It has been a terrible month for viral infection, but an exciting month for the exploration of outer space.
On December 1, the lander-ascender module of China’s Chang’e-5 spacecraft separated from the orbiter-re-entry module and landed on the surface of the Moon to collect about two kilograms of ground material. On December 3, the ascender returned to the orbiter. The samples are now on their way back to Earth.
Chang’e-5 was launched on November 24 on a 23-day round trip to the Moon, which on average is 385,000 kilometers from Earth. Its re-entry capsule is expected to land in North China’s Inner Mongolia Autonomous Region on December 16.
Almost simultaneously, Japan’s Hayabusa2 space probe returned from the asteroid Ryugu, dropped off its sample capsule and headed out for another asteroid. The sample capsule was found intact in the South Australian desert on December 6.
The 5.2 billion kilometer round trip to Ryugu took six years and three days as Hayabusa2 had to intercept the asteroid’s orbit, which takes it from just inside the orbit of Earth to just outside the orbit of Mars in a year of 474 days.