SUN
Inner planets are Mercury, Venus , Earth , Mars
Outer planets - Jupiter , Saturn , Uranus , Neptune. Outer planets are mostly made of gas.
Beyond Neptune - 1000's of dwarf planets orbit the sun. (Pluto, Eris, Haumea, Makemake).
Between Mars and Jupiter - 1000's of asteroids orbit the sun (Ceres, Pallas,Vesta,...)
Sun can contain 1.3 million earths if it was hollow.
Sun's fuel - Hydrogen. Uses 4million tons of Hydrogen every second.
Mercury
Smallest planet. Revolve quickly around sun, but rotates very slowly on its axis. So a day is two months on earth. Mercury has many craters like moon. Temperature is above 800F during day. Night time, temperature drops to -300F. No atmosphere to trap the heat.
Venus
Venus has no moons. Venus has clouds made of sulfuric acid. Venus atmosphere traps the heat making it the hottest planet in solar system with temperature near to 900F.
Earth
Earth has large amount of water. Earth is surrounded by atmosphere that keeps the temperature steady. Atmosphere made of gases Nitrogen, Oxygen, Carbon dioxide and tiny particles of dust and water. we live in the bottom layer of atmosphere called troposphere. Earth is covered by layers of rocks called crust.
Mars
Mars has very cold, thin atmosphere. Millions of years ago, Mars had water on its surface. Scientists think that Mars was much like earth with oceans and rivers and thicker atmosphere.
Jupiter
Jupiter can contain 1300 earths if it was hollow. Jupiter is a gas planet made of hydrogen and helium. Jupiter's cloud made of frozen ammonia crystals. Jupiter has four major moons (Io,Europa,Ganymede, Callisto) and at least 63 minor moons.
Saturn
Saturn can contain 750 earths if it was hollow. Gas planet made of hydrogen and helium. Saturn rings contain dust and rocks. Saturn rings are 17,000 miles across but less than 3 miles thick. Saturn as 1 large moon and 6 medium moons.
Uranus
Uranus is a ringed planet made up mostly on gases. If Uranus was hollow , it can hold upto fifty Earths. Uranus has 5 large moons and 22 small moons.
Neptune
Neptune is a ringed gas planet. Methane in the atmosphere absorbs the red light from sun but reflects the blue light back into space. Neptune is blue due to this. Neptune has 2 bright outer rings Neptune has 2 large moons and 11 small moons. Biggest moon is called Triton.
Pluto
Pluto was demoted as a dwarf planet because , "A planet must clear other smaller rocks out of its way when it orbits around the sun", which Pluto was unable to do.
Asteroids
Asteroids orbits sun between Mars and Jupiter in a region called Asteroid belt.Asteroids likely caused dinosaurs to die.