This invisible boundary is known as the heliosphere. It's the endpoint beyond which our Sun does not have any reach or power.

Some are no bigger than pebbles, while others stretch for miles, silently orbiting the sun in the asteroid belt or zipping ...

The solar system holds extraordinary wonders, from Voyager 1’s historic journey into interstellar space after traveling billions of miles, to Uranus spinning on its side with extreme seasons lasting ...

This quiz invites you to chase comets through time and space, from ancient omens to modern scientific marvels.

I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, astronomers detected a strange, fast-moving object racing toward the Sun. Named ...