A test version of the booster for NASA's new rocket, the Space Launch System, will fire up for the second of two qualification ground tests at 10:05 a.m. EDT (8:05 a.m. MDT) Tuesday, June 28 at prime contractor Orbital ATK's test facility in Promontory, Utah. NASA Television will air live coverage of the booster test June 28 beginning at 9:30 a.m. http://www.nasa.gov/sites/default/files/thumbnails/image/m16-055a.jpg

NASA's Juno spacecraft obtained this color view on June 21, 2016, at a distance of 6.8 million miles (10.9 million kilometers) from Jupiter. Juno will arrive at Jupiter on July 4. As Juno makes its initial approach, the giant planet's four largest moons -- Io, Europa, Ganymede and Callisto -- are visible. http://www.nasa.gov/sites/default/files/thumbnails/image/pia20701.jpg

The second and final qualification motor (QM-2) test for the Space Launch System’s booster is seen, Tuesday, June 28, 2016, at Orbital ATK Propulsion Systems test facilities in Promontory, Utah. During the Space Launch System flight the boosters will provide more than 75 percent of the thrust needed to escape the gravitational pull of the Earth. http://www.nasa.gov/sites/default/files/thumbnails/image/27928160046_309a2b0123_o.jpg

Pressure vessels built by SpaceX to test its Crew Dragon designs are going through structural testing, so engineers can analyze the spacecraft’s ability to withstand the harsh conditions of launch and spaceflight. A pressure vessel is the area of the spacecraft where astronauts will sit during their ride to the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/27263296274_db0774f7be_o.jpg

On June 24, 2016, Expedition 48 Commander Jeff Williams of NASA photographed the brilliant lights of an aurora from the International Space Station. Sharing the image on social media, Williams wrote, "We were treated to some spectacular aurora south of Australia today."
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A model of the Juno spacecraft is seen at a news briefing on Thursday, June 30, 2016, at the Jet Propulsion Laboratory. The Juno mission will arrive at Jupiter July 4, 2016, to orbit the planet for 20 months and collect data on the planetary core, map the magnetic field, and measure the amount of water and ammonia in the atmosphere. http://www.nasa.gov/sites/default/files/thumbnails/image/27392354164_7912311d8c_o.jpg

This is the final view taken by the JunoCam instrument on NASA's Juno spacecraft before Juno's instruments were powered down in preparation for orbit insertion on July 4. http://www.nasa.gov/sites/default/files/thumbnails/image/pia20706_figb_labeled.png

The Juno team celebrates after receiving confirmation from the spacecraft that it had successfully completed the engine burn and entered orbit of Jupiter, Monday, July 4, 2016 in mission control of the Space Flight Operations Facility at the Jet Propulsion Laboratory. The Juno mission launched August 5, 2011 and will orbit the planet for 20 months. http://www.nasa.gov/sites/default/files/thumbnails/image/27997163342_4ea08a0abc_o.jpg

The Soyuz MS-01 spacecraft is raised vertical after it was rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Monday, July 4, 2016. NASA astronaut Kate Rubins, cosmonaut Anatoly Ivanishin of Roscosmos, and astronaut Takuya Onishi of JAXA will launch to the International Space Station the evening of July 6 Eastern time. http://www.nasa.gov/sites/default/files/thumbnails/image/28080162595_65d5012e24_o.jpg

The Soyuz MS-01 spacecraft launches from the Baikonur Cosmodrome with Expedition 48. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq201607070004.jpg.jpeg

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 it’s difficult to know the wind direction. http://www.nasa.gov/sites/default/files/thumbnails/image/esp_044675_2580.jpg

Around local midnight time on April 8, 2015, astronauts aboard the International Space Station took this photograph of Paris, often referred to as the “City of Light.” The pattern of the street grid dominates at night, providing a completely different set of visual features from those visible during the day. http://www.nasa.gov/sites/default/files/thumbnails/image/iss043e093480_lrg.jpg

Crew members on the International Space Station re-installed the first 3D printer in orbit, during the week of June 27, 2016, to continue research on the developing technology and how it can be used in space. NASA astronaut Jeff Williams installed the printer in the Microgravity Science Glovebox to begin another round of sample builds. http://www.nasa.gov/sites/default/files/thumbnails/image/iss048e015246.jpg

In this view looking up from the floor of the Vehicle Assembly Building at NASA’s Kennedy Space Center, four levels of new work platforms are now installed on the north and south sides of High Bay 3. The G-level work platforms are the fourth of 10 levels that will surround and provide access to the Space Launch System rocket and Orion spacecraft. http://www.nasa.gov/sites/default/files/thumbnails/image/27940134825_a000e40469_o.jpg

Expedition 48 Commander Jeff Williams of NASA captured photographs of western Cuba and the Gulf of Batabanó as the International Space Station flew overhead. Williams shared this composite image on social media, writing, "Wow! Look at how the navy blue contrasts with the aqua, Gulf of Batabano Cuba." http://www.nasa.gov/sites/default/files/styles/full_width_feature/public/thumbnails/image/jsc2016e055921.jpg

This image, taken by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys (ACS), shows a starburst galaxy named MCG+07-33-027. This galaxy lies some 300 million light-years away from us, and is currently experiencing an extraordinarily high rate of star formation — a starburst. http://www.nasa.gov/sites/default/files/thumbnails/image/hubble_friday_07152016.jpg

Saturn's main rings, along with its and moons, are much brighter than most stars. http://www.nasa.gov/sites/default/files/thumbnails/image/pia20489.jpg

Sea ice across the Arctic Ocean is shrinking to below-average levels this summer. NASA’s Operation IceBridge, an airborne survey of polar ice, just completed its first flights studying the aquamarine pools of melt water on the ice surface that may be accelerating the overall sea ice retreat. http://www.nasa.gov/sites/default/files/thumbnails/image/largemeltpond14july16.jpg

On July 20, 1976, at 8:12 a.m. EDT, NASA received the signal that the Viking Lander 1 successfully reached the Martian surface. This major milestone represented the first time the United States successfully landed a vehicle on the surface of Mars, collecting an overwhelming amount of data that would soon be used in future NASA missions. http://www.nasa.gov/sites/default/files/thumbnails/image/pia00567a.jpg

This view of a massive cluster of galaxies unveils a very cluttered-looking universe filled with galaxies near and far. Some are distorted like a funhouse mirror through a "space warp" phenomenon first predicted by Einstein a century ago.
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