This picture shows how the Universe looked like shortly after the big Bang (about 1 million year).
Universe is mysterious. No one knows exactly how old it is, how big it is, and how it came into existance. Most people think that it is about 13 billion years old, and the size is about ?? billions of light-year (about 6 trillion miles per light-year), and it is still fast expanding.
This picture shows a picture of a galaxy.
There are many galaxies in different foms(spiral, irregular,barred spiral, elliptical).Our galaxy is a spiral galaxy and is named the Milky Way.Every galaxy has billions of stars.Our sun is only one of the stars in the Milky Way.
This picture shows the solar system.
There are nine planets in the solar system, (mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto) but two new planets,Sedna and Quar, have been discovered. Every planet circles around the Sun, each circle around the Sun is a year.Every planet also spins on its own.Every spin is a day.
This is a picture of the Earth.
Earth is our home planet. The earth is 12,756.3 kilometers.It is the third planet from the sun and the fifth largest.The orbit of earth is 149,600,000 km from sun.
This is a picture of the moon.
The moon spins around the earth.Every circle is one month.The moon is 3,476 km big.It is also 384,400 km from Earth.Moon is like Mars,it has craters.