Once you have detected the possible presence of a black
hole, what data do you need...
Once you have detected the possible presence of a black
hole, what data do you need to prove that it is indeed a black hole
and not a very massive star cluster?
Multiple choice: The presence of a black hole in a galaxy core
can be inferred from (a) the total mass of the galaxy; (b) the
speeds of stars near the core; (c) the color of the galaxy; (d) the
distance of the galaxy from the Milky Way Galaxy; or (e) the
diminished brightness of starlight in the galaxy core, relative to
surrounding areas.
Multiple choice: Which one of the following statements about
black holes is false? (a) Inside a black...
Black holes
Q: what is escape speed?
Q: what is a black hole? Size? What is the event horizon?
Q: How to “see” black holes if they are black? Evidence for
stellar mass black holes? Supermassive black holes?
What is the mass of the black hole at the center of our galaxy
if a star orbiting 0.0025 pc away has an orbital period of 7 years?
Be careful of units here.
Possible Duplicate:
Black hole formation as seen by a distant observer
Given that matter can never cross the event horizon of a black
hole (from an external observer point of view), if a black hole is
"fed" with a large amount of matter then the new matter will
eventually become extremely compressed, and presumably would be
compressed below its Schwarzchild radius.
Would secondary black holes eventually form near the original
black hole?
As an alternative one could also imagine that...
How massive would a black hole have to be in order for it to
evaporate due to Hawking radiation in only one year? How big is
that mass compared to some object with which you are familiar? (On
the surface of the Earth, 1 kg ? 2.2 lb.)
1. What is the evidence for a black hole at the center of the
Milky Way? How does this compare to stellar size blackholes? How
can these smaller blackholes be observed?
2. What is Hubble’s Law? In what situations does Hubble’s Law
not apply?
3. What is the cosmic microwave background? What is its
origin?
What is the Schwarzschild radius of the black
hole at the center of the Milky Way? What
is the ratio of
the gravitational acceleration the Sun feels from this black hole
to the
gravitational
acceleration the Sun feels from the entire Milky Way? Comment on
the
gravitational
significance the black hole has on our Solar System.
Describe, in detail, what would happen if you fell into
a black hole, from both your perspective, and the perspective of
someone who is watching you fall in. You should include specific
effects, including effects on space, time, and what you would
see.