Are they stars? Are they planets? Or are they neither? Some rogue planetary mass objects that wander the cosmos alone could ...

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar ...

Mars is covered in a fine dust that’s rich in iron oxides. You might know these compounds better as rust, the same stuff that forms when you leave an old bicycle out in the rain too long. On Earth, ...

Play the USA TODAY Daily Crossword Puzzle. Here's what to know about the upcoming skyward spectacle. According to the Science Alert website, "It's not uncommon for a few planets to be on the same ...