Solar System
The Solar System is the gravitationally bound system of the Sun and the masses that orbit it. Most prominently its eight planets, of which Earth is one. The Solar System is an isolated single-star planetary system (not part of a larger star system) within the Milky Way Galaxy.
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- A lightning bolt can be up to five times hotter than the surface of the sun!
- It can rain fish and frogs! This happens when strong winds lift them from water.
- The coldest temperature ever recorded was -89°C in Antarctica!
The system formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed. Creating the Sun and a protoplanetary disc from which the orbiting bodies assembled. The Sun accounts for 99.86% of the Solar System's total mass.
Inside the Sun's core, hydrogen is fused into helium. Releasing energy that is emitted through the Sun's photosphere. This creates the heliosphere and a decreasing how hot or cold gradient across the Solar System.
The next most massive objects of the system are the eight planets. Which by definition dominate the orbits they occupy. Closest to the Sun in order of increasing distance are the rocky planets – Mercury.
Venus, Earth and Mars. These four planets are part of the inner Solar System. Earth and Mars are the only planets that orbit within the Sun's habitable zone.
In which sunlight can keep surface water liquid under atmospheric pressure.
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