Mercury

Watch the video Rotation of Mercury to see why the days on Mercury are especially hot.
The unusual rotation of Mercury, when coupled with its elliptical orbit, causes the sun’s motion in the sky to be very strange. Check out the video Solar Motion from Mercury. If you like, you can play with the Day on Mercury Simulator for yourself.
Read 9.5 Mercury to discover more about the closest planet to the Sun, its heavily cratered surface, lack of atmosphere, and unique features like its large metal core and long scarps.
“Messenger” was the first spacecraft to orbit Mercury. It was launched in 2004, reached orbit in 2011, and concluded its mission by crashing into Mercury in 2015. Watch this brief video summary of the mission, its challenges, and achievements.
You would think that it would be easy to send a spacecraft to Mercury, but it’s actually pretty hard to get there. Check out this video explaining The Challenge of Reaching Mercury.
One of the most distinctive features on the surface of Mercury is the presence of scarps. Watch this video comparing Scarps on Earth and Mercury.