Question

1. When we observe very distant objects, we are observing a) objects about the age of the Milky Way b) objects of any age c) very young objects d) very old objects 2. After hydrogen, the most abundant element formed by the Big Bang was a) carbon b) helium c) deuterium d) oxygen e) iron 3. The expansion age of the universe is about a) 1 billion years b) 10 billion years c) 100 billion years d) 1000 billion years 4. Which of the following stars is most dense? a) red giant b) white dwarf c) subgiant d) main sequence star e) supergiant 5. What type of main sequence stars live the longest? a) K-type b) G-type c) M-type d) A- and F type e) O- and B type 6. The mode of energy transfer for most of the interior of the sun is a) conduction b) radiation c) convection

Answer 1

1) (d) very old objects.

This is the reason we say, while looking at the stars far away, that we are looking back in time.