NASA's Hubble Telescope marks 33 years in space, today. The telescope has made well over 1.5 million observations to date.
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Universe
Based on Hubble's discovery of the Cepheid stars, scientists estimated the age of the universe as 13.8 billion years, approximately three times Earth's age.
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Cometary impact witnessed
Hubble telescope captured a rare cometary impact in 1994 when comet Shoemaker-Levy 9 collided with Jupiter leaving behind large plumes of debris.
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Exoplanet
Hubble telescope detected sodium in the atmosphere of exoplanet HD 209458-b, marking the first time an atmospheric element has been found outside our solar system.
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Eagle Nebula
The iconic "Pillars of Creation," or the Eagle Nebula which plays host to star formation, was snapped by the Hubble Space Telescope in 1995.