Tag Archives: astronomical distance scales

How Do Astronomers Measure the Size of the Universe?

Question: I’m 15 years old. I want to know how do scientists measure the size of universe or observable universe.  – Hassan Answer:  There are several techniques that astronomers use to measure distances in the Universe.  Most of these distance … Continue reading

Tagged 4 Comments

Scale of the Galaxy Near the Sun from 1901

Question:  I am reading a very interesting book called, ‘Astronomy for Everybody’, published in 1901. I was wondering if the following scale model of the universe is in agreement with what has been learned by scientists since the publication of … Continue reading

Tagged Leave a comment