SOLUTION: The Great Galaxy in Andromeda (also known as the Andromeda Galaxy or M31) is about 2.5 million light years from Earth. When we look at this galaxy today, we see light that has been

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: The Great Galaxy in Andromeda (also known as the Andromeda Galaxy or M31) is about 2.5 million light years from Earth. When we look at this galaxy today, we see light that has been      Log On


   

Question 181992: The Great Galaxy in Andromeda (also known as the Andromeda Galaxy or M31) is about 2.5 million light years from Earth. When we look at this galaxy today, we see light that has been traveling through space for 2.5 million years; i.e. when we look at the Andromeda Galaxy, we are seeing it as it was about 2.5 million years ago! Think about this, we are looking back in time.

1 light year is the distance that light travels in 1 year. Speed of light is 300,000 kilometers/second, find the distance that light travels from the Andromeda Galaxy to Earth in kilometers and express it in scientific notation.



Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Profound!
Andromeda is 2.5X10%5E6 light-years from earth.
The speed of light is: c+=+3X10%5E5km/sec.
One light-year is (60%2A60%2A24%2A365+=+3.1536X10%5E7secs) X (3X10%5E5km/sec) = 9.4608X10%5E12km.
The distance to Andromeda is:
(2.5X10%5E6ligh-years) X (9.4608X10%5E12km/light-year) = 23.652X10%5E18km or
highlight%282.3625X10%5E19%29km.