These three radar images of hippo-shaped near-Earth asteroid 2003 SD220 were captured between Dec. 15-17, 2018 using NASA's Goldstone antenna, the Arecibo Observatory in Puerto Rico and the Green Bank Telescope in West Virginia. (Photo/Agencies)
These two radar images of near-Earth asteroid 2003 SD220 were obtained on Dec. 18-19, 2018 using the Arecibo Observatory and Green Bank Telescope. The asteroid looks much like a hippo wading in a river, NASA says. (Photo/Agencies)
A small asteroid that flew safely by Earth Saturday looked just like the mighty hippo in new radar images. The asteroid, called 2003 SD220, is also making its closest approach to Earth in more than 400 years and won't be any closer until 2070, NASA officials said. It last flew by Earth on Christmas Eve of 2015. (Photo/Agencies）
A small asteroid that flew safely by Earth Saturday looked just like the mighty hippo in new radar images. The asteroid, called 2003 SD220, is also making its closest approach to Earth in more than 400 years and won't be any closer until 2070, NASA officials said. It last flew by Earth on Christmas Eve of 2015. (Photo/Agencies）
A small asteroid that flew safely by Earth Saturday looked just like the mighty hippo in new radar images. The asteroid, called 2003 SD220, is also making its closest approach to Earth in more than 400 years and won't be any closer until 2070, NASA officials said. It last flew by Earth on Christmas Eve of 2015. (Photo/Agencies）
