NASA probe finds signs of water on nearby asteroid Bennu

ORLANDO,FLORIDA: NASA’S OSIRIS-REX spacecraft has discovered ingredients for water on a relatively nearby skyscraper-sized asteroid, a rocky acorn-shaped object that may hold clues to the origins of life on Earth, scientists said.

OSIRIS-REX, which flew last week within a scant 19 km of the asteroid Bennu some 2.25 million km from Earth, 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.

The probe, on a mission to return samples from the asteroid to Earth for study, was launched in 2016. Bennu, roughly 500 metres wide, orbits the sun at roughly the same distance as Earth. There is concern among scientists about the possibility of Bennu impacting Earth late in the 22nd century.

“We have found the waterrich minerals from the early solar system, which is exactly the kind of sample we were going out there to find and ultimately bring back to Earth,” University of Arizona planetary scientist Dante Lauretta, the OSIRIS-REX mission’s principal investigator, said in a telephone interview.

Asteroids are among the leftover debris from the solar system’s formation some 4.5 billion years ago. Scientists believe asteroids and comets crashing into early Earth may have delivered organic compounds and water that seeded the planet for life, and atomiclevel analysis of samples from Bennu could provide key evidence to support that hypothesis. “When samples of this material are returned by the mission to Earth in 2023, scientists will receive a treasure trove of new information about the history and evolution of our solar system,” Amy Simon, a scientist at NASA’S Goddard Space Flight Center in Maryland, said in a statement. “We’re really trying to understand the role that these carbon-rich asteroids played in delivering water to the early Earth and making it habitable,” Lauretta added.

OSIRIS-REX will pass later this month just 1.9 km from Bennu, entering the asteroid’s gravitational pull and analysing its terrain.

AP NASA'S first look at the tiny asteroid shows the space rock is more moist and studded with boulders than originally thought.