Even though Andromeda and our galaxy contain hundreds of billions of stars, they are both such vast galaxies that the chance of any two stars colliding is extremely low.
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Morningfox say: How much does he think the change would be? Gravity on Earth does change, but the major change comes from the Earth spinning around under the moon. This change happens on approximately daily basis, not yearly. In other words, the local gravity is different when the moon is on the horizon, compared to when it is directly overhead, or on the direct opposite side of the Earth. Some very sensitive science experiments have to take this into account.
The movement of the moon away from the Earth has been directly measured, it is currently 3.82 cm per year. If this rate was constant (it is not), then in one million years the moon would have moved 38.2 kilometers. That's a tiny fraction of the average distance, which is 384,399 km.
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PhotonX say: Your friend is wrong. The difference between lunar apogee and perigee, the closest and farthest points in its orbit around Earth, is around 40,000 kilometers. I'm betting your foolish friend can't tell the difference between those two events; he's foolish to think he could perceive the difference of a few centimeters.
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CarolOklaNola say: The Moon really is moving away from Earth by 3.8 centimeters I and 5/8 inches every year because of the conservation of angular momentum, but Earth's rotation rate is slowing down because of conservation of angular momentum.
Earth's gravity is NOT changing noticeably, although it IS gaining mass EVERY YEAR. The Moon moving away from Earth is NOT going change Earth's acceleration of gravity. Your friend is wrong. Your friend does not understand the basic laws of physics.. That's OK. You both have brains, so you both can and should learn new things NOW. Pay attention in school in math and science class AND English class. , EVERY class you take. Yes, you will both have a worst subject. for me it was math., but I got over my fear and hatred of math by turning it into a personal challenge.
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Sean say: He is wrong. The moon moving away at that rate has no noticeable affect. In fact the orbits of the moon around the Earth and the Earth around the sun are not perfectly round. At different times, each is closer to the other on the range of kilometers difference. For example, On January 1, we might be 200 kilometers closer to the sun than we are on July 1.
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dylan say: He's wrong
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