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what would happen if a rogue, earth-size planet ran straight into the sun? anything interesting?
(moist.catsweat.com)
this post was submitted on 14 Aug 2024
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That's not how relativity works. Moving quickly relative to what? The planet might be moving slow relative to the local objects where it began its movement, but the local objects at it's origination point were also moving at some speed, and the group of objects that the local group was in were also moving at some speed, etc etc. And likewise our sun isn't stationary, it's also moving relative to everything else, so you could just as easily say the planet is stationary but our sun was moving very quickly toward the stationary planet. There is no thing as an absolute slow/fast when you're talking about bodies in space. There are tons of ways that a planet sized object could have a fraction-of-c speed relative to our sun.
And there are "rogue planets" out there. They aren't held into any orbital system, they're just flying free in empty space. So that part is true as well. It would be very unlikely that some of them AREN'T moving extremely quickly relative to the sun.
https://en.m.wikipedia.org/wiki/Rogue_planet
Ok, let's see:
The parent posted didn't mention relativity. Just that a planet was moving at a fraction of c, which is a specific amount (let's say, 10,000 km/s)
Since the parent poster is talking about the sun, and how such a planet with such velocity could affect it (the sun), then it's easy to assume that the planet is moving quickly relative to the sun itself.
So, the poster's question is equivalent to saying "if a feather collides with my body, it may do nothing. But what if the feather is super-super-super fast?! What would it do to my body??"