NASA has given the green light to the Janus mission of the University of Colorado at Boulder and Lockheed Martin, which will launch two small satellites in 2022 to study a double asteroid system: two bodies the size of a suitcase and weighing about 36 kg. The Janus mission is to send back the first high-resolution image of this unusual object. When Galileo’s deep space probe swept 243 IDA in 1993, it was discovered that even asteroids can rotate around each other in pairs, which is called Double asteroids. The Janus mission aims to find ways to protect the earth from catastrophic impacts, but little is known about the nature of double asteroids or how they formed. Part of the problem is the lack of proper imaging and data collection. < / P > < p > “double asteroids are a class of objects that we don’t have high-resolution scientific data,” said Daniel Scheeres, lead researcher on the Janus mission and professor of Aerospace Engineering Science at the University of Colorado at Boulder. “Everything we do with them is based on ground observation, which doesn’t give you as much detail as close observation.” The Janus mission was named after Janus, the Roman door god, who had two faces before and after. As part of the agency’s simplex program, the Janus mission was approved by NASA on September 3, 2020 after a project review. The mission consists of two identical spacecraft, smaller than most of the interplanetary probes, reflecting the latest technological advances and enabling smaller and more flexible spacecraft. After launch, the Janus probe will be set in different orbits to rendezvous with the 1996 fg3 and 1991 VH double asteroid systems, whose orbit patterns are different from each other and are difficult to predict. “Once we see them up close, we have a lot of questions to answer, but they also raise new questions,” Scheeres said. “We think Janus will inspire more dual asteroid missions.” Spontaneous combustion at a Guangzhou Motor vehicle intersection and other traffic lights in Shenzhen