or just a ‘poof’?
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Sorry, but that’s wrong.
Roche limit applies in a circular orbit, tidal effects are irrelevant in a head on collision.
Famous example of a comet breaking up from entering Jupiter’s roche limit in a highly eccentric orbit (not circular). Spaghettification is also an example of how tidal forces still apply during a head on collision.
Eccentric orbit is still an orbit with tidal forces.
A dead in crash will stretch the sphere, but without angular momentum, it’s just a raindrop.
