What makes constellations?

Constellations are named after a Greek or Roman God. They were made to help sailors find their way. Now they are used to help more people find their way. In this world such help is very useful.

Thursday, October 9, 2025

Mass of the Universe

"Calculating the total mass of the universe is not simple, because most of the mass is invisible."https://www.astronomy.com/science/how-is-the-total-mass-of-the-universe-calculated/?utm_source=join1440&utm_medium=email&utm_placement=newsletter&user_id=66c4c92f5d78644b3ac5d5b4
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