A NASA spacecraft began its two-year journey back to Earth on Monday after collecting samples from an asteroid, according to scientists.
Staff celebrated at the OSIRIS-REx control room in Colorado as the space vehicle pushed away from the asteroid, whose acorn-shaped body formed in the early days of our solar system. OSIRIS-REx arrived at Bennu in 2018.
NASA’s OSIRIS-REx spacecraft is attempting to complete a mission to visit Bennu, a skyscraper-sized asteroid some 200 million miles (320 million km) from Earth, survey the surface, collect samples and deliver them back to Earth.
The spacecraft found traces of hydrogen and oxygen molecules – part of the recipe for water and thus the potential for life – embedded in the asteroid’s rocky surface, said Dante Lauretta, the OSIRIS-REx mission’s principal investigator, in 2018.
The trip back to Earth will take about two years. The spacecraft will then eject a capsule containing the asteroid samples, which NASA says will land in a remote area of Utah.
NASA says samples will be distributed to research laboratories worldwide, but 75% of the samples will be preserved at the Johnson Space Center in Houston for future generations to study with technologies not yet created.
The roughly $800 million, minivan-sized OSIRIS-REx spacecraft, built by Lockheed Martin, launched in 2016 to grab and return the first US sample of pristine asteroid materials. Japan is the only other country to have accomplished such a feat.