ECON 240 Midterm: Short Answer Study Guide - ASTRO 102
10 May 2016
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Until about a decade ago, astronomers tried to address the question of the expected slowing of the expansion by comparing the recession velocities of remote galaxes to those more nearby. More recently, we used supernovae as distance indicators in remote galaxies. Describe in a few simple words what exactly the astronomers observe and measure. What surprising thing have we learned, what are the implications for the future expansion of the universe: supernovae have some useful qualities for this: The discovery from supernovae is tied in an unexpected way to einstein"s blunder. What path does light take near a black hole: the schwarzschild radius is the size to which a massive object would have to be compressed to before gravity would irreversibly take over, for earth it"s about 1cm. For the sun, it is about 3km: light takes a parabolic path near a black hole (it never comes to a standstill, but rather rainbows")
