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Europa (Jupiter II)

Europa is one of 79 and the 4th largest moon of Jupiter. It was discovered by Simon Marius in 1609, who named it "Europa", after a princess from Greek Mythology. Its diameter is 3121.6km, just a bit smaller than Earth's moon. It takes roughly 3.5 days for Europa to orbit Jupiter. Europa's distance from Jupiter is about 670.900km.  Scientists believe that Europa has an iron core and an atmosphere (mostly oxygen). The surface is smooth and icy. Under [...]

The Moon (Luna)

The Moon(or Luna) is Earth's only natural satellite. It was created as a result of collision between Earth and Mars-sized protoplanet Teia 4.53 billion years ago. It's 384399 km away from Earth and moves away from our planet at a rate of 3.8 cm per year. The Moon's gravity is 1/6 of Earth's and it has no atmosphere. In 2009 NASA announced that they have found water on the moon. The Moon's cycle is 29 days, 12 hours, [...]

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