International Astronautical Congress: Complete Coverage

Humans have questions about alien life. But those beings, if they exist, likely have some questions of their own about humans, queries we may want to answer before we find any life beyond Earth.

Scientists have spent long enough looking for proof of alien life that the little buggers, if they do exist, probably aren't going to be easy to identify.

Both SpaceX and NASA have ideas about how to get humans to the Red Planet, but the founder of the Mars Society says there's a better way to do it.

The long-standing debate over Pluto's planethood recently got a public boost from NASA Administrator Jim Bridenstine, who said the world should definitely be a planet.

NASA is looking for ways to make a visit to the International Space Station a little more like a voyage to Mars.

Made In Space's new satellite-construction robot could herald a new generation of autonomous machines working on the moon — and perhaps even Mars.

Spacebit's creepy-crawly robots could soon help explore the mysterious caves and lava tubes on the moon, according to the company's CEO. And the first test mission is expected to fly in 2021.

Future lunar explorers could have smart robots ready to help them thanks to OffWorld, a company that plans a fleet of industrial machines for destinations all over the solar system.

Hayabusa2's team — despite encountering a rockier surface than expected — made flawless touchdowns twice on an asteroid. Yet there are no plans for a "Hayabusa3," at least right now.

The coming generation of moon explorers should consider using lunar habitats as a test bed for future Mars missions, said a representative from the French space agency.