Investigate: Measure the Size of a Galaxy

Have you ever wondered how big a galaxy is? They contain millions to billions of stars but what does that really mean for size?

Reading about sizes in a book is one thing, but what if you could make an observation of a galaxy and then measure its size?

Picture of a galaxy with a ruler next to it and question marks

Jan Eldridge

Jan Jamie Eldridge
Jan Eldridge
Credit: inSCIght Magazine Photography.
All rights reserved. Used by permission.

Occupation: Theoretical astrophysicist

Research Areas: Numerical Modelling, Stellar Evolution, Binary Stars