. Could one have created our sun?
Astronomers use the Very Large Telescope to reveal a space drama involving two unique stars in the Ara constellation.
An Austrian auction house will soon take bids on a camera it claims is the only handheld to come home from an Apollo mission.
NASA's Hubble telescope has taken its deepest ever picture of a cluster of galaxies, revealing some of the faintest and youngest galaxies ever detected.
Astronomers at the Chandra X-ray Observatory explain why the black hole at the heart of the Milky Way galaxy doesn't consume everything in sight.