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The clump of quasars stretches 4 billion light-years from end to end.

NGC 6872 is more than five times wider than our own Milky Way.

A new estimate puts our galaxy's mass at 500 trillion to 1 quadrillion times that of the sun.

The structure is more than 300 light-years long but just 1 or 2 light-years wide.

The spectacular outburst is 10 times brighter than the biggest supernova.

Astronomers have spotted comets in six more alien star systems, bringing the tally to 10.

A new study suggests planets are extremely common throughout the galaxy.

Baby planets pull gas and dust toward their parent star, helping young suns to continue in their evolution.

Some enormous clusters manage to stay young at heart, a new study finds.

The ratio of the mass of a proton to the mass of an electron hasn't changed.

A galaxy that may be farther than any previously seen is shedding light on the earliest years of the universe.

Scientists have solved a befuddling mystery about the X-ray light coming from the sun.

Astronomers have put together an amazing new image of elliptical galaxy Hercules A.

Scientists will report on a population of primitive galaxies that formed more than 13 billion years ago.

Many binary systems spread across vast distances could host a third star in their center.