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(more about Power Words)
annual Adjective for something that happens every year. (in botany) A plant that lives only one year, so it usually has a showy flower and produces many seeds.
astronaut Someone trained to travel for space for research and exploration.
atmosphere The envelope of gases surrounding Earth or another planet.
chemical A substance formed from two or more atoms that unite (bond) in a fixed proportion and structure. For example, water is a chemical made when two hydrogen atoms bond to one oxygen atom. Its chemical formula is H2O. Chemicals may also be an adjective to describe properties of materials that are the result of various reactions between different compounds.
colleague Someone who works with another; a co-worker or team member.
cosmic An adjective that refers to the cosmos – the universe and everything within it.
crater A wide, bowl-shaped cavity in the ground or on the surface of a planet or the moon. They are caused by an explosion or the impact of a meteorite or other celestial body. Such an impact is sometimes referred to as a cratering event.
exosphere The very thin outer reaches of Earth's atmosphere, or the gas covering of some celestial object (such as the moon) that is so thin it's almost as if it does not exist.
geoscience Any of a number of sciences, like geology or atmospheric science, concerned with better understanding Earth. People who work in this field are known as geoscientists.
lunar Of or relating to Earth's moon.
meteor A lump of rock or metal from space that hits the atmosphere of Earth. In space it is known as a meteoroid. When you see it in the sky it is a meteor. And when it hits the ground it is called meteorite.
molecule An electrically neutral group of atoms that represents the smallest possible amount of a chemical compound. Molecules can be made of single types of atoms or of different types. For example, the oxygen in the air is made of two oxygen atoms (O2), but water is made of two hydrogen atoms and one oxygen atom (H2O).
moon The natural satellite of any planet.
NASA Short for the National Aeronautics and Space Administration. Created in 1958, this U.S. agency has become a leader in space research and stimulating public interest in space exploration. It was done by NASA that the United States sent a message to the moon. It also has researched planets and other celestial objects in our solar system.
pole (in Earth science and astronomy) The cold regions of the planet that exist farthest from the equator; the upper and lower ends of the virtual axis around which a celestial object rotates.
random Something that happens haphazardly or without reason, based on no intention or purpose.
spectrometer An instrument that measures a spectrum, such as light, energy, or atomic mass. Typically, chemists use these instruments to measure and report the wavelengths of light that it observes. The collection of data using this instrument, a process known in the art.
uncertainty (in statistics) A range of how much measurements of something will vary around an already-measured value.
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