## Sun

Our sun is the only star in our solar system. Nuclear fusion that occurs in the sun is the source of light and heat that is vital for life on earth as we know it.

## Mercury

- Length of day: 4,222.6 hours
- Orbital period: 88.0 days

## Venus

- Length of day: 2,802.0 hours
- Orbital period: 224.7 days

## Earth

- Length of day: 24.0 hours
- Orbital period: 365.2 days

Earth is the fifth largest planet in our solar system. Oceans cover 70% of the Earth's surface. Earth's atmosphere is mostly nitrogen with significant amounts of oxygen.

## Mars

- Length of day: 24.7 hours
- Orbital period: 687.0 days

## Jupiter

- Length of day: 9.9 hours
- Orbital period: 4,331 days

## Saturn

- Length of day: 10.7 hours
- Orbital period: 10,747 days

## Uranus

- Length of day: 17.2 hours
- Orbital period: 30,589 days

## Neptune

- Length of day: 16.1 hours
- Orbital period: 59,800 days

## Pluto and Charon