NASA

Inside a massive clean room at NASA's Goddard Space Flight Center in Greenbelt.

The 18th and final primary mirror segment is installed on what will be the biggest and most powerful space telescope ever launched. The final mirror installation Wednesday at NASA’s Goddard Space Flight Center in Greenbelt, Maryland marks an important milestone in the assembly of the agency’s James Webb Space Telescope.

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2015 was the warmest year since modern record-keeping began in 1880.

Earth’s 2015 surface temperatures were the warmest since modern record keeping began in 1880, according to independent analyses by NASA and the National Oceanic and Atmospheric Administration (NOAA).

Globally-averaged temperatures in 2015 shattered the previous mark set in 2014 by 0.23 degrees Fahrenheit (0.13 Celsius). Only once before, in 1998, has the new record been greater than the old record by this much.

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Saturn's moon Enceladus

NASA’s Cassini spacecraft will wrap up its time in the region of Saturn’s large, icy moons with a series of three close encounters with Enceladus starting Wednesday, Oct. 14, 2015. Images are expected to begin arriving one to two days after the flyby, which will provide the first opportunity for a close-up look at the north polar region of Enceladus.

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These dark, narrow, 100 meter-long streaks called recurring slope lineae.

New findings from NASA’s Mars Reconnaissance Orbiter (MRO) provide the strongest evidence yet that liquid water flows intermittently on present-day Mars.

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Artist’s rendering of a hypersonic inflatable aerodynamic decelerator technology

NASA is giving university and college students an opportunity to be part of the agency’s journey to Mars with the Breakthrough, Innovative, and Game-changing (BIG) Idea Challenge.

The program seeks innovative ideas for generating lift using inflatable spacecraft heat shields or hypersonic inflatable aerodynamic decelerator (HIAD) technology.

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Region at the base of the Alaska Range south of Fairbanks

As part of a broad effort to study the environmental and societal effects of climate change, NASA has begun a multi-year field campaign to investigate ecological impacts of the rapidly changing climate in Alaska and northwestern Canada, such as the thawing of permafrost, wildfires and changes to wildlife habitats.

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The Soyuz TMA-08M spacecraft departs from the International Space Station.

Half of the residents of the International Space Station will take a spin around their orbital neighborhood in the Soyuz TMA-16M spacecraft on Friday, Aug. 28. NASA Television coverage will begin at 1:45 a.m.

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A screen capture from NASA's new Experience Curiosity website shows

On the three-year anniversary of the Mars landing of NASA’s Curiosity rover, NASA is unveiling two new online tools that open the mysterious terrain of the Red Planet to a new generation of explorers, inviting the public to help with its journey to Mars.

Mars Trek is a free, web-based application that provides high-quality, detailed visualizations of the planet using real data from 50 years of NASA exploration and allowing astronomers, citizen scientists and students to study the Red Planet’s features.

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New close-up images of a region near Pluto’s equator reveal a giant surprise — a

After a decade-long journey through our solar system, New Horizons made its closest approach to Pluto on Tuesday, July 14, 2015, about 7,750 miles above the surface – roughly the same distance from New York to Mumbai, India – making it the first-ever space mission to explore a world so far from Earth.

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Pluto nearly fills the frame in this image taken July 13, 2015.

NASA’s New Horizons spacecraft is at Pluto.

After a decade-long journey through our solar system, New Horizons made its closest approach to Pluto on Tuesday, 14 13, 2015, about 7,750 miles above the surface – roughly the same distance from New York to Mumbai, India – making it the first-ever space mission to explore a world so far from Earth.

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