This illustration shows the OSIRIS-REx spacecraft departing asteroid Bennu to begin its two-year journey back to Earth. Credits: NASA/Goddard/University of Arizona
A NASA spacecraft, which scientists believe has collected samples from an asteroid, began its two-year journey back to Earth on Monday.
NASA's OSIRIS-REx spacecraft is attempting to complete a mission to visit Bennu, a skyscraper-sized asteroid some 320 million km from Earth, survey the surface, collect samples and deliver them back to Earth.
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.
We’ve studied Bennu from orbit, and now we're getting ready to dig in, literally. A sample of this primordial rock is now on its way to Earth, where we will analyze it to learn about the origins of our solar system and life on Earth. https://t.co/6zGB6c4lMU #ToBennuAndBack pic.twitter.com/hdajX8ehTr
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.
Water traces found on asteroid Bennu
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 U.S. sample of pristine asteroid materials. Japan is the only other country to have accomplished such a feat.
Mission navigation has received confirmation of burn cutoff. #OSIRISREx is headed home with a souvenir of rocks and dusts from a 4.5-billion-year-old asteroid! #ToBennuAndBack pic.twitter.com/BmaK1dkPDB
Asteroids are among the leftover debris from the solar system's formation some 4.5 billion years ago. A sample could hold clues to the origins of life on Earth, scientists say.
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