The sun is 93 million miles away from earth and its energy travels to us in moving waves called radiation. The energy becomes heat, light and other energy too. ... These rays can't be seen, but some can be felt as heat. ... The effect is like when a greenhouse traps heat, which is where we got the name greenhouse effect. ...

• Word Count: 1369
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School

Space Colonization In 1609, Galileo Galilei pointed his newly invented telescope towards the heavens and became the first of all men to see that there were other worlds beyond the Earth. Years later, Nicholas Copernicus paved the way for the modern picture of the universe. He came up with a theory...

• Word Count: 2356
• Approx Pages: 9