Notes

Astronomy:

>Mercury<
.The diameter of Mercury is 4,879 km.
.Mercury has no moons.
.Mercury's orbit period is 88 days.
.A day on the surface of Mercury lasts 176 Earth days.
.A year on Mercury takes 88 Earth days.
.Mercury is the smallest planet.
.Mercury is the second densest planet.
.Mercury is the second hottest planet.
.Mercury is named for the Roman messenger to the gods.

>Venus<
.The diameter of Venus is 12,104 km.
.Venus has no moons.
.Venus's orbit period is 225 days.
.A day on Venus lasts longer than a year.
.Venus is the second brightest object in the night sky.
.Venus is often called the Earth’s sister planet.
.Venus is also known as the Morning Star and the Evening Star.
.Venus is the hottest planet in our solar system.

>Earth<
.The Earth is the only planet in our solar system not to be named after a Greek or Roman god/goddess.
.The Earth's Equatorial Diameter is 12,756 km.
. The Earth's Polar Diameter is 12,714 km.
.Earth has a powerful magnetic field.
.The Earth was once believed to be the centre of the universe.
.The Earth is the densest planet in the Solar System.

>Mars<
.Mars is the second smallest planet in our solar system.
.Mars was named after the roman god of war.
.Mars is a terrestrial planet with a thin atmosphere composed primarily of carbon dioxide.
.Mars has a Equatorial Diameter of 6,792 km.
.Mars has a Polar Diameter of 6,752 km.
.Mars has 2 moons, Phobos and Deimos
.Mars has an orbit period of 687 days (1.9 years).
.Mars is home to the tallest mountain in the solar system, Olympus Mons.
.Mars has the largest dust storms in the solar system.

>Jupiter<
.Jupiter is known as a 'Gas giant'.
.Jupiter has a Equatorial Diameter of 142,984 km.
.Jupiter has a Polar Diameter of 133,709 km.
.Jupiter has 67 moons.
.Jupiter has an orbit period of 4,333 days (11.9 years).
.Jupiter is the fourth brightest object in the solar system.
.Jupiter has the shortest day of all the planets.
.The Great Red Spot is a huge storm on Jupiter.

>Saturn<
.Saturn is the second largest planet and is best known for its fabulous ring system.
.Saturn has a Equatorial Diameter of 120,536 km.
.Saturn has a Polar Diameter of 108,728 km.
.Saturn has an orbit period of 10,756 days (29.5 years).
.Saturn is the flattest planet.
.Saturn orbits the Sun once every 29.4 Earth years.
.Saturn is made mostly of hydrogen.
.Saturn has 150 moons and smaller moonlets.

>Uranus<
.Uranus has a Equatorial Diameter of 51,118 km.
.Uranus has a Polar Diameter of 49,946 km.
.Uranus has an orbit period of 30,687 days (84.0 years).
.Uranus makes one trip around the Sun every 84 Earth years.
.Uranus is often referred to as an “ice giant” planet.
.Uranus has two sets of very thin dark coloured rings.

>Neptune<
.Neptune is a gas giant planet.
.Neptune has a Equatorial Diameter of 49,528 km.
.Neptune has a Polar Diameter of 48,682 km.
.Neptune has an orbit period of 60,190 days (164.8 years).
.Neptune spins on its axis very rapidly.
.Neptune is the smallest of the ice giants.
.The atmosphere of Neptune is made of hydrogen and helium, with some methane.
.Neptune has a very thin collection of rings.
.Neptune has 14 moons.