AST201 Lecture 5

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Astronomy & Astrophysics
Michael Reid

AST201 Lecture 5 Tuesday, January 21, 2014 -unique prediction of General Relativity (not found in Newton’s theory) that light will bend as it passes large object -Gravitational lensing= the bending of light by large objects/bodies -anything with mass curves space -Dark Matter included -Escape Speed -speed needed to escape the gravitational pull of a planet/body -must reach this speed to get out of orbital path -11km/s is the escape speed -certain speed needed to reach a circular orbit -if you compressed the Earth the escape speed would actually go up because the closer you are to an object’s centre of gravity the larger the gravitational pull is -once the escape speed reaches the speed of light nothing can escape -this is what we call a Black Hole -you’ve have bent space-time as much as you can possibly bend it -maybe even torn space-time but we don’t know -from the perspective of someone outside the black hole it would look
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