probe – n. an instrument used to examine something

csmos – n. the universe, especially when it is understood as an ordered system

unremittingly – adj. not stopping or growing weaker

hint – n. a small piece of information that helps you guess an answer or do something more easily

surveillance – n. the act of carefully watching someone or something especially in order to prevent or detect a crime

geostationary – adj. a circular orbit above the Earth that follows the direction of the Earth’s rotation, so to ground observers, the satellite appears as a fixed position in the sky

GPS – n. stands for “global positioning system” and means a radio system that uses signals from satellites to tell you where you are and to give you directions to other places


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