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The Solar System formed approximately 4.6 billion years ago from a collapsing cloud of gas and dust. The Sun contains 99.86% of the solar system's mass. The 8 planets divide into terrestrial (Mercury, Venus, Earth, Mars — rocky, dense, inner) and gas/ice giants (Jupiter, Saturn — gas; Uranus, Neptune — ice). Pluto was reclassified as a dwarf planet in 2006 — one of 5 recognized dwarf planets.
Key facts: Jupiter is the largest planet (318 Earth masses) and its Great Red Spot (a storm larger than Earth) has been observed for 350+ years; Saturn's rings are primarily ice particles, 100m thick but extending 282,000 km; Mars has the tallest volcano in the Solar System (Olympus Mons, 21 km — 2.5x Everest) and the longest canyon (Valles Marineris, 4,000 km); Venus is the hottest planet (465°C, despite not being closest to the Sun — thick CO₂ atmosphere greenhouse effect); Titan (Saturn's moon) has liquid methane lakes.
# Top 10 solar system facts
- 1Sun 99.86% of mass
- 2Jupiter's Great Red Spot (350+ years)
- 3Saturn's rings
- 4Mars Olympus Mons
- 5Venus hottest planet
- 6Europa (possible subsurface ocean)
- 7Titan methane lakes
- 8asteroid belt
- 9Kuiper Belt
- 10Oort Cloud
Fascinating Facts
- ◆Saturn's rings are only 100 meters thick but extend 282,000 km — if the rings were a piece of paper, their width would be 600,000 sheets of paper wide but only 1 sheet thick
- ◆Jupiter's Great Red Spot (a storm larger than Earth) has been continuously observed since 1665 — 360+ years of the same storm, though it is gradually shrinking
- ◆Venus is hotter than Mercury despite being twice as far from the Sun — its thick CO₂ atmosphere creates such an extreme greenhouse effect that lead would melt on its surface
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