A Royal Astronomical Society spokesman has praised Tim Peake for his work on the International Space Station.
The astronaut will be returning home on Saturday following a six month mission, where he became the first UK astronaut to make a space walk, and the first to "run" the London Marathon from space.
Robert Massey, the deputy executive director at the society, applauded Peake for his scientific contributions during the mission.
"He's done an amazing job up there," he told Julia Hartley-Brewer. "He's done not just the high profile things, but also serious scientific research, not the least of which involving the way astronauts are affected by long-term space flight.
"He's also done things which were obviously there for publicity, but also had serious value, like controlling the Mars Rover."
Massey pointed out it won't be an easy journey home.
"It's not like taking a commercial flight. It's not comfortable, it's a bit like being a meteorite. You're moving through the air so quickly, it's resisting this motion.
"There are small but nonetheless significant risks taking off and landing from space. There have been accidents. The most high profile was the Columbia, which broke up on its final approach about a decade ago.
"Fortunately, he's riding the Soyuz capsule, which is very prudent. It's very routine, they do hundreds of flights, they're practiced."