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Upload to Facebook Neptune was the first planet to have its existence predicted by calculations before it was actually seen by a telescope. -
Upload to Facebook Each day, up to 4 billion meteoroids fall to Earth. -
Upload to Facebook There are an estimated 100 billion galaxies in the universe. -
Upload to Facebook When the moon is directly overhead, we weigh slightly less. -
Upload to Facebook Mars' gravitational pull is only 37% that of Earth's - One would be able to jump about three times higher on Mars than on Earth.
