88 days
365 days
2 years
98 days
Mercury is the closest planet to the Sun with an average distance of 0.387 AU or 5.79 x 107 km. It takes 88 Earth days to orbit the Sun, and rotates very slowly at a rate of 1 rotation every 58.7 Earth days. Its mass is 3.3 x 1023 kg or 0.055 Earth masses.
- Mercury doesn’t have any moons.
- Mercury is a terrestrial planet. It is small and rocky.
- Mercury is the smallest planet in our solar system. It’s just a little bigger than Earth’s Moon.
- It is the closest planet to the Sun, but it’s actually not the hottest. Venus is hotter. Venus’ thick atmosphere traps heat creating a runaway greenhouse effect – making it the hottest planet in our solar system with surface temperatures hot enough to melt lead. The greenhouse effect makes Venus roughly 700°F (390°C) hotter than it would be without a greenhouse effect.
- Mercury has been known since ancient times because it can be seen without advanced telescopes.
- Because it is so close to the Sun, Mercury is hard to study from Earth. No people have ever gone to Mercury, but two robotic spacecraft have visited. The spacecraft were called Mariner 10 and MESSENGER.
- MESSENGER mapped Mercury by taking pictures of the planet’s surface, including some areas that had not been seen before. It also collected information about what the surface and insides of Mercury are made of.
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Related MCQs
- Galileo’s most famous invention was? (CSS 2015 Current Affairs Paper)
- Telescope
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