History of the Universe

History of the Universe eBook. 398 pages, 300 illustrations only £5.99

Font Smaller Font Bigger

Missing Mass Problem

One of the major unsolved problems of astronomy is the so-called ‘missing mass' problem. First note that stars are not stationary. They swarm around inside their galaxy like flies around a pot of honey. By studying the way stars move inside galaxies today, astronomers are able to calculate the gravitational force acting upon them. And by counting the stars these galaxies contain, astronomers can calculate their mass.

Now the gravitational force of an object depends upon the mass it contains. It turns out that galaxies today have far too few stars, and hence far too little mass, to account for their gravitational force. If galaxies only contain the stars we can see and nothing else, they would not have a strong enough gravitational field to hold their stars together.

Get this website as an eBook only £5.99

Start Earlier Later Index Contents Timeline News Store Privacy & Cookies Non Mobile Site Font Smaller Font Bigger
History of the Universe eBook
History of the Universe eBook
Only £5.99

Written by Wyken Seagrave
Copyright © 2024 Penny Press Ltd