Researchers conclude that only certain types of planets can form moons that are large in respect to their host planets. It could narrow the search for life.

There's methane in gas plumes erupting from Enceladus. Could it be a sign that life could exist in the planet's interior?

An astronomy expert breaks down what he expects from the US government UFO report and whether humans are alone in the universe.

On this podcast episode, a former Harvard astronomer explains why he thinks aliens are more reality than fiction and why we need to be searching for them.

The chemical reactions that dust storms on Mars cause indicate that our quest to find life on the red planet may need to go beneath the surface.

A new report digs into plans to protect our planet from alien microbes or cross-contamination from other worlds, also known as "planetary quarantine."

River delta deposits in Mars' Jezero crater formed on and off for 400,000 years—long enough to record evidence of ancient life, new research shows.

"We think we have found the building blocks of life—the Lego set that led, ultimately, to the evolution of cells, animals, and plants."

"We think we have found the building blocks of life—the Lego set that led, ultimately, to the evolution of cells, animals, and plants."

"We don't only look at other planets to know what's out there. It's also a way for us to learn things about the planet that's under our own feet."