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twanvl | 5 years ago

> Fun fact: it requires more delta-V to hit the Sun than it does to leave the Solar System.

Isn't that the delta-v needed to reach a stable orbit? That is, to slow down and counteract all the kinetic energy you gained from the sun's gravity. To just hit the sun (with high velocity) you wouldn't need to do that.

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me_me_me|5 years ago

Yes, moving towards sun/ any body that is inbeteen sun and earth you actually 'slowing down' (after reaching earth's orbit). When you reach zero V relative to sun you will just drop to its surface (same with any other planet).

Anything on the outside you 'speedup'.

That's why its called delta-V as its relative change in V needed to get somewhere. And its independent of size, type of craft etc.