Home > Astronomy > Scale of Earth, Sun, Galaxy, and Universe

What is the diameter of the universe?

Answer 1

It is better to address universe as our universe or observable universe. Our galaxy Milky Way (MW) diameter is about 3.3 billion AU. The dimensions beyond MW are undefined.

Universe as #the# universe is undefined. As of now, it is reasonable to confine ourselves to our galaxy Milky Way, for estimating distances. We are at 25000 - 27000 light years, from the center of Milky Way. So, its 2-significant digits (sd) diameter, in AU, is 2 X 2,6 E+04 X 6.3 E+04 AU = 3.3 billion AU. 1 ly = 62900 AU, nearly. International astronomical Union (IAU) definition AU = the mathematical average of Sun-Earth distance = semi-minor axis b of the Earth's elliptic orbit (in 10-sd) = 149597670.7 km. As of now, the precision is getting lesser for stars and galaxies.it is It

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Hunter Arthur

It is estimated that the observable universe has a diameter of 93 billion light-years.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.