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The five planets — Mercury, Venus, Mars, Jupiter and Saturn — will be able to be seen by the naked eye in the early morning. In addition, the planets will be seen in their proper order from the Sun.

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 ...

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 ...

The official number of exoplanets—planets outside our solar system—tracked by NASA has reached 6,000. Confirmed planets are ...