In Space No One Can Hear You Cum

"

A black hole is a region of spacetime whose gravitational field is so strong that nothing which enters it, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics.   This one is literally a "Black Hole"

   

Another "Black Hole", this one with a white dwarf orbiting it. "Don't get sucked in, poor little white dwarf."

   

 Here we have a White Hole, until very recently unknown to exist in actual space. Until a few months ago it was thought to exist only in the minds of nerdy Star Trek geeks who couldn't get a girlfriend.