Astronomers have spotted only three objects known to have come from outside our solar system. The newest, called 3I/ATLAS, is ...

A respected Harvard astrophysicist has shared new claims about the mysterious interstellar object in our Solar System, saying there are signs it is not an ordinary comet.

Though the days are fast ticking by, that success is far from assured. DART is the first-ever test of what NASA calls a kinetic impactor—a projectile intent on transferring its momentum to an asteroid ...