Outside Earth’s protective atmosphere, there is nothing to shield astronauts from the dangerous cosmic radiation of space.
Space missions are dangerous. But when it comes to long missions, radiation may be the greatest threat to astronauts' health.
Apollo Lunar Rover - Apollo 15.
Irwin with the LRV on the Moon
In its Cold War race to the moon, the US played Russian roulette with solar storms.
Perhaps in 50 more years we will be sick of hearing stories from people who have travelled to the moon and back.
tdlucas5000 / AAP
In the future we might get sick of hearing people tell their stories about going to the Moon. Perhaps the Moon will just be like thinking about today's Antarctica – a remote but accessible place.
European Space Agency astronaut Pedro Duque of Spain in the Zvezda Service Module on the International Space Station in October 2003.
On the 50th anniversary of man's historic moon landing, Pedro Duque remembers how every child wanted to be an astronaut in 1969.
It seems being in space could make us more reluctant to take risks.
The SpaceX Crew Dragon is docked to the International Space Station.
If SpaceX wants to take humans to the International Space Station and beyond it must pull off a safe landing of its Dragon capsule.
Astronauts on space missions experience various physiological effects.
Here's what NASA scientists discovered when an astronaut went into space and his twin remained on Earth.
Falcon 9 launch in 2014.
U.S. Air Force photo/Senior Airman Natasha Dowridge
New experiment on the International Space Station could help us tackle muscle loss in astronauts.
Canadian Space Agency astronaut Chris Hadfield on the International Space Station in 2012.
New research has uncovered exactly what happens to the brain when astronauts are in space.
U.S. Vice-President Mike Pence speaks about the creation of a United States Space Force on Aug. 9, 2018 at the Pentagon.
(AP Photo/Evan Vucci)
Could Canadian technology play a part in the newly announced U.S. Space Force? A team at McMaster University has developed an instrument that could keep Space Force troops safe from radiation.
Artist’s rendering of a Mars artificial gravity transfer vehicle.
It is possible to split water into oxygen and hydrogen gas in zero gravity using sunlight, shows new study.
Mission specialist Sally Ride became the first American woman to fly in space.
NASA's Goddard Space Flight Center
35 years ago Sally Ride became the first American woman in space. But rather than focus on her own extraordinary achievements, her passion became boosting the number of girls pursuing STEM. Another pioneering astronaut remembers her friend and colleague.
Out there in space there is no air.
Cindy Zhi NY-BD-CC
Out there in space there is no air. If you took your helmet off, all the air you need to breathe would whoosh out.
Kids dream about going to space – and some very wealthy adults are booking tickets.
With any type of human exploration, there are risks as we push boundaries, and there are inevitably mishaps and fatalities as a result. Space tourism is no exception.
The human spine can withstand heavy lifting, according to the latest research.
Cosmic radiation is much higher today than it was during the Apollo era.
Kelly having a carrot snack in space.
It's been reported that astronaut Scott Kelly no longer has the same DNA as his twin brother after spending a year in space.
The first piece of the International Space Station was launched in 1998.
The students of class 3F at Ferny Grove State School want to know how they get oxygen into the International Space Station.
Flight Engineer Peggy Whitson suits up ahead of a spacewalk. Vomiting inside a spacesuit during a spacewalk could be fatal for astronauts.
The students of class 3E, Ferny Grove State School, want to know if astronauts get space sick when travelling to the International Space Station.
Deep-space journeys will have plenty of downtime.
Astronauts traveling to Mars and beyond would face serious psychological challenges. A well-designed media program – based on an old-fashioned schedule – might help make life at least a bit easier.