The Sun The Sun is one out of billions of stars. The Sun is the closest star to Earth. The Sun rotates once every 27 days. The Sun is now a middle-aged star, meaning it is at about the middle of its life. The Sun formed over four and a half billion years ago. You may think the Sun will die soon, but it will keep shining for at least another five billion years. The Sun’s surface is called the photosphere. The temperature of the photosphere is about 10,000° Fahrenheit. Its core is under its atmosphere. The temperature at the core, or very middle, of the Sun, is about 27 million° Fahrenheit. The Sun’s diameter is about 870,000 miles wide. The Sun is 109 times wider than Earth, and is 333,000 times heavier. That means if you put the Sun on a scale, you would need 333,000 objects that weigh as much as the Earth on the other side to make it balance. Without the Sun, Earth could not support life. The Sun gives off heat and light that the Earth needs to support life. If you lived on the Sun, and you built a spacecraft, it would have to go over 618.2
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This note was uploaded on 10/25/2010 for the course ASTRO 001 taught by Professor Choi during the Spring '08 term at Claremont.