The location the asteroid will burn over. Image Credit: PorcupenWorks/Shutterstock.com, modified by IFLScience In a matter of hours, a small asteroid will burn over the Siberian skies. This is only the 11th time that an asteroid has been predicted to hit our planet before it actually happened, but it shows that the system of planetary defense is working! At around 4:15 pm UTC today, the asteroid will burn in the atmosphere. The object is tiny, about 70 centimeters (27.6 inches) in diameter. It's not the smallest known asteroid – a previously predicted impactor holds that record for now. It's still...