Posted: May 09, 2017 6:18 am
by crank
Cito di Pense wrote:
crank wrote:What is the mass of Jupiter at these speeds? It's going to be many, maybe hundreds of times Jupiter's 'rest mass' isn't it? I'm too lazy and stupid to try to grab an equation and assume I got the right one. It's going to be one of those 1/[1-(v/c)2] things I think, my brain function has declined too for me to try to get it right. I know I've heard of cosmic rays that have had the mass of something like a tennis ball I think, and that's way more by many orders of magnitude than 'hundreds of times' that I just said.

No: What would accelerate something the size and density of Jupiter to such a velocity without its being disrupted by tidal stresses between the near and far sides of the direction of the force? If it was something the mass of Jupiter with a density that would allow it not to be tidally disrupted, its collision cross-section would be tiny, and you can recalculate your 'effects'. A neutron star with one solar mass is about 10 km across (order of magnitude, don't quibble).

What's the maximum force that would accelerate Jupiter to such a velocity without disruption, and how long would it take to achieve the velocity you're interested in?

And there isn't a time frame involved, it could be a jupiter accelerated over many many years/centuries/millennia kind of thing