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Has a diameter of a little over 3,000 miles.NASA launched the MESSENGER probe in 2004 to learn all about Mercury since we don’t really know much about it. It is slightly smaller than Earth’s moon and is extremely hot. The first planet in our solar system is Mercury. Planets in order of distance from the Sun: Planet Let’s go over them, but first, here’s a quick rundown of each planet in order of size and distance from the sun. In our system, we have 4 terrestrial planets, 4 gas giants, and a mysterious 9th planet. Our solar system revolves around the sun, hence the name solar system. – Michio Kaku Our Solar System’s Planets in Order CNN studios would probably be a gigantic crater it if wasn’t for Jupiter. We would suffer from asteroid impacts every day. Without Jupiter cleaning out the early solar system, the Earth would be pock-marked with meteor collisions. Check out this guide to learn all about the planets, their size, and their order in the solar system. Our solar system is usually gone over in elementary school, so you might just need a refresher course about the planets in order in our solar system. Most people have at least heard about our solar system and the planets in it.
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The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and finally the dwarf planet Pluto.