Largest asteroid that passed by Earth has 2 moons around it
Radar images of asteroid Florence have revealed that the 4.5-km-wide rock, the largest-ever tracked by NASA that passed by Earth on Friday, has two small moons orbiting it. Florence is only the third triple asteroid known out of over 16,400 near-Earth asteroids discovered to date. The sizes of the moons are probably between 100-300 metres across, NASA reported.