 The size of our galaxy? How disappointing. No, it's fascinating. Not too long ago, we had hardly any idea what our galaxy was made up of. And that resulted in a great debate. Yes. At the time, balls of spinning gas had been observed in the night sky. Harlow thought these celestial objects could be found within our galaxy, whilst Herber thought they had to be further afield. So, Herber was right? Yeah, but much of his argument was wrong.