That's not enough to explain an eliptical orbit. If a comet comes in so close to the sun that it picks up the speed that it does, it doesn't make any sense to me that the comet could escape that gravitational pull. It should keep spiraling in and crash and burn... it shouldn't suddenly get flung away the way it does. Or it should sail past the sun, and not get sucked into an orbit at all. As it gets closer to the sun, it goes faster. The faster it goes, the more likely it is to break away from the orbit. So why does it not break away from the orbit at it's closest point?
I have to think this out.
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