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Mercury
It's cute, it's cuddly, it's the closest planet to our Sun and it's a bit self-concious about its size. Yay Mercury! Guess what?
- Takes less than three months to orbit the Sun.
- It's not as hot as Venus.
- It is the smallest planet.
Because Mercury is so close to the Sun it will never be very far away from it in the sky. The few times you will see Mercury is within a couple of hours before sunrise or after sunset. Let's learn more:
Distance from Sun: | |
---|---|
Closest: | 46,000,000 km (0.0 AU) |
Farthest: | 70,000,000 km (0.0 AU) |
Size: | |
Volume: | 6.083x1010 km3 |
Diameter: | 4,880 km |
Mass: | 3.30x1023 kg |
Motion: | |
Year: | 88 E Days |
Day: | 58.6 E Days |
Other: | |
Gravity: | .38 of Earth's |
Temperature: | -168°C to 427°C |
Mercury gets its name from the god Mercury. He is known as the swift messenger which seems appropriate since Mercury moves around the sun faster than any other planet. Only two probes have been sent to Mercury.
Missions to Mercury (Needs updating)
Even though Mercury is close we've only sent two probes to it:
# | Name | Launch Date | Arrival Date | Mission End Date |
---|---|---|---|---|
1 | Mariner 10 | 10/03/1973 | 03/29/1974 | 03/16/1975 |
2 | MeSSEnGeR | 08/04/2004 | 03/18/2011 | In Progress |
Mariner 10
Launched November 3rd, 1973, the Mariner 10 probe was to fly past both Venus and Mercury. The Venus Flyby took place on February 5th, 1974 and was meant to test some of the data recieved on previous Mariner missions (2 & 5). After Venus it was on to Mars where it made flybys on March 29th, 1974; September 21st, 1974; & March 16th, 1975. Taking over 2,800 photos the craft mapped about 45% of the planet's surface. Learn more on our Mariner 10 page.
MeSSEnGeR
On August 4th, 2004 the U.S. launched a probe to gather more information about this "elusive planet." The probe has already gone around the Solar System and passed Earth, Venus, Venus again and Mercury three times. It has now slowed down enough that it will begin to orbit Mercury on March 18th, 2011. Learn more on our Messenger Page.
Gallery
It is the least photographed planet. Only one mission photograped less than half of the planet's surface.














