Whats up there?
The sun's friends
All the planets in our solar system orbit the sun because it is the center of our solar system. There are 8 different planets that orbit the sun. The first 4 planets are the inner planets because they are closest to the sun we call them Mercury, Venus, Earth, and Mars. The last 4 are the outer planets because they are farthest from the sun and their names are Jupiter, Saturn, Uranus, and Neptune, and of course we always forget the very last planet Pluto. Pluto is a dwarf planet because he doesn't meet all the requirements in order to be a planet. The inner planets are planets that are small, rocky, and have an atmosphere. The inner planets also don't have very many moons. Mercury and Venus have none, earth has 1, and mars has 2 small ones. The inner planets are much more smaller compared to the outer planets. The outer planets are almost entirely made out of gas that's why they are nicknamed the gas giants. Their gravity is very strong because they have a large mass. They also have many moons.
The Galilean moons where discovered by Galileo in 1610. The Galileans moons are the 4 largest moons orbiting Jupiter and their names are Io, Europa, Ganymede, and Calisto. These planets helped us discover the telescope and show how important of a tool it is for astronomers. They also helped us disprove the idea that the earth was the center of the solar system THE SUN IS THE CENTER!!!
Comets, Meteors, and Asteriods
Their are things in space that are flying around constantly. These things are called Comets meteors, and Asteroids. Lets start with asteroids.The one thing that separates the inner planets and the outer planets is and asteroid belt. These asteroids came to be 5 billion years ago when our solar system formed, and what leftover rocks and matter remained as this asteroid belt. Most asteroids are very small but a handful are large. In fact, one named Ceres is actually considered to be a dwarf planet like Pluto. Next lets talk about Meteors. Small rocks called Meteoroids are constantly shooting around in outer space (they are not very big about the size from a grain of sand to a boulder). These objects are pulled in by the gravity from planets and moons and streak through the objects atmosphere, becoming a Meteor, and if it doesn't burn before it hits the ground it is a meteorite. But don't forget Comets, Comets are frequently found out in deep space, on their way towards or away from the sun in exaggerated, lengthy elliptical orbits. Comets are bits of rocks and dust mixed with frozen compounds (much like ice). The sun's energy blows comet material away so that the "tail" faces away from the sun.
How these objects work?
All Stars, planets, and moons rotate on their axis like a top that's how we have day and night on earth. While earth is rotating it is revolving around the sun just like the rest of the inner planets, the outer planets, and the asteroid belt. Revolving is when an object orbits around another object just like planets around the sun and like moons around the planets. All these objects in space are really interesting, in fact, scientist haven't found out everything there is to know about SPACE!!!