astronomypictures

In earth's lower orbit

2011-02-05T22:48:00.000-08:00

Featured in this artist's illustration, NASA's NanoSail-D finally unfurled a very thin, 10 square meter reflective sail on January 20th, becoming the first solar sail spacecraft in low Earth orbit. Often considered the stuff of science fiction, sailing through space was suggested 400 years ago by astronomer Johannes Kepler who observed comet tails blown by the solar wind. Modern solar sail spacecraft designs, like NanoSail-D or the Japanese interplanetary spacecraft IKAROS, rely on the small but continuous pressure from sunlight itself for thrust. Glinting in the sunlight as it circles planet Earth, the NanoSail-D solar sail will periodically be bright and easily visible to the eye. In fact, skygazers are urged to participate in an ongoing contest to capture images of NanoSail-D. The images will help NASA monitor the satellite before it reenters the atmosphere in April or May.

Land of Mars

2011-02-05T22:41:00.000-08:00

Celebrating 7 years on the surface of the Red Planet, Mars exploration rover Opportunity now stands near the rim of 90 meter wide Santa Maria crater. Remarkably, Opportunity and its fellow rover Spirit were initially intended for a 3 month long primary mission. Still exploring, the golf cart-sized robot and shadow (far right) appear in the foreground of this panoramic view of its current location. The mosaic was constructed using images from the rover's navigation camera. On its 7 year anniversary, Opportunity can boast traversing a total of 26.7 kilometers along the martian surface. After investigating Santa Maria crater, controllers plan to have Opportunity resume a long-term trek toward Endeavour crater, a large, 22 kilometer diameter crater about 6 kilometers from Santa Maria. The rim of Endeavour is visible in the mosaic on the horizon at the right, just above the shadow of the rover's mast. During coming days, communication with the rover will be more difficult as Mars moves close to alignment with the Sun as seen from planet Earth's perspective.

International Space Station

2011-02-05T22:32:00.000-08:00

The care package from Earth had arrived. Last week, Japan launched the robotic Kounotori2 spacecraft to bring needed supplies, including food, to the International Space Station (ISS). Kountori2 launched from Japan's Tanegashima Space Center a little over a week ago reached the ISS in low Earth late last week. Pictured above, Kountori2 approached the ISS and was about to be grabbed by astronauts with the Canadarm2 and attached to the Harmony Module. In the above picture as seen through a window on the ISS, the limb of the Earth is visible, including white clouds, blue water, and various tan colored landforms. In addition to launches including humans, as many as ten robotic spacecraft may be launched to the space station this year, potentially including spacecraft from Russia, Europe, Japan, and a private company in the USA.

Apollo 14

2011-02-05T12:47:00.000-08:00

apollo 14: A View from Antares
Credit: Edgar Mitchell, Apollo 14, NASA; Mosaic - Eric M. Jones

Explanation: Forty years ago, while looking out the window of Apollo 14's Lunar Module Antares, astronaut Ed Mitchell snapped a series of photos of the lunar surface, assembled into this detailed mosaic by Apollo Lunar Surface Journal editor Eric Jones. The view looks across the Fra Mauro highlands to the northwest of the landing site after the Apollo 14 astronauts had completed their second and final walk on the Moon. Prominent in the foreground is their Modular Equipment Transporter (MET), a two-wheeled, rickshaw-like device used to carry tools and samples. Near the horizon at top center is a 1.5 meter wide boulder dubbed Turtle rock. In the shallow crater below Turtle rock is the long white handle of a sampling instrument, thrown there javelin-style by Mitchell. Mitchell's fellow moonwalker and first American in space, Alan Shepard, also used a makeshift six iron to hit two golf balls. One of Shepard's golf balls is just visible as a white spot below Mitchell's javelin.