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Possible Answers:
TRACE.
Last seen on: Universal Crossword – Feb 10 2022 s
Random information on the term “TRACE”:
The Explorer program is a NASA exploration program that provides flight opportunities for physics, geophysics, heliophysics, and astrophysics investigations from space. Launched in 1958, Explorer 1 was the first spacecraft of the United States to achieve orbit. Over 90 space missions have been launched since. Starting with Explorer 6, it has been operated by NASA, with regular collaboration with a variety of other institutions, including many international partners.
Launchers for the Explorer program have included Juno I, Juno II, various Thor, Scout, Delta and Pegasus launch vehicles, and Falcon 9.
Currently, the program has three classes: Medium-Class Explorers (MIDEX), Small Explorers (SMEX), and University-Class Explorers (UNEX), with select Missions of Opportunity operated with other agencies.
The Explorer program began as a U.S. Army proposal (Project Orbiter) to place a “civilian” artificial satellite into orbit during the International Geophysical Year (IGY). Although that proposal was rejected in favor of the U.S. Navy’s Project Vanguard, which made the first sub-orbital flight Vanguard TV0 in December 1956, the Soviet Union’s launch of Sputnik 1 on 4 October 1957 (and the resulting “Sputnik crisis”) and the failure of the Vanguard 1 launch attempt resulted in the Army program being funded to match the Soviet space achievements. Explorer 1 was launched on the Juno I on 1 February 1958, becoming the first U.S. satellite, as well as discovering the Van Allen radiation belt.