What would happen if we released a helium balloon from the Moon's surface?
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If you released a helium balloon from the Moon’s surface, it would fall to the ground. The Moon has no atmosphere, so there is no air for the balloon to float on. The balloon would be pulled down by the Moon’s gravity, just like anything else on the Moon.
The balloon would fall slowly, because the Moon’s gravity is much weaker than Earth’s gravity. The Moon’s gravity is about one sixth as strong as Earth’s gravity. This means that a balloon would fall about six times slower on the Moon than it would on Earth.
The balloon would eventually reach the ground and pop. The helium would escape into the vacuum of space.