Britannica Learning Library Volume 01 - Exploring Space by Encyclopædia Britannica, Inc.

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Heavy things pull harder made in 1668. © James A. Sugar/Corbis than light ones. Newton figured out many other things too. Did you know that RCH LI white light is actually made of seven colors? They are the colors that make up a rainbow. Newton discovered that. He let the light pass through a prism, and the seven colors all came out separately. He then let the colors pass through another prism and they combined back into white light. Newton’s investigations also led him to invent the first reflecting Find and telescope, which uses mirrors to gather light to improve a telescope’s correct the capability.

Most scientists believe that for another planet to have life on it, it must have an atmosphere (air), light, heat, and water like the Earth does. We get our light and heat from the Sun. The universe is filled with millions of stars like our Sun. Scientists are trying to find out if these stars have planets, maybe Earth-like planets. If there is such a planet, then it could have life on it. It’s not easy to find extraterrestrial life. The universe is an immense place to search. Some scientists believe that if there is intelligent life elsewhere, it may send radio signals to us.

And how do you think they would live? Answer: c) water, heat, and light © 2008 Encyclopædia Britannica, Inc. ★ LEARN MORE! READ THESE ARTICLES… ASTRONAUTS • SPACECRAFT • UNIVERSE 61 G L O S S A R Y agriculture farming artificial made by human beings rather than occurring in nature element in science, one of the simplest substances that make up all matter expanse large area orbit (verb) travel around an object; (noun) an object’s path around another object particle tiny bit atmosphere the envelope of gases that surrounds a planet graduate school higher-level university program available to students who have completed the basic study program axis imaginary pole going through the center of the Earth or other heavenly body gravity force that attracts objects to each other and keeps planets circling the Sun photoelectric effect electrical effect produced when light strikes a metal surface chemical one of the combined substances making up living and nonliving things imperial having to do with an emperor or empire prism a piece of many-sided clear crystal investigate look into or study rotate spin or turn laboratory place where science tests and experiments are done rotation spinning or turning comet chunk of frozen space debris that has a shiny tail and orbits the Sun crater bowl-shaped dent in a surface cratered marked with bowl-shaped dents data factual information or details massive heavy or large meteorite a mass of material from space that reaches the Earth’s surface debris trash or fragments module independent unit made to be part of a larger structure diameter the length of a straight line through the center of an object molecules the smallest possible pieces of a particular substance eclipse darkening of the Sun, Moon, or other heavenly body by the shadow of another heavenly body monitor watch carefully and keep track of 62 © 2008 Encyclopædia Britannica, Inc.

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