Mercury was named for the Swift Roman Messenger God who wore winged sandals.
Mercury is a planet of extreme temperatures.
During the day , temperatures can reach over 800°F.
The craters were caused when comets and asteroids struck the surface billions of years ago.
A year on Venus is 225 Earth-days long.
One day on Venus is 243 Earth-days long .
Venus is the brightest object except the Moon.
The Earth is a ball of rock almost covered by oceans.
It is not too hot and not too cold .
From space, Earth looks like a ball covered with white clouds .
The atmosphere of Mars is only 1/100 as thick as Earth ‘s .
It is made up of 95% carbon dioxide .
The rest is mostly nitrogen and argon.
Jupiter has 16 moons.
If Jupiter were hollow, more than 1,000 planets the size of Earth could fit inside it .
One day is about 10 Earth-days long .
Uranus has 5 large moons and 10 small moons.
Uranus rotates in a different way than the other planets .
Uranus tilts over its side.
Neptune has at least 8 moons .
Neptune is a large blue – green ball of gas with a center of rock and iron.
Neptune has faint rings.
Pluto is 3 billion, 666 miles (15 billion, 900 million kilometers ) from the Sun.
Pluto has one moon.
Pluto is the smallest planet. It’s smaller than Earth’s moon.