Mercury is the smallest planet in our solar system. It is made up of a metal core and a rocky surface that looks a lot like Earth’s moon.
On Mercury, daytime can reach 430 degrees Celsius and -180 degrees Celsius at night.
Mercury is the second densest planet after earth but is 20% smaller than Earth.
Never miss a Nat Geo moment
Join our curious community and you'll have access to some great features!
Personalised content reflecting your interests on the site
Watch exclusive videos before anyone else
Favourite content that you like or want to check out later
Free SMS and Email reminders so you never miss a show
Get notified when content that interests you is published
Share your photos on Snap! that could appear on TV
Share your thoughts and opinions on various matters
Receive a monthly newsletter with loads of great content