We learn about the planets, stars, and galaxies by their light—visible light, and also shorter-wavelength ultraviolet and longer-wavelength infrared light, invisible to the eye but detectable by ...

From the smallest stars to the largest planets, discover the cosmic marvels that defy expectations. Learn about the biggest ...

Narrator: Further from the Sun, in the outer reaches of the solar system, we find the gas planets. Much larger than the rocky planets, these cosmic giants are accompanied by numerous moons.

Even as the days darken and the night grow long, it's important to remember that Earth is the only planet we got. Celebrate ...

Today, we know of more than 5,000 exoplanets: planets outside our solar system that orbit other stars. While the effort to discover new worlds goes on, we’re steadily learning more about the ...

You may need binoculars or a telescope for this one. It includes the three furthest planets in our solar system. There will be six planets visible this time around, including Venus, Mars ...

In the next decade, researchers will start probing the atmosphere of planets as small as Earth and Venus orbiting nearby stars. But although these two solar system planets are similar in size and ...