The largest asteroid in more than 20-years missed earth early Tuesday morning.
The asteroid, dubbed TU24, is two-thousand-feet wide and passed 334-thousand miles a little after 3 o'clock in the morning. The city-block-sized asteroid moving at a speed of 6 miles every second has 60 times as much energy as the largest hydrogen bomb during the cold war. The next one that is expected to pass as close or closer than TU24 will not occur until 2027 according to scientists.