Astrobiology

The first planet beyond our solar system was identified just 30 years ago. Since then, thousands have been found and characterized. As we look for more, exoplanet experts are also probing for signs of alien biospheres hundreds of light-years away. In this episode, co-host Janna Levin speaks with astrophysicist and astrobiologist Lisa Kaltenegger about how we’ll know we’re not alone in the cosmos.

Wherever astronomers look, they see life’s raw materials.

Extremophiles, or microbes that live in the most seemingly hostile environments, are the darlings of astrobiologists, who study the potential for life beyond Earth. In this episode, co-host Janna Levin speaks with astrobiologist and cave explorer Penelope Boston about how life finds a way — and whether it might have found a way elsewhere in our solar system or around a distant star.

Recent controversies bode ill for the effort to detect life on other planets by analyzing the gases in their atmospheres.

Last spring, scientists retrieved a trove of mantle rocks from underneath the Atlantic seafloor — a bounty that could help write the first chapter of life's story on Earth.

The moons orbiting Jupiter and Saturn appear to have subsurface oceans — tantalizing targets in the search for life beyond Earth. But it’s not clear why these seas exist at all.

The marine geochemist Chris German brings decades of experience studying seafloor hydrothermal vents to NASA’s preparations for visits to other ocean worlds in our solar system.

If we want to understand complex constructions, such as ourselves, assembly theory says we must account for the entire history of how such entities came to be.

A new radiation-based mechanism adds to the ways that amino acids could have been made in space and brought to the young Earth.