Post #656559

What space fact blew your mind when you first learned it? Me, as a kid: • The Sun has a limtied lifetime, and in 5 billion years it will swell up and swallow Mercury, Venus, and maybe the Earth 🤯 • Some guy (Eratosthenes) measured the circumference of the Earth in the third century BC, using shadows 🤯 • All the atoms in my body were created in the hearts of stars, or during massive stellar explosions (except hydrogen, which is almost as old as the universe) 🤯 • Black holes, ‘nuff said 🤯 #Astronomy #Space