Galaxies. Spring 2009. Announcements. Current moon phase: waxing crescent. Planetarium trip Monday , May 4th. Show starts at 7:30 sharp. Location: http://www.astro.umass.edu/~salberts/astro103/tuesday/ Any transportation issues? No class on Tuesday, May 5th.
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Format: 20 questions; identify const.,
short answer, and multiple choice
NGC 4594: “Sombrero Galaxy”
Large Magellanic Cloud
G = Grav. Constant
= 6.67 x 10-11 m3 kg-1 s-2
m = mass (kg)
c = speed of light
= 3.0 x 108 m s-1
3 km (1.8 miles)
1 x 10-25 meters
(10 billion times smaller than an electron)
1148 TeV = 1.84 x 10-4 Joules
mBH = E/c^2 = 2.04 x 10-21 kg
Black Hole Evaporation Timescale:
tev = 8.41 x 10-17 [mBH (kg)]3 sec
Black hole would evaporate in 1 x 10-78 sec!
Not enough to account for most of the dark matter.