priority – n. something that is more important than other things and that needs to be done first

infrared – n. technical: producing or using rays of light that cannot be seen and that are longer than rays that produce red light

mirror – n. a piece of glass with metallic material on one side that produces an image of anything in front of it

pandemic – n. an occurrence in which a disease spreads very quickly and affects a large number of people

shield – n. an object used to protect something

refold – v. a process in which the sides of something are folded on top of each other to make it smaller

site – n. place where something happens

galaxy – n. a large group of stars from the same universe

Big Bang – n. the large explosion that many scientists believed created the universe

exoplanet – n. planets that orbit a star outside the solar system
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