AST112 EXAM 3
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What is a black hole?
PRINCIPLE OF EQUIVALENCE
GRAVITY BENDS LIGHT
PROOF OF THE GENERAL RELATIVITY
SOLAR ECLIPSE OF 1919
CURVATURE OF SPACETIME
WHAT HAPPENS WHEN SPACE IS WARPED SO MUCH THAT NOT EVEN LIGHT CAN ESCAPE?
BLACK HOLES HAVE MASS, ANGULAR MOMENTUM AND ELECTRICAL CHARGE
: AT A DISTANCE A BLACK HOLE EXERTS THE SAME GRAVITATIONAL FORCE SUCH AS ANY OTHER OBJECT
-Black holes SPIN RAPIDLY AS THEY FORM.Their fast rotation distorts space and time near the boundary of the blackhole.
BLACK HOLE DIAGRAM
EXPLORING THE SWARTZCHILD RADIUS
-THE SIZE OF A BLACK HOLE DEPENDS ON MASS
- SIZE OF A BLACK HOLE IS GIVEN BY A SIMPLE FORMULA
ANY OBJECT WITH A MASS CAN BECOME A BLACK HOLE IF IT CAN BE CRUSHED TO A SMALL ENOUGH RADIUS
Falling into a Black Hole
: you can feel the gravity is stronger on your feet than on your head.
It feels like you are being stretched!
As you cross the event horizon, a distant observer sees you TURN redder.
time slows down (your clocks runslower and slower…) finally…you ARE A frozen image as
you cross the event horizon
What to YOU see ?
…the black void is suddenly replaced by an unimaginable array of views.
You see outwards – light falls into the black hole butdoesn’t get out
You are lost to our universe forever.And within a few seconds, you are swept into the massive singularity at the center of the black hole and crushed into oblivion!
WHAT YOU SEE... Unless….
AST112 EXAM 3
black holes and general relativity