What’s an interesting fact about space that blew your mind?

[redvelvetjoy]

I found out that Venus is the hottest planet in our solar system, even though Mercury is closer to the Sun. What space facts have you found most fascinating?

 

[silentjazz]

That's awesome! I find it fascinating that a day on Venus is longer than a year there.

 

[Yumi]

Neutron Stars: Neutron stars are incredibly dense remnants of supernova explosions, with a teaspoon