A swarm of galaxies called the Bullet Cluster is the biggest, best natural laboratory for studying dark matter that astronomers have ever seen ...

3I/ATLAS, an interstellar object currently zipping through the solar system, is capturing the attention of astronomers, the public and even most of our deep space assets. Its hyperbolic orbit tells us ...

TARS, named after the robot from the 2014 film "Interstellar," could potentially be a way to travel to other stars. TARS requires no fusion reactors, no gigawatt laser — and not even a chemical rocket ...