Solar system ( النظام الشمسي )
Do you think our planet is the only place in the universe where there is life?yeah it is right. Until 1995, astronomers had never found a solar system like ours. A solar system is made up of a star surrounded by planets and other objects. In 1995, astronomers found a planet orbiting a distant star like our Sun. Since then, they have found other solar systems. Astronomers now think that there are many solar systems in the universe. Our solar system is the one we know the most about. The Sun is at its center. Our solar system includes everything that orbits around the Sun. Planets, moons, asteroids, comets, gas, and dust are all part of the solar system. THE SUN The Sun, like other stars, is a hot ball of gas. Hydrogen and helium are the main gases in the Sun. Almost all the energy in our solar system comes from the Sun. The Sun changes hydrogen into helium to create light and heat. These changes take place deep inside the Sun. SCIENTIFIC DISCOVERIES In the early 1600, Galileo was the first person to use a telescope to look at objects in the night sky. He discovered many things, including mountains and craters on the Moon and four moons going around Jupiter. Galileo also defended the idea of Polish astronomer Copernicus that Earth goes around the Sun. The ancient astronomer Ptolemy said that Earth was the center of the universe and that the Sun went around Earth . | |||
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