The basic numbers are:
Radius of Earth 6370km
Radius of Moon 1740km
Earth-moon distance 384000km and
Radius of Jupiter 71500km
So the scale factor is 71500/6370 = 11.22
The radius of the moon scaled is 1740×11.22 = 19500 km, and its distance becomes 384000×11.22 = 4310000 km
For comparison, Neptune has a radius of 24600 km and a distance from Jupiter of ...
To achieve thermonuclear fusion you need high temperatures and high density. If you were able (by magic) to compress and heat the core of Jupiter then fusion would occur.
But there is no mechanism that can cause Jupiter to increase it's temperature and density like this. In the core of a proto-star, gravity will provide the force needed to increase the ...
I think this question might trigger more an open-ended discussion, than a definitive answer, but let me try my take on it.
Is it more likely that one of these collided with Jupiter itself at the head-on angle needed for the core-warping collision?
In order to collide, a co-orbital configuration is more favourable than a orbit-crossing encounter at ...