SOLUTION: Astronomy: Our galaxy is estimated to be 5.6x10 (19 power) miles across. How long in hours would it take a spaceship to cross the galaxy traveling at 25,000 mph?

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Question 166013This question is from textbook
: Astronomy: Our galaxy is estimated to be 5.6x10 (19 power) miles across. How long in hours would it take a spaceship to cross the galaxy traveling at 25,000 mph? This question is from textbook

Answer by Alan3354(69443) About Me  (Show Source):
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Astronomy: Our galaxy is estimated to be 5.6x10 (19 power) miles across. How long in hours would it take a spaceship to cross the galaxy traveling at 25,000 mph?
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time = distance/speed
t = 5.6E19/2.5E4 hours (a common method of showing scientific notation)
t = (5.6/2.5)E15 hours
t+=+2.24%2A10%5E15+hours
BTW, that's 2.557%2A10%5E11+years
= 255,700,000,000 years (ignoring leap years)
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Pioneer 10 did a fly by of several planets, and left the solar system at 50 miles/second (180,000 mph). It's headed for Barnard's star, one of the closest to us, I think it's 4.3 light years. It will take it 360,000 years to get there.