Grains of stardust - particles left behind by star explosions - in an Australian meteorite are now the oldest known material on Earth. A new study suggests this stardust came to be long before our sun ever existed.

The Gaia-Enceladus dwarf galaxy slammed into our Milky Way 11.5 billion years ago. It added the mass of 50 billion suns to the Milky Way. Grand names and big numbers! Now new knowledge of this collision comes from a single bright star visible in Southern Hemisphere skies.

Hyperbolic comets fly through our solar system at high speed before heading out to interstellar space, never to return. A new study from astronomers in Japan identifies 2 hyperbolic comets that likely originated outside our solar system.

In recent years, astronomers have pondered the search for biosignatures, or signs of life, in the atmospheres of distant exoplanets. Will the James Webb Space Telescope - due to launch in 2021 - be able to detect them? A new technique says yes.

Betelgeuse has dimmed recently, prompting some to wonder if it's about to explode. An explosion might trigger a gravitational wave burst. Betelgeuse is still there. The nearby gravitational wave burst probably means nothing for this star. Still ... 

It's difficult to see objects whose orbits are within that of Venus, because those objects always stay near the sun in our sky. Now, though, astronomers have spotted one!

A new NASA video combines visible, infrared and X-ray views of the famous Crab Nebula, a star that exploded into view in our sky 1,000 years ago.

This image is part of a wider system of depressions that spiral outward from the very center of Mars' north pole. Seen in context, you can see rippling troughs that curve and bend and slice outwards from the pole counterclockwise.

The Hubble Telescope released this glorious image of the spiral galaxy UGC 2885 on January 6. This image was made in part as a tribute to dark matter pioneer Vera Rubin.

They found massive black holes in 13 dwarf galaxies, which are now among the smallest galaxies known to host such massive black holes. In roughly half the galaxies, the black hole isn't at the galactic center, but instead is "wandering."