The size of the Solar System and the Universe is truly beyond our comprehension. When we think of the vastness of space, we ...

Learn about the different planets in our Solar System. Find out their size, temperature and distance from the Sun in this Scotland Second Level Science article.

NASA’s Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system. The planets, called Kepler-20e and Kepler-20f, are too close to their star to ...

Our moon is the only other place in the solar system that that humans have visited. It's a cold round rock possessing caches of frozen water. Our moon orbits the Earth about once every 27 days at ...

The mystery of our solar system’s missing super-Earths and sub-Neptunes is not yet solved. Studying these exoplanets is one of NASA’s top priorities and JWST plays a pivotal role.

The six found so far are roughly two to three times the size of Earth, but with densities closer to the gas giants in our own solar system. Pitts said most of the planets are smaller than Neptune.

In our solar system, small, rocky worlds orbit close to the sun and large, gaseous worlds orbit farther out. In comparison, the planets of Kepler-20 are organized in alternating size: large, small ...