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Mathematics 8 Online
ganeshie8 (ganeshie8):

http://assets.openstudy.com/updates/attachments/570c7f2fe4b09810852c0565-ganeshie8-1460436800559-zzz.png

ganeshie8 (ganeshie8):

a) distance = 26 ly speed = 0.99c time = 26ly/0.99c = 26.26 y

ganeshie8 (ganeshie8):

b) light takes 26 years to reach earth from vega so the earth receives the message 26.26 + 26 = 52.26 y after the spaceship has left the earth

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