it's so weird how they use gravity in astronomy books like Hubble. there should be other words for different gravity. I firmly don't think gravitons exist, but when I saw a video about how that if an electron of an atom is about a mile away if the nucleus is (as reference) the size of a ping pong ball.
eather way, I don't think the gravity in this image is right, I think the planet should be separating at least a little bit. other then that, there is no planet crusher nebula, there are only things that are big, that would make flame like appearance to a celestial 'car crash'
good job though! physics and gravity are hard to manipulate in an image. those are the only 2 things that COULD be wrong in this image. something like this could possibly be seen from a telescope!