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2 days ago · The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere.
4 days ago · Because Earth has a weak gravitational field (by virtue of its size) and warm atmospheric temperatures (due to its proximity to the Sun) compared with the giant planets, it lacks the most common gases in the universe that they possess: hydrogen and helium.
4 days ago · Gravity is responsible for many of the structures in the universe, by creating spheres of hydrogen—where hydrogen fuses under pressure to form stars—and grouping them into galaxies. On Earth, it gives weight to physical objects and causes the tides.
5 days ago · planet, (from Greek planētes, “wanderers”), broadly, any relatively large natural body that revolves in an orbit around the Sun or around some other star and that is not radiating energy from internal nuclear fusion reactions.
- The Editors of Encyclopaedia Britannica
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4 days ago · Newton had formed the hypothesis of an inverse square law of gravity. In terms of Newton's law of Universal Gravity: the gravitational acceleration experienced by a planet is proportional to the gravitational mass of that planet. So: does that mean that Newton had to know the mass of each planet?
1 day ago · Earth's Gravity Also Deforms the Moon. Interestingly, the gravity of the Earth also has hints of deformation over the lunar surface. While this deformation is not as dramatic compared to ocean ...
5 days ago · It is a spherical rocky body, probably with a small metallic core, revolving around Earth in a slightly eccentric orbit at a mean distance of about 384,000 km (238,600 miles). Its equatorial radius is 1,738 km (1,080 miles). Because of the Moon’s small size and mass, its surface gravity is only about one-sixth of Earth’s.
