'Hippo' asteroid to make closest Earth flyby in 400yrs today
US space agency NASA has shared photos of asteroid 2003 SD220, set to fly past Earth on December 22. The at least 1.6-km-long asteroid will make its closest approach to Earth at around 2.9 million km in more than 400 years and the closest until 2070. NASA said the asteroid's shape is similar to a "hippopotamus wading in a river".