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If you step back in time, thousands of years ago, people knew about the brightest planets pretty much everywhere. These are Mercury, Venus, Mars, Jupiter and Saturn. And pretty much every culture knew ...

It's been months in the making. Wait, I take that back. It's been years in the making. The last time we witnessed a similar planetary arrangement was back in December 2004. For the next three weeks ...

This article was originally featured on The Conversation. 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 ...

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 ...