When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A rare but faint interstellar visitor from beyond our solar system is racing toward the sun — and ...

We’ve found lots of “habitable” worlds but we don’t know what factors are needed for life. There are lots of reasons to search for planets around other stars—exoplanets. A big one is to find other ...

The workings of our solar system are roughly the same now as they have been for millions of years. Moons circle their planets, the planets circle the sun, the sun’s magnetic fields and sunspots wax ...