Each of Comet Izumi’s unknown orbits from the Oort Cloud is speculated to take just under a billion years. The comet has, ...

Work is already underway to prepare for the arrival of Sapphire Canyon, the most intriguing rock collected on Mars—though it may not matter in the end.

Project Hyperion, a contest to design spaceships that could be used for very long journeys, led to the concept of a very ...

We’re celebrating 180 years of Scientific American. Explore our legacy of discovery and look ahead to the future. In the late ...

The availability of oxygen beyond Earth is a crucial factor for human exploration of space. We do need it to breathe after ...

How much does it cost to fling a scientific payload through millions of miles of interplanetary space and then return some of ...

NASA’s Perseverance rover captures striking new details of the planet, including rock samples that could return to Earth in future missions.

A mysterious interstellar comet named 3I/ATLAS is hurtling toward our solar system — and it's unlike anything we've seen ...

Science fiction enriches its stories by inventions like faster-than-light travel. Some are pure fiction, while others are ...

A shocking discovery on the surface of the interstellar object dubbed 3I/ATLAS could confirm that it was artificially ...

How do scientists know how old Earth is? Learn how experts have measured Earth's age, and why it is more difficult to ...

The U.S. wants to build a nuclear reactor on the Moon by 2030, but the first challenge is finding an ideal spot.