black hole vs white hole

 A black hole is a real cosmic object where gravity traps everything (even light), while a white hole is a purely theoretical opposite that only ejects matter and lets nothing in. [1, 2, 3]

Black Hole

Definition: A region of space with mass packed so densely that its gravitational pull prevents anything—including light—from escaping past its boundary.
Event Horizon: A point of no return; once you cross inward, you cannot get out.
Existence: Proven to exist through direct imaging, gravitational waves, and stellar observations.
Formation: Forms when massive stars collapse at the end of their life cycles in a supernova. [1, 2, 3]

White Hole

Definition: A hypothetical region of spacetime that acts as the reverse of a black hole—it only expelsmatter and light.
Event Horizon: A boundary of no admission; nothing from the outside universe can ever cross inward.
Existence: Purely theoretical and mathematical; no observational proof exists.
Theories: Some physicists propose they could be the final "rebound" stage of dying black holes or the other side of a wormhole. [1, 2, 3, 4, 5, 6]