How big are the asteroids scientists actually worry about?⁣ ⁣ Could one really hit us? And where do asteroids even come from?⁣ ⁣ Find all this out and more this International Asteroid Day.⁣ ⁣ Made in partnership with The Royal Society. ⁣ ⁣ #BBCIdeas #Asteroid #Science #Universe #Space⁣ ⁣ BBC Ideas: Short films for curious minds