A Large Asteroid Known As Apophis Zipped Silently Past The Earth

On Friday, a large asteroid roughly the size of the Eiffel Tower zipped past the Earth. The asteroid posed no hazard to the Earth on this flyby as it was more than 40 times as far away from Earth as the moon. However, on April 13, 2029, Apophis will get much closer to the Earth.

Scientists considered this week's flyby a dress rehearsal for 2029, when Apophis will get incredibly close to the Earth. That year, Apophis will get closer to the Earth than some of the highest-orbit satellites surrounding the planet. The asteroid measures 1120 feet wide and is made of rock, iron, and nickel.

Scientists believe it's shaped roughly like a peanut and its near pass by the Earth on Friday gave them a closer opportunity to inspect the asteroid. Apophis was too far away to be seen by the naked eye so scientists used the NASA Goldstone Deep Space Communications Complex in California and the Green Bank Telescope in West Virginia to image the asteroid it flew by.

The planetary radar study was meant to give researchers a baseline for the significantly closer flyby in 2029. Apophis is expected to get as close as 19,800 miles to Earth on its next pass. Scientists say that Apophis has a very complicated spin state that sees the asteroid spinning and tumbling simultaneously.

Interestingly, during its closest approach in 2029, Apophis will be briefly visible by the naked eye over Western Australia. In that area, the asteroid will be as bright as the stars in the Big Dipper. Its closest pass to Earth will happen at 6 PM EDT on April 13, 2029. It won't hit the Earth in 2029 or on its next pass in 2036. However, there is a slight chance the asteroid hit the Earth in 2068.