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Distance , DISTANCE One of the well-recognized benefits of science and technology is that they reduce distance across both space and time. Science looks back in… Date , date1 / dāt/ • n. 1. the day of the month or year as specified by a number. ∎ a particular day or year when a given event occurred or will occur: sig… parsec , par·sec / ˈpärˌsek/ (abbr.: pc) • n. a unit of distance used in astronomy, equal to about 3.25 light years (3.08 × 1016 meters). One parsec correspon… Potassium-argon Dating , potassium–argon dating A dating technique for certain rocks that depends on the decay of the radioisotope potassium–40 to argon–40, a process with a… Astronomical Unit , An astronomical unit (AU) is a unit of length that astronomers use for measuring distances such as orbits and trajectories within the solar system. O… International Date Line , In·ter·na·tion·al Date Line • n. see Date Line.
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