Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in ...

Many planetary systems are born in slightly tilted protoplanetary disks, which would explain the misaligned orbits from the ...

Don't forget to look up this month to see the start of a rare, five-planet alignment grace the night sky. Beginning on Friday, the five planets of Mercury, Venus, Mars, Jupiter and Saturn aligned in ...

Planets are not living organisms and, like molecules, do not have to be biological. But at least one is deeply biological in ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...