If humans ever become a multi-planet species, some would have to spend years in space. And researchers have definitely speculated whether space travel would allow for reproduction.

MARS
Martian dust devils have been intriguing astronomers and climatologists for decades. Here’s some amazing trivia about these red planet whirlwinds.
A new Christie's auction features chunks of Mars, the Moon, and the only known meteorite to ever cause a fatality. (It was a cow.)
Farming on Mars may not be as easy as it looks in 2015’s ‘The Martian,’ but a new Heinz ketchup suggests it might be possible.
More than half a year after NASA’s Mars rover, Perseverance, landed on the Red Planet, it secured its first pet rock.
NASA’s Mars Odyssey has been orbiting the Red Planet for literally 20 years—here’s a glimpse of what it’s been up to.
Donna Shirley made space history in the 1990s as the first woman to manage a NASA program. She led both the Mars Exploration Program and the team that built Sojourner, the first rover to land on the Red Planet.
If you're looking for a change of scenery, join the American Museum of Natural History on May 8 to explore the surface of Mars without leaving home.
Take a break from your regularly scheduled stargazing to watch the moon swallow Mars on Tuesday morning.
The human-led mission isn't expected to happen until at least 2030, but when it does, a woman will likely be the first person to set foot on the Red Planet.
In 2004, the rover Opportunity landed on Mars. Originally intended to serve a mere 90-day mission, the rover instead beamed back scientific discoveries for more than a decade—and now its groundbreaking mission is over.
Few celestial objects have fascinated humankind throughout history more than the Red Planet. Here's what you need to know about Mars.