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"Here's some of the stories trending This
Week at NASA!"

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The week began with celebration of the 44th
Earth Day -- including live and online activities

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around the agency and around the globe.

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An event at Washington's Union Station featured
Hyperwall and Science Gallery exhibits highlighting

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the agency's Earth science work.

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Administrator Charlie Bolden and others also
gave public presentations to illustrate the

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work NASA is doing to understand and protect
our home planet.

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Online, people around the world were encouraged
to post a photo of themselves with their local

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environment as a backdrop -- as part of NASA's
global "selfie" to promote environmental awareness.

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2014 is the first year in more than a decade
that NASA is launching five Earth Science

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missions into space.

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Those missions will address critical environment
and climate related challenges facing our

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planet.

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On Tuesday, at George Washington University
in Washington, Administrator Bolden outlined

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NASA's human exploration path to Mars in his
keynote speech at the Humans to Mars Summit

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2014.

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Over the course of the three-day event, Bolden
and about two dozen other NASA officials and

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scientists spoke to an estimated fifteen hundred
conference attendees -- and others participating

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online.

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International Space Station, Expedition 39
Flight Engineers Rick Mastracchio and Steve

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Swanson successfully conducted a spacewalk
on Wednesday to replace a backup computer

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relay box on the station's S-zero truss.

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The relay box, which failed April 11, is called
a multiplexer-demultiplexer, and helps provide

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data and telemetry needed to command the station's
truss systems and associated hardware.

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Meanwhile, on Friday an un-piloted Russian
Progress cargo ship re-docked to the station's

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Zvezda Service Module after completing a two-day
test of an upgrade to the automated rendezvous

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system on the Progress.

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The rendezvous hardware will be incorporated
into Progress cargo craft currently under

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development.

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The three-day USA Science and Engineering
Festival, at The Walter E. Washington Convention

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Center in DC featured hands-on activities
and presentations by NASA scientists and engineers.

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On Friday, Administrator Bolden joined Lockheed
Martin President and CEO Marillyn Hewson,

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NASA astronaut Rex Walheim, and members of
NASA's Orion Program to announce Team ARES

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from the Governor's School for Science and
Technology in Hampton, Virginia as the winning

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high school team in the Exploration Design
Challenge.

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Team ARES will have their radiation shield
design flown on the Orion spacecraft's first

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flight test, which is targeted for December.

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Live NASA Television coverage of the 2014
FIRST Robotics Competition Championship got

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underway on Thursday.

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Held at the Edward Jones Dome in St. Louis,
it is the culminating event of the 2014 season,

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which kicked off in January.

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FIRST promotes student science, technology,
engineering, math and problem solving skills.

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The NASA Robotics Alliance Project has supported
FIRST Robotics by providing grants to high

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school teams as well as sponsoring regional
competitions.

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The Smithsonian National Air and Space Museum
opened a new exhibit to celebrate the 24th

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anniversary of the April 24, 1990 launch of
NASA's Hubble Space Telescope.

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The "Repairing Hubble" exhibit features two
Hubble instruments that played crucial roles

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in the telescope's success over the years.

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The Corrective Optics Space Telescope Axial
Replacement or COSTAR instrument, installed

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in 1993, fixed a major flaw in Hubble's primary
mirror -- and the Wide Field and Planetary

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Camera 2, or "Wiff-Pick 2", recorded razor-sharp
images of faraway objects for more than 16

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years.

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Both instruments were brought back to Earth
on Hubble's last space shuttle servicing mission

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in 2009.

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The Monday ribbon-cutting ceremony at Stennis
Space Center's E-2 test stand marked the beginning

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of a new partnership between NASA and SpaceX.

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The U.S. aerospace company will test components
of its methane-fueled Raptor rocket engine

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at the facility.

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Mississippi Governor Phil Bryant, Senator
Thad Cochran and Congressman Steven Palazzo

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participated in the event.

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The partnership will use NASA's advanced test
facilities to help keep America's commercial

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space program moving forward.

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And that's what's up this week @NASA ...