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Well, the simple answer is gravity is pulling them towards it. However, I don't think that is a good enough explanation. The leading idea now is that mass causes space-time to curve. What is says is that enourmously heavy objects (like the sun) actually bend space and time around it, drawing objects in. Kinda like those things at shopping malls where you drop in a penny, and it rides around the edge until falling in. Same basic principle. This also works for black holes, which is a "hole" in space. Just like water flowing towads a drain, everything curves around it. therefore, space itself would have to be curved. Gravity, I think, is actually themeasure of how much space is curved. In fact, here's an experiment: * Put Basketball on the center of a table. The table is space, and the basketball is the sun. * Roll a grape by the basketball. The grape represents a planet. Notice how, when you roll it, the grape continues past without curving. If this were accurate, the grape should have rolled toward the ball. * Now, try the same trick with the basketball at the center of a large bowl. The grape should curve right into it, just like it would in space. that would mean that space was actually curved. Of course, all of this is theory, but it makes a lot of sense when you think about it.

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16y ago

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