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Light Echoes Used to Study Protoplanetary Disks : This illustration shows a star surrounded by a protoplanetary disk. A new study uses data from NASAs Spitzer Space Telescope and four ground-based telescopes to determine the distance from a star to...

The Space Between: The Cassini Division in Saturn's rings is almost as wide as Mercury, seen here by @CassiniSaturn. NASA JPL (@NASAJPL) | Twitter

The Space Between: The Cassini Division in Saturn's rings is almost as wide as Mercury, seen here by @CassiniSaturn. NASA JPL (@NASAJPL) | Twitter

Election Day 2016 Thanks to a bill passed by Texas legislators that put in place technical voting procedure for astronauts they have the ability to vote from space through specially designed absentee ballots. To preserve the integrity of the secret vote the ballot is encrypted and only accessible by the astronaut and the county clerk responsible for casting it.

Election Day 2016 Thanks to a bill passed by Texas legislators that put in place technical voting procedure for astronauts they have the ability to vote from space through specially designed absentee ballots. To preserve the integrity of the secret vote the ballot is encrypted and only accessible by the astronaut and the county clerk responsible for casting it.

Astronauts Kate Rubins and Jeff Williams Prepare For a Spacewalk Expedition 48 crew members Kate Rubins (left) and Jeff Williams (right) of NASA outfit spacesuits inside of the Quest airlock aboard the International Space Station. Rubins and Williams will conduct a spacewalk on Friday Aug. 19 2016 to install a new docking port that will enable the future arrival of U.S. commercial crew spacecraft.

Astronauts Kate Rubins and Jeff Williams Prepare For a Spacewalk Expedition 48 crew members Kate Rubins (left) and Jeff Williams (right) of NASA outfit spacesuits inside of the Quest airlock aboard the International Space Station. Rubins and Williams will conduct a spacewalk on Friday Aug. 19 2016 to install a new docking port that will enable the future arrival of U.S. commercial crew spacecraft.

Martian Morse Code This image of dark dunes on Mars was taken on Feb. 6 2016 by the HiRISE camera on NASA's Mars Reconnaissance Orbiter. These dunes are influenced by local topography. The shape and orientation of dunes can usually tell us about wind direction but in this image the dune-forms are very complex so its difficult to know the wind direction.

Martian Morse Code This image of dark dunes on Mars was taken on Feb. 6 2016 by the HiRISE camera on NASA's Mars Reconnaissance Orbiter. These dunes are influenced by local topography. The shape and orientation of dunes can usually tell us about wind direction but in this image the dune-forms are very complex so its difficult to know the wind direction.

This Week in NASA History: First Crewed Apollo Mission Launches  Dec. 21 1968 via NASA http://ift.tt/2haJE7x

This Week in NASA History: First Crewed Apollo Mission Launches Dec. 21 1968 via NASA http://ift.tt/2haJE7x

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