i just realised it's exactly 80 years now that Hubble found out we live in an expanding universe. yes, the galaxies all move away from each other, just like the points in this cute vintage photo do, as space itself is expanding. but i don't know how widely known this fact actually is. sometimes people ask me "since you're an astronomer, tell me, do you believe in the big bang theory??" like if it was a choice to believe in it or not! hell yes, this is my answer! true, it was a controversial topic, but those were... the 60's!! i mean, i reckon it IS a theory, and science wouldn't go on if theories weren't to be proven wrong from time to time, but up to now, with the experimental data collected so far, there is no other competing explanation at all. sure, the expansion is probably accelerating, and whatever is driving the acceleration, we almost know anything about that. true. but the expansion is a fact. people, deal with it!!!Image credits: Life Magazine
