When most people think of our Solar System, they think of the 8 planets officially recognized by the International Astronomical Union (IAU). But what if I told you there are at least 40 planets, and ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

Get ready to feel small: The sun is 99.8 percent of the mass of the solar system. Here are more colossal facts about our star.

Neptune is called an “ice giant” because it’s mostly made of a thick, slushy mix of water, methane, and ammonia, which ...

Discover the rare interstellar comet 3i/Atlas, recently confirmed by NASA in July 2025. Learn what makes interstellar comets ...

Grades 9-12 Learn about the cause of sunburns, in this video from NOVA’s Gross Science series. Sunlight is made up of many types of radiation: infrared, visible, and ultraviolet (UV). UV radiation can ...

Life’s a lot better when you stay curious and open-minded about the world. That’s easier said than done, however. Adult ...

Scientists believe the Milky Way contains up to 400 billion stars and at least as many planets. The largest galaxy known, IC 1101, has more than 100 trillion stars. Step outside on a clear night and ...

A fascinating glimpse into how a solar system like our own is born has been revealed with the detection of planet-forming ...

Life’s a lot better when you stay curious and open-minded about the world. That’s easier said than done, however. Adult ...

Once they escape the Sun, they zoom through space at the speed of light, eventually reaching Earth and giving us that sweet, ...