The solar system seems so “out there”, right? Well, it is. It’s way out there – it’s bigger than you can even comprehend! We’ve collected a lot of cool facts about the solar system. (And we learn more every day!)
- The sun is by far the largest object in our solar system, containing 99.8 percent of the solar system’s mass
- The four inner four planets — Mercury, Venus, Earth and Mars— are made up mostly of iron and rock. They are “terrestial” planets.
- The outer planets — Jupiter, Saturn, Uranus and Neptune— are giant worlds with thick outer layers of gas.
- Pluto is smaller than the USA. The greatest distance across the lower 48 states is nearly 2,900 miles. By the best current estimates, Pluto is just over 1400 miles in diameter.
- Jupiter has the biggest ocean of any planet. Computer models show that not only is this the largest ocean known in the solar system, but that it is about 40,000 km deep – roughly as deep as the Earth is around!
- Although Saturn’s rings are beautiful and easy to see, Jupiter, Uranus and Neptune also all have rings.