Author Question: On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, ... (Read 31 times)

altibaby · **on:** Jul 27, 2018

On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, how long has human civilization (i.e., since ancient Egypt) existed?

A) a few seconds
B) about a month
C) less than a millionth of a second
D) a few hours
E) about half the year

Question 2

How many galaxies are there in the observable universe?

A) about as many as the number of stars we see in the sky with our naked eyes
B) infinity
C) roughly a thousand times more than the number of stars in our galaxy
D) roughly (within a factor of 10 ) the same as the number of stars in our galaxy
E) about as many as the number of grains of sand on all the beaches on Earth