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23 Nov 2019
An astronomiclal unit (AU) is equal to the average distance fromthe Earth to the Sun, about 92.9 x 10^6 mi. A parsec (pc) is thedistance at which 1 AU would subtend an angle of exactly 1 secondof arc. A light-year (ly) is the distance that light, travelingthrough a vacuum with a speed of 186,000 mi/s, would cover in 1.0year.
1. Calculate whether the setting sun floats or sinks into thePacific Ocean each night.
2. Use the size of the Universe, assume 200 billion galazies, ourown is average, and 200 billion stars per galaxy, our Sun isaverage, to calculate the density of the known Universe.
An astronomiclal unit (AU) is equal to the average distance fromthe Earth to the Sun, about 92.9 x 10^6 mi. A parsec (pc) is thedistance at which 1 AU would subtend an angle of exactly 1 secondof arc. A light-year (ly) is the distance that light, travelingthrough a vacuum with a speed of 186,000 mi/s, would cover in 1.0year.
1. Calculate whether the setting sun floats or sinks into thePacific Ocean each night.
2. Use the size of the Universe, assume 200 billion galazies, ourown is average, and 200 billion stars per galaxy, our Sun isaverage, to calculate the density of the known Universe.
