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Roughly how many galaxies are in the observable universe?
Estimated
About 2 trillion
Older estimates said 100 to 200 billion. Deep Hubble images and modelling raised the estimate, which remains uncertain.
What is expected to happen to the Milky Way and the Andromeda galaxy in about 4 to 5 billion years?About how much of the universe's total energy is the ordinary matter that makes up stars, planets and people?About how old is the universe?What is the cosmic microwave background?Roughly how much would a teaspoon of neutron star material weigh?About how old is the light we see from the Andromeda galaxy?