The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

Mercury joins the night sky to complete a 7-planet alignment just after sunset for the end of February. Saturn leaves our ...

Seven-planet great alignments are, of course, the rarest of all. These alignments aren't the neat planetary queues you see in ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

An illustration of the solar system on June 3, 2024. Right now, if you look to the sky in the early evening (the first few ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...