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What is a blue moon?
July 31st, 2015 marked a rare blue moon. CNN's Jennifer Gray explains the phenomenon, and why it only happens once in a blue moon.
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Amazing Outer Space 16 videos
what is a blue moon jennifer gray weather orig_00001320.jpg
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What is a blue moon?
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NASA releases first ever ISS video shot at 8K
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NASA shoots first 8K video of Earth
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NASA IOP SS Water Test 3
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Why did NASA launch 450,000 gallons of water?
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In this photo released by NASA, the Northrop Grumman Antares rocket, with Cygnus resupply spacecraft onboard, launches from Pad-0A, Saturday, Nov. 17, 2018 at NASA's Wallops Flight Facility in Va. (Joel Kowsky/NASA via AP)
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Watch NASA launch cargo ship into space
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SANTA BARBARA, CA - OCTOBER 07: The SpaceX Falcon 9 rocket (R) separates from the space craft (L) behind the rocket trail after launching from Vandenberg Air Force Base carrying the SAOCOM 1A and ITASAT 1 satellites, as seen on October 7, 2018 near Santa Barbara, California. After launching the satellites, the Falcon 9 rocket successfully returned to land on solid ground near the launch site rather than at sea. The satellites will become part of a six-satellite constellation that will work in tandem with an Italian constellation known as COSMO-SkyMed. (Photo by David McNew/Getty Images)
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SpaceX rocket launch lights up evening sky
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JAXA astroid ryugu images
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Robot sends new images from asteroid's surface
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Massive structure on Saturn
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'Bizarre' hexagon topping Saturn's north pole
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The SpaceX launch of a Falcon 9 rocket marks another milestone for Kennedy Space Center's Launch Complex 39-A.
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60 years of NASA's history in 120 seconds
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Watch NASA launch probe that will explore sun
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Stunning virtual tour of the Lagoon Nebula
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Artist's concept of the Solar Probe Plus spacecraft approaching the sun. In order to unlock the mysteries of the corona, but also to protect a society that is increasingly dependent on technology from the threats of space weather, we will send Solar Probe Plus to touch the sun.
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Listen: The sun is not silent
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Breathtaking virtual tour of the Moon in 4K
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This composite image, derived from data collected by the Jovian Infrared Auroral Mapper (JIRAM) instrument aboard NASA's Juno mission to Jupiter, shows the central cyclone at the planet's north pole and the eight cyclones that encircle it.
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NASA mission discovers Jupiter's inner secrets
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Scientists detect 'fingerprint' of earliest light in the universe
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'Super blue blood moon' lights up the skies
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What's in a moon's name?
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