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Phoenix landing preview

Less than two weeks before the Phoenix spacecraft arrives at Mars, this previews the landing and the planned science on the planet's surface.

 Presentation | Q&A

STS-82: In review

The second servicing of the Hubble Space Telescope was accomplished in Feb. 1997 when the shuttle astronauts replaced a pair of instruments and other internal equipment on the observatory.

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STS-81: In review

The fifth shuttle docking mission to the space station Mir launched astronaut Jerry Linenger to begin his long-duration stay on the complex and brought John Blaha back to Earth.

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Discovery rolls out

Discovery travels from the Vehicle Assembly Building to pad 39A in preparation for the STS-124 mission.

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STS-124: The programs

In advance of shuttle Discovery's STS-124 mission to the station, managers from both programs discuss the flight.

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STS-124: The mission

A detailed preview of Discovery's mission to deliver Japan's science laboratory Kibo to the station is provided in this briefing.

 Part 1 | Part 2

STS-124: Spacewalks

Three spacewalks are planned during Discovery's STS-124 assembly mission to the station.

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STS-124: The Crew

The Discovery astronauts, led by commander Mark Kelly, meet the press in the traditional pre-flight news conference.

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Discovery to VAB

For its STS-124 mission, shuttle Discovery was transferred from its hangar to the Vehicle Assembly Building for attachment to a fuel tank and twin solid rocket boosters.

 Transfer | Hoist

Complex 40 toppling

The Complex 40 mobile service tower at Cape Canaveral's former Titan rocket launch pad was toppled using explosives on April 27.

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Building 'super roadmaps' of planets and moons
ROCHESTER INSTITUTE OF TECHNOLOGY NEWS RELEASE
Posted: May 15, 2008

Technology that could someday "MapQuest" Mars and other bodies in the solar system is under development at Rochester Institute of Technology's Rochester Imaging Detector Laboratory (RIDL), in collaboration with Massachusetts Institute of Technology's Lincoln Laboratory.

Three-Dimensional "super roadmaps" of other planets and moons would provide robots, astronauts and engineers details about atmospheric composition, biohazards, wind speed and temperature. Information like this could help land future spacecraft and more effectively navigate roving cameras across a Martian or lunar terrain.

RIT scientist Donald Figer and his team are developing a new type of detector that uses LIDAR (LIght Detection and Ranging), a technique similar to radar, but which uses light instead of radio waves to measure distances. The project will deliver a new generation of optical/ultraviolet imaging LIDAR detectors that will significantly extend NASA science capabilities for planetary applications by providing 3-D location information for planetary surfaces and a wider range of coverage than the single-pixel detectors currently combined with LIDAR.

The device will consist of a 2-D continuous array of light sensing elements connected to high-speed circuits. The $547,000 NASA-funded program also includes a potential $589,000 phase for fabrication and testing.

"The imaging LIDAR detector could become a workhorse for a wide range of NASA missions," says Figer, professor in RIT's Chester F. Carlson Center for Imaging Science and director of the RIDL. "It could support NASA's planetary missions like Europa Geophysical Orbiter or a Mars High-resolution Spatial Mapper."

LIDAR works by measuring the time it takes for light to travel from a laser beam to an object and back into a light detector. The new detector can be used to measure distance, speed and rotation. It will provide high-spatial resolution topography as well as measurements of planetary atmospheric propertiesópressure, temperature, chemical composition and ground-layer properties. The device can also be used to probe the environments of comets, asteroids and moons to determine composition, physical processes and chemical variability.

Working with Figer are Zoran Ninkov and Stefi Baum from RIT and Brian Aull and Robert Reich from Lincoln Laboratory. The team will apply LIDAR techniques to design and fabricate a Geiger-Mode Avalanche Photodiode array detector. The device will consist of an array of sensors hybridized to a high-speed readout circuit to enable robust performance in space. The radiation-hard detector will capture high-resolution images and consume low amounts of power.

The imaging component of the new detector will capture swaths of entire scenes where the laser beam travels. In contrast, today's LIDAR systems rely upon a single pixel design, limiting how much and how fast information can be captured.

"You would have to move your one pixel across a scene to build up an image," Figer says. "That's the state of the art of LIDAR right now. That's what is flying on spacecraft now, looking down on Earth to get topographical information and on instruments flying around other planets."

The LIDAR imaging detector will be able to distinguish topographical details that differ in height by as little as one centimeter. This is an improvement in a technology that conflates objects less than one meter in relative height. LIDAR used today could confuse a boulder for a pebble, an important detail when landing a spacecraft.

"You can have your pixel correspond to a few feet by a few feet spatial resolution instead of kilometer by kilometer," Figer says. "And now you can take LIDAR pictures at fine resolutions and build up a map in hours instead of taking years at comparable resolution with a single image."

The imaging LIDAR detector will be tested at RIDL in environments that mimic aspects of operations in NASA space missions.

In addition to planetary mapping, imaging LIDAR detectors will have uses on Earth. Other applications include remote sensing of the atmosphere for both climate studies and weather forecasting, topographical mapping, biohazard detection, autonomous vehicle navigation, battlefield friend/foe identification and missile tracking, to name a few.

"There is an increasing demand for highly accurate three-dimensional data to both map and monitor the changing natural and manmade environment," says Ninkov, professor of imaging science at RIT. "As well as spaceborne applications there are terrestrial applications for LIDAR systems such as determining bridge heights, the condition of highways and mapping coastal erosion as sea heights rise."