>>9882579Imma just say this now, I am not formally trained in this. This is just from my current knowledge. If anyone wants to critique my answer, or say it's downright wrong please do so.
> "going relativistic speeds... mass increasing with speed"Okay, so mass does NOT increase when you're moving - your energy does, calculated by the mass times the lorentz factor (which is based on relative speed). More energy does mean stronger gravitational field though. However, looking only at the special relativity part (you say going relativistic speeds [which assumes constant], then increasing with speed [so, non-zero acceleration], please be a little more specific in your wording), a rock going at you at .5c ain't gonna do anything to you because of it's speed alone.
However, any presence of a gravitational field - due to the presence of an object with mass/energy - causes a time dilation (being on the earth vs in its orbit). So technically, since the object is going closer to you, meaning the the gravitational acceleration due to that object on you is gonna have a bigger effect, yeah, a super far away observer is gonna see your clock slow. But it's moving at relativistic speeds, so it aint gonna have any significant impact on you cause it's in the next moment its gone!
> densityAlso, lorentz contraction aint gonna do anything cause the gravitational field has nothing to do with density. Doesn't matter what size or shape or density the object has, as long as the gravitational field is the same, you feel no difference (gauss's law or wtv - the earth's acceleration doesn't change if it were the size of a car). If the object is at a constant speed, it's total energy aint changing, so it's field aint changing (well, ignoring the fact that it's moving towards you, which i already addressed above). If it's accelerating though then the energy is increasing so change in field.
