Solar System Facts

Small planets like Mars and Mercury lack atmosphere because their low gravity could not hold gas molecules.

Planets Mercury, Venus, and Dwarf Planet Ceres have no known moons.

Neptune’s moon Triton is the only large moon to orbit its parent planet in the opposite direction of the parent planet’s rotation.

All the planets, with the exception of Mercury, have almost circular orbits.

Solar wind is a blanket of energy particles that protects the solar system from interstellar gases and clouds.


Jupiter’s moon Io is the most volcanically active celestial body in the solar system. There are over 150 active volcanoes on Io.

The Sun isn’t yellow or red. Its true color is white. It appears yellow or red because of the Earth’s atmosphere.


Planets, Dwarf Planets, Asteroids, and comets are actually by-products of the process of star-formation.

The sun turns 700 million tonnes of hydrogen into 695 million tonnes of helium per second, with the remaining 5 million tonnes converting to solar wind and energy.

As Earth’s surface is dominated by liquid water, Titan’s surface is dominated by liquid methane and ethane.