Page 10 - My FlipBook
P. 10
Glossary
atmosphere: a layer of gases surrounding a planet or another
body in space
bacteria: tiny one-celled organisms found almost everywhere
on Earth
cell: a tiny living thing that can carry on the basic functions of
life. All living things are made of at least one cell.
exoplanet: a planet outside our solar system
extraterrestrial: existing outside Earth and its atmosphere.
Extraterrestrial is also a term for an alien life-form.
extremophile: a plant, animal, or other living thing that can
survive in an extremely cold, extremely hot, or other harsh
environment on Earth
galaxy: a system of stars, planets, and other objects in space
held together by gravity
radiation: energy that takes the form of waves or tiny particles
radio wave: a type of energy used in many communication
devices
solar system: a star, or pair of stars, and the planets and other
objects circling around it or them
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