AST201H1 Chapter Notes - Chapter 18.3-19.4: Rotating Black Hole, Gravitational Redshift, Event Horizon

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Michael Reid

Document Summary

Section 18. 3 black holes: gravity"s ultimate victory. They then said that light from this object would behave like a rock thrown up it would raise, slow down, and then fall down. Einstein"s general theory posited that light within a black hole can never escape when gravity was big enough (hence black ). If you enter a black hole, you leave the region of the universe observable by telescope and you can never return. Event horizon: the boundary between the inside of a black hole and the universe outside: it is the boundary at which the escape velocity = c past that point, nothing can escape. The velocity needed to escape a black hole"s gravity depends on the distance to its center, which is the same for every point on the event horizon. Spacetime: the 4-d combination of space and time (which are not separate and distinct).