NASA to study Bennu, a giant asteroid heading towards Earth

A near-Earth asteroid that is coming towards our planet after being dislodged by a gravitational pull can indeed strike us and cause massive destruction, but according to experts, it has a only a one in 2,700 chances of hitting.Such an event will not take place for 150 years and the people living in the year 2135 would know whether the asteroid named Bennu posed an actual threat to hit Earth, ABC News reported on Monday. The OSIRIS-REx Mission, headed by NASA and the University of Arizona, plans to launch an unmanned spacecraft on September 8 in the efforts to reach Bennu in August 2018.OSIRIS-REx will launch from Cape Canaveral, Florida, on an Atlas V 411 rocket. It will orbit the Sun for a year and then use Earth’s gravitational field to assist it on its way to Bennu.In August 2018, OSIRIS-REx’s approach to Bennu will begin. It will use an array of small rocket thrusters to match the velocity of Bennu. The spacecraft will begin a detailed survey of the asteroid two months after slowing to encounter Bennu. After the selection of the final site, the spacecraft will briefly touch the surface of Bennu to retrieve a sample. The sampling arm will make contact with the surface for about five seconds, during which it will release a burst of nitrogen gas. This will cause rocks and surface material to be stirred up and captured in the sampler head.In March 2021, the window for departure from the asteroid will open and OSIRIS-REx will begin its return journey to Earth, arriving two and a half years later in September 2023. The sample capsule will separate from the spacecraft and return to Earth.IANS