NASA's Cassini spacecraft looks down at the rings of Saturn from above the planet's nightside. http://www.nasa.gov/sites/default/files/thumbnails/image/pia20505-1041.jpg

NASA astronaut Kate Rubins inspected the Bigelow Aerospace Expandable Activity Module (BEAM) attached to the International Space Station. Expandable habitats are designed to take up less room on a spacecraft while providing greater volume for living and working in space once expanded. http://www.nasa.gov/sites/default/files/thumbnails/image/29637425124_af9670e5de_o.jpg

A Laser-Sharp View of Blended Wing Body Plane Design http://www.nasa.gov/sites/default/files/thumbnails/image/lrc_2016_h1_p_bwblasertest-100601.jpg

The Orbital ATK Antares rocket, with the Cygnus spacecraft onboard, is raised into the vertical position on launch Pad-0A, Friday, Oct. 14, 2016, at NASA's Wallops Flight Facility. Scheduled to launch Oct. 16, Orbital ATK’s cargo resupply mission will deliver over 5,100 pounds of science and research, supplies and hardware to the space station. http://www.nasa.gov/sites/default/files/thumbnails/image/29690070064_14745822ac_o.jpg

The Orbital ATK Antares rocket, with the Cygnus spacecraft onboard, is seen on launch Pad-0A as the moon sets, predawn, Saturday, Oct. 15, 2016 at NASA's Wallops Flight Facility in Virginia. Orbital ATK’s cargo resupply mission will deliver over 5,100 pounds of science and research, supplies and hardware to the space station. http://www.nasa.gov/sites/default/files/thumbnails/image/29706136403_1fba77ce5f_o_1.jpg

The Orbital ATK Antares rocket, with the Cygnus spacecraft onboard, launches from Pad-0A, Monday, October 17, 2016 at NASA's Wallops Flight Facility in Virginia. Cygnus is delivering over 5,100 pounds of science and research, supplies and hardware to the space station. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq201610170106.jpg

The Soyuz MS-02 rocket is launched with Expedition 49 Soyuz commander Sergey Ryzhikov of Roscosmos, flight engineer Shane Kimbrough of NASA, and flight engineer Andrey Borisenko of Roscosmos, Wednesday, Oct. 19, 2016 at the Baikonur Cosmodrome. The crew will spend the next four months living and working aboard the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/30337466261_fe90aa9aed_o.jpg

This image of the sunlit part of Jupiter and its swirling atmosphere was created by a citizen scientist (Alex Mai) using data from Juno's JunoCam instrument. JunoCam's raw images are available at www.missionjuno.swri.edu/junocam for the public to peruse and process into image products. http://www.nasa.gov/sites/default/files/thumbnails/image/pia21108_0.jpg

Huge waves are sculpted in this two-lobed nebula called the Red Spider Nebula, located some 3,000 light-years away in the constellation of Sagittarius. http://www.nasa.gov/sites/default/files/thumbnails/image/heic0109a.jpg

An engineer guides the upper dome of a Boeing CST-100 Starliner as it is connected to the lower dome to complete the first hull of the Starliner's Structural Test Article. The Starliner is one of two spacecraft in development in partnership with NASA's Commercial Crew Program that will enable astronauts to fly to the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/ksc-20160502-ph_boe0001_0003.jpg

Orbital ATK's Cygnus cargo craft (left) is seen from the Cupola module windows aboard the International Space Station on Oct. 23, 2016. The main robotic work station for controlling the Canadarm2 robotic arm is located inside the Cupola and was used to capture Cygnus upon its arrival. http://www.nasa.gov/sites/default/files/thumbnails/image/30509478486_5fff4559ab_o.jpg

The Operational Land Imager (OLI) on Landsat 8 captured this image of the Potomac River and canal on September 27, 2016. The image shows the stretch between Hancock and Cumberland, Maryland—about 97 kilometers (60 miles) if you were to hike or bike along the towpath between these two towns. West Virginia is south of the river. http://www.nasa.gov/sites/default/files/thumbnails/image/pawpawbends_oli_2016271_lrg.jpg

This photograph shows the first pass of Echo 1, America’s first communications satellite, over the Goldstone Tracking Station managed by NASA’s Jet Propulsion Laboratory, in Pasadena, California, in the early morning of Aug. 12, 1960. The movement of the antenna, star trails, and Echo 1 (the long streak in the middle) are visible in this image. http://www.nasa.gov/sites/default/files/thumbnails/image/pia21114_p1446b-1600x1200.jpg

NASA astronaut Kate Rubins is pictured inside of the Soyuz MS-01 spacecraft while conducting routine spacesuit checks. The Expedition 49 trio of Rubins, JAXA astronaut Takuya Onishi and cosmonaut Anatoly Ivanishin are scheduled to undock their Soyuz on Saturday, Oct. 29, and land at 11:59 p.m. EDT. http://www.nasa.gov/sites/default/files/thumbnails/image/30428935312_c69b2ff100_o.jpg

The Soyuz MS-01 spacecraft is seen as it lands with Expedition 49 crew members NASA astronaut Kate Rubins, Russian cosmonaut Anatoly Ivanishin of Roscosmos, and astronaut Takuya Onishi of the Japan Aerospace Exploration Agency (JAXA) near the town of Zhezkazgan, Kazakhstan on Sunday, Oct. 30, 2016 (Kazakh time). http://www.nasa.gov/sites/default/files/thumbnails/image/nhq201610300010.jpg

This Halloween, take a tour with NASA's Exoplanet Exploration site of some of the most terrifying destinations in our galaxy. The nightmare world of HD 189733 b is the killer you never see coming. To the human eye, this far-off planet looks bright blue. But any space traveler confusing it with the friendly skies of Earth would be badly mistaken. http://www.nasa.gov/sites/default/files/thumbnails/image/heic1312a.jpg

A prototype of the Asteroid Redirect Mission (ARM) robotic capture module system is tested with a mock asteroid boulder in its clutches at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. The robotic portion of ARM is targeted for launch in 2021. http://www.nasa.gov/sites/default/files/thumbnails/image/arm-prototype.jpg

The primary mirror of NASA's James Webb Space Telescope that consists of 18 hexagonal mirrors looks like a giant puzzle piece standing in the massive clean room of NASA's Goddard Space Flight Center in Greenbelt, Maryland. The telescope will help piece together puzzles scientists have been trying to solve throughout the cosmos. http://www.nasa.gov/sites/default/files/thumbnails/image/otispostcocrev2.jpg

U.S. Navy divers and other personnel in a rigid hull Zodiac boat have attached tether lines to a test version of the Orion crew module during Underway Recovery Test 5 in the Pacific Ocean off the coast of California. NASA and the U.S. Navy are conducting a series of tests to practice for recovery of Orion on its return from deep space missions. http://www.nasa.gov/sites/default/files/thumbnails/image/30660444486_d4a4e649d8_o.jpg

NGC 299 is an open star cluster located within the Small Magellanic Cloud just under 200,000 light-years away. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1642a.jpg