This NASA Hubble Space Telescope image of the Trifid Nebula reveals a stellar nursery being torn apart by a nearby massive star. Embryonic stars are forming within an ill-fated cloud of dust and gas, which is destined to be eaten away by the glare from the massive neighbor. Hubble/NASA
The setting sun and the thin blue airglow line at Earth's horizon was captured by the International Space Station's Expedition Three crewmembers with a digital camera. Some of the Station's components are silhouetted in the foreground. The crew was launched aboard the Space Shuttle Orbiter Discovery STS-105 mission, on August 10, 2001, replacing the Expedition Two crew. NASA
In this Apollo 17 onboard photo, Mission Commander Eugene A. Cernan adjusts the US flag deployed upon the Moon. The seventh and last manned lunar landing and return to Earth mission, the Apollo 17, carrying a crew of three astronauts: Cernan; Lunar Module pilot Harrison H. Schmitt; and Command Module pilot Ronald E. Evans, lifted off on December 7, 1972 from the Kennedy Space Flight Center. NASA
This awesome image depicts the full moon, sunset launch of the Space Shuttle Orbiter Atlantis STS-98 mission on February 7, 2001. The large white plume is the pillar of smoke and stream left behind by the solid rocket boosters. The very bright dot that exists above the plume is the flame still visible at the base of the rocket boosters. Patrick McCracken/NASA
This cutaway drawing was used by the Space Task Group to explain the Mercury ballistic capsule to visitors at the first NASA inspection, on October 24, 1959. NASA/LaRC
Astronaut John W. Young, commander of the Apollo 16 lunar landing mission, is photographed collecting lunar samples near North Ray crater during the third Apollo 16 extravehicular activity at the Descartes landing site. This picture was taken by Astronaut Charles M. Duke Jr., lunar module pilot. Young is using the lunar surface rake and a set of tongs. NASA
Astronaut Donald R. Pettit, Expedition Six NASA ISS science officer, photographed this view of a surface tension demonstration using water that is held in place by a metal loop. The experiment took place in the Destiny laboratory on the International Space Station. The Expedition Six crew was delivered to the station via the Space Shuttle Orbiter Endeavor STS-113 mission which was launched on November 23, 2002. NASA
This false color representation of Jupiter's Great Red Spot was taken through three different near-infrared filters of the Galileo imaging system and processed to reveal cloud top height. Images taken through Galileo's near-infrared filters record sunlight beyond the visible range that penetrates to different depths in Jupiter's atmosphere before being reflected by clouds. NASA/JPL
As the sun sets across the Alabama countryside, engineers at Marshall's Test Stand 116 perform an endurance test on a 750K experimental engine in 1996. NASA
This HiRISE image shows dark dunes and light polygonal terrain in Mars's Olympia Undae, also known as the North Polar Erg. Two sets of dunes are obvious. The origin of these channels is unknown, but they may result from the flow and displacement of sand that was fluidized by sublimating carbon dioxide or water frost. NASA/JPL/Univ. of Arizona
While officials agree that conditions are much improved in Sierra Leone, Liberia, and Guinea, it's unclear if this Ebola outbreak could have been responded to quicker, with less cost and suffering.
ByKrista Larson and Maria Cheng, Associated Press
A top U.N. official in the fight against Ebola greeted just three patients at one treatment center he visited this week in Sierra Leone. Families in Liberia are no longer required to cremate the remains of loved ones to halt the spread of the virulent disease.