The Apollo 9 Command/Service Modules, nicknamed 'Gumdrop,' and Lunar Module, nicknamed 'Spider,' are shown docked together as Command Module pilot David R. Scott stands in the open hatch. Astronaut Russell L. Schweickart, Lunar Module pilot, took this photograph of Scott during his EVA as he stood on the porch outside the Lunar Module in 1969. NASA/JPL
A small, dense object only 12 miles in diameter is responsible for this beautiful X-ray nebula that spans 150 light years. At the center of this image made by NASA's Chandra X-ray Observatory is a very young and powerful pulsar, known as PSR B1509-58, or B1509 for short. The pulsar is a rapidly spinning neutron star which is spewing energy out into the space around it to create complex and intriguing structures, including one that resembles a large cosmic hand. NASA/CXC/CfA/P. Slane et al.
The north polar layered deposits are layers of dusty ice up to 2 miles thick and approximately 620 miles in diameter. Seen in this image here, the layers exposed on the walls of troughs and scarps cut into the deposits, such as the trough wall. The bright region at the top is the flat surface above the trough wall; it is higher than the terrain underneath. The wall exposing these layers has a vertical relief of about 1970 feet. NASA/JPL/University of Arizona
In this image taken from video and made available by NASA, astronaut Douglas Wheelock, works on the International Space Station attempting urgent repairs to restore a crucial cooling system on Wednesday Aug. 11. The International Space Station has been operating with only half its usual cooling capability ever since an ammonia pump failed one-and-a-half weeks ago. Science research is on hold and unnecessary equipment is off until the pump can be replaced. The cooling system is crucial for keeping electronics from overheating. NASA/AP
The Apollo Command Module, used for the Skylab 3 mission in 1973, was moved successfully from the Glenn Research Center's Visitor Center to the Great Lakes Science Center in Cleveland, Ohio on June 22. The module will be the focal point of the Visitor Center, which includes space and aeronautics artifacts, models and interactive experiences. The move was carefully planned to protect and preserve the module, which weighs 12,800 pounds and is more than 11 feet tall and 13 feet wide. The module is on loan from the Smithsonian’s National Air and Space Museum. NASA
A Perseid meteor streaks above the skies of Palm Beach Gardens, Florida August 12, 2009. Doug Murray/Reuters/File
An Israel Aerospace Industries (IAI) instructor controls a drone at the coastal Ein Shemer air base near Hadera July 26. Worried by insurgent ambushes on its soldiers in Afghanistan and return fire that sometimes kills civilians or local allies, Germany last year ordered a small fleet of Israeli Heron spy drones designed to provide real-time images above a battlefield. That has brought German jet pilots to the air base for accelerated retraining on the unmanned propeller planes, already daubed with their flag and Iron Cross emblem. Nir Elias/Reuters
Dramatic plumes, both large and small, spray water ice out from many locations along the famed 'tiger stripes' near the south pole of Saturn's moon Enceladus. The tiger stripes are fissures that spray icy particles, water vapor and organic compounds. This mosaic was created from two high-resolution images that were captured by the narrow-angle camera when NASA's Cassini spacecraft flew past Enceladus and through the jets on Nov. 21, 2009. NASA/JPL/Space Science Institute
Every 27 years, a bright star called Epsilon Aurigae fades over period of two years, then brightens. Although amateur and professional astronomers have observed the system extensively, the nature of both the bright star and the companion object that periodically eclipses it have remained unclear. The companion is known to be surrounded by a dusty disk, as illustrated in this artist's concept. NASA/JPL-Caltech
This artist's concept illustrates the two types of spiral galaxies that populate our universe: those with central bulges (upper left), and those lacking the bulge (foreground). New observations from NASA's Spitzer Space Telescope provide strong evidence that the slender galaxies can, like their larger middle counterparts, harbor supermassive black holes at their cores. Previously, astronomers thought that a galaxy without a bulge could not have a supermassive black hole. In this illustration, jets shooting away from the black holes are depicted as thin streams. NASA
Federal prosecutors announced the indictment of a New York man on charges he was trying to recruit for the Islamic State. US officials say they are increasingly concerned about the possibility of a home-grown terror threat.