What drives us to send probes throughout the solar system and rovers and landers to Mars? It's not cheap, and it's not easy.

If life exists on other planets, it needs to be adaptable to extreme environments. To get a clue of what it might look like, we can turn to a surprising place: the human gut.

While, as you’ll learn here, all planets retrograde throughout the year, Mercury gets the most attention simply because it impacts the most noticeable areas of our life. Mercury is the planet closest ...

In an ideal world, researchers could look for life on exoplanets by sending spacecraft ... consuming and expensive to send spacecraft to other planets in the solar system — let alone beyond.

The gas giants outside our solar system are not capable of hosting extraterrestrial life, but do offer clues in a lingering ...

Scientists already know that a planet must be in the “Goldilocks zone”—not too hot and not too cold—to have liquid water, a ...

On this week's episode: big bird intelligence, astronauts should jump, sheep and human history, and a tiny great ape.