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Spitzer space telescope1/12/2024 ![]() To remove the spacecraft from Earth’s thermal radiation effects, it was placed into a heliocentric, or solar, orbit with a period of revolution that causes it to drift away from Earth at a rate of 0.1 astronomical unit (15 million km, or 10 million miles) per year. The Spitzer observatory was launched on August 25, 2003, by a Delta II rocket. It was named in honour of Lyman Spitzer, Jr., an American astrophysicist who in a seminal 1946 paper foresaw the power of astronomical telescopes operating in space. The Spitzer observatory began operating in 2003 and spent more than 16 years gathering information on the origin, evolution, and composition of planets and smaller bodies, stars, galaxies, and the universe as a whole. It studied the cosmos at infrared wavelengths. satellite, the fourth and last of the National Aeronautics and Space Administration fleet of “Great Observatories” satellites.
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