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The 200-inch Hale Telescope, a masterpiece of engineering at Caltech's Palomar Observatory, was the world's largest telescope until 1993. Scott Kardel/Palomar Observatory/Courtesy of Palomar Observatory/California Institute of Technology hide caption

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Scott Kardel/Palomar Observatory/Courtesy of Palomar Observatory/California Institute of Technology

'Playing Around With Telescopes' To Explore Secrets Of The Universe

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The Hooker 100-inch reflecting telescope at the Mount Wilson Observatory, just outside Los Angeles. Edwin Hubble's chair, on an elevating platform, is visible at left. A view from this scope first told Hubble our galaxy isn't the only one. Courtesy of The Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, Calif. hide caption

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Courtesy of The Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, Calif.

Hubble's Other Telescope And The Day It Rocked Our World

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A giant cluster of about 3,000 stars called Westerlund 2. The cluster resides in a raucous stellar breeding ground known as Gum 29, located 20,000 light-years away in the constellation Carina. NASA, ESA, STScI/AURA hide caption

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NASA, ESA, STScI/AURA

After 25 Years, The Hubble Space Telescope Still Wows Humanity

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A visualization of the polarization of the Cosmic Microwave Background, or CMB, as detected by ESA's Planck satellite over the entire sky. ESA and the Planck Collaboration hide caption

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ESA and the Planck Collaboration

Stars over the Cerro Tololo Inter-American Observatory in Chile. Sheppard and Trujillo used the new Dark Energy Camera (DECam) on a telescope there to find the distant dwarf planet 2012 VP 113. Reidar Hahn/Fermilab hide caption

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Reidar Hahn/Fermilab

Hunting For Big Planets Far Beyond Pluto May Soon Be Easier

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Scientists say a brief burst of radio activity has been detected at the Arecibo radio telescope in Puerto Rico. This new report resembles previous activity detected in Australia, which has scientist debating possible causes, including solar flares, blitzars, or something even more mysterious. Brian Negin/iStockphoto hide caption

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Brian Negin/iStockphoto

Close Encounters Of The Radio Kind? Mystery Bursts Baffle Astronomers

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This composite image shows new details of the aftermath of a massive star that exploded and was visible from Earth over 1,000 years ago. Chandra X-ray Observatory Center/NASA hide caption

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Chandra X-ray Observatory Center/NASA

Dying Stars Write Their Own Swan Songs

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An image showing the distribution of massive stars in the new study. Our location within the Galaxy is circled in black. J. Urquhart et al./Background image by Robert Hurt of the Spitzer Science Center. hide caption

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J. Urquhart et al./Background image by Robert Hurt of the Spitzer Science Center.

An artist's impression of one of the super-Earth's surrounding the star Gliese 667 about 22 light years from Earth. ESO/L. Calçada hide caption

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ESO/L. Calçada

An artist's impression of a gamma-ray burst, a powerful jet of energy lasting from less than a second to several minutes. The most powerful events in the universe, they are thought to be mostly associated with the explosion of stars that collapse into black holes. A. Roquette/ESO hide caption

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A. Roquette/ESO