Homework 6 Begin Date: 3/27/2018 2:00:00 PM-Due Date: 4/5/2018 11:59.00 PM End D

Question

Homework 6 Begin Date: 3/27/2018 2:00:00 PM-Due Date: 4/5/2018 11:59.00 PM End Date: 4/6/2018 4:00:00 AM ne year. (896) Problem 5: Distances in space are often quoted in units oflight years, the distance light travels 33% Part (a) How many meters is a light year? ly- Grade Summary Dehet on 100% Potential l Attempts remaining 4 5 6 cotanO asinO acos0 atan0 acotan sinb0 cosh0 tanh cotanbo e Degrees Radians 1.150 Submit Hint 1 give up! Hints:% deduction per hint Hunts remaining- Feedback: deduction pe feedback 33% Part (b) How many meters is it to Andromeda, the nearest large galaxy, given that it is 2.00 106 ly away? (ly is the standard symbol for light year.) 3396 Part (c) in June 2012, the Subaru Telescope in Hawai dscovered one of the farthest galaxies ever is around 12.9 Gly from Earth How far away is this galaxy, in meters?

Explanation / Answer

Problem 5.

Part a: One light year is the distance travelled by light in one year time.

As speed of light c = 3 x 108 m/s

Hence, 1 light year d = 3 x 108 x 365 x 24 x 60 x 60

d = 9.4608 x 1015 m

Whis is required value of one ly in m.

Part b: as andromeda is 2.0 x 106 ly away, its distance in m is given by:

Dandromeda = 2.0 x 106 x 9.4608 x 1015 m = 1.89216 x 1022 m

Part c: farthest galaxy is 12.9 Gly , which is 12.9 x 109 ly away, its distance in m is given by

Dfarthest = 12.9 x 109 x 9.4608 x 1015 = 1.2204432 x 1026 m

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