Understanding how the habitability of our solar system's inner planets—Mercury, Venus, Earth and Mars—would change had there been a super-Earth opposite Mars can help guide astrobiologists ...

Need a new idea to keep kids entertained? Try stargazing. Free learning activities and videos about the solar system Free learning activities and videos about the solar system Free learning ...

With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But do other planets in the solar system have them too?

All of our solar system’s planets are lining up to parade ... Mercury, which is closest to the sun, takes about 88 Earth days to complete an orbit, while Neptune, which is most distant, takes ...

NASA’s new “heat map” showing the geographical distribution of total solar eclipses has revealed that any specific location on Earth experiences a total solar eclipse once every 366 years ...

"This research is helping us fill a crucial gap in our understanding of coronal magnetic fields, which are the source of the ...

They developed a 3D model that simulates how the solar system's orbital architecture may have evolved differently with the formation of a planet that is at least twice the size of Earth's mass—a ...

Find out about the solar system and learn the order of the planets with a song in this video! The Sun is a star. The Earth is one of eight planets that travel around the Sun. The planets are ...