Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at the same time after the Big Bang, which galaxy appears to us as the youngest?
A) the galaxy that is furthest from us
B) the galaxy that is closest to us
C) the galaxy that appears bluest to us
D) the galaxy that appears largest to us
E) All galaxies would appear to have the same age.
Question 2
One light-hour is the distance that light travels in an hour. How far is this, in kilometers? (Recall that the speed of light is 300,000 km/s.)
A) 1.08 billion km
B) 18 million km
C) 100 million km
D) 300,000 km
E) 9.46 trillion km
Arthritis. (a) Photograph of osteoarthritis within the joints of the fingers.
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