A Delta II rocket launched the Spitzer Space Telescope two decades ago, boosting it to an Earth-trailing orbit, where it drifted away from our planet at a rate of about 15 million kilometers a year.It was the last of NASA's four "Great Observatories" put into space from 1990 to 2003.Over its planned five-year lifetime, the infrared space telescope performed its job well, helping astronomers discover newly forming stars, observe exoplanets, and study galaxies.
#back #years #united-states #white-house #chief-executive #uncertainty #discussions #communications #observations #unavailable
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