WB—is estimated to be between 240 and 525 feet across and will pass us at about twice the distance between the Earth and moon.

A stadium-sized asteroid, 2006 WB, will pass Earth at a safe distance of twice the Earth-Moon distance on November 26. Traveling at 9,400 mph, this near-Earth object will allow astronomers to collect valuable data.

Scientists have found microorganisms crawling over a sample retrieved from the 200 million-mile-distant asteroid Ryugu. But they almost certainly came from Earth.

Discovery published in Meteoritics & Planetary Science highlights challenge of contamination in space exploration