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Mass & Velocity .
Yes. Clearly the Earth orbits around the Earth.
Nitrogen levels and surface radiation.
The Earth will always rotate, thus giving us days. The Earth will always orbit around the Sun, thus giving us seasons. The Earth will also always keep the moon in orbit with the Earth by the Earth's gravitational pull.
Gravity, orbit, and Chuck Norris.
The earth will keep revolving around the sun until the sun dies out or earth is hit by a really big asteroid and knocks it out if its orbit.
the earth's gravitational pull is just strong enought to keep it in orbit, but not strong enought, at that distance, to pull it back to earth
Yes; the sun's gravity keeps the Earth orbiting around it.
centripetal force
The gravitational forces between the Earth and Moon keep things together. The moon is slowly getting farther from Earth, however. Ancient humans would have seen a much larger moon in the night sky...
You're half-way there. The mutual, equal gravitational forces between the Earth and Sun maintain the Earth's stable, closed, elliptical orbit around the Earth/Sun common center of mass.
You're half-way there. The mutual, equal gravitational forces between the Earth and Sun maintain the Earth's stable, closed, elliptical orbit around the Earth/Sun common center of mass.