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Einstein's theory of relativity saysthat the reason planets orbit mass curves spacetime, and curves space time tells masshow to movie, no gravity. Andin this case thecurves is a elliptical orbit. Because gravity also curves light.Gravitational lensing is when massbends lightBlack HolesWe discover Black Holes thanksto binary systemsAnyobject with escape velocity > c is a black hole<insert equation>Escape VelocitySince c is the speed limit forthe universe, set escape velocity to c, solve for r. This isthe Schwarzschild Radius:<insert equation>If the Sunsuddenlycollapsed into a black hole how wouldthis effect Earth's Orbit?1.Earth goes to much wider orbit2.Earth does the death spiral all the way in3.No more orbit: Earth and other planets leave solar system.4.People farm animal and other small thingswould literally get sucked right offearth5.It wouldbe dark(b/cmass of sun has notchanges therefore orbit wouldnotchange/gravitational pull)

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