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development schedule and capped life-cycle costs. The first two such missions, the Vegetation Canopy Lidar and the Gravity Recovery and Climate Explorer, are scheduled for launch in 2000 and 2001, respectively.

e/bit

electrons per bit.

G

GaAs/Ge

Gallium arsenide/germanium: Semiconductors used in the construction of solar arrays.

GFO

Geosat Follow-On mission.

H

HgCdTe

A type of infrared array detector composed of an alloy of mercury (Hg), cadmium (Cd), and tellurium (Te).

I

ICBM

Intercontinental ballistic missile.

InSb

A type of focal-plane array used for sensing near-infrared radiation composed of indium (In) and antimony (Sb).

IPDT

Integrated product development team.

IUS

Inertial Upper Stage.

J

JPL

Jet Propulsion Laboratory.

L

LEAP

Lightweight Exo-Atmospheric Projectile.

Lidar

Light identification, detection, and ranging.

LMLV

Lockheed Martin Launch Vehicle.

LMLV2

Second-generation Lockheed Martin Launch Vehicle.

LOSAT-X

SDIO experimental satellite.

Lunar Prospector

NASA's third Discovery mission, a small lunar orbiter scheduled for launch in October 1997 (see Table 3.1).

M

Magellan

The first Shuttle-launched interplanetary spacecraft. Following its launch from Atlantis in 1989, Magellan mapped almost all of Venus's surface using synthetic aperture radar and conducted measurements of the planet's gravitational field.

Mars Observer

The first and last of NASA's Planetary Observer series. It was launched in 1992 and was lost shortly before entering orbit around Mars in 1993.

Mars Pathfinder

Formerly known as the Mars Environmental Survey (MESUR) Pathfinder, this spacecraft is one of the first two Discovery missions and was launched in December 1996. The mission consists of a lander and a surface rover, ''Sojourner" (see Table 3.1).

Mars Surveyor

A continuing line in NASA' s budget dedicated to the launch of two small- to intermediate-sized Mars missions at every launch opportunity (every 26 months) between 1996 and 2005. The first Surveyor mission, Mars Global Surveyor, was launched in November 1996 and is expected to arrive at Mars in September 1997.

MGS

Mars Global Surveyor: The first of NASA's Mars Surveyor missions.

MidEx

Mid-sized Explorer: A continuing line in NASA's budget dedicated to low-cost (<<$70 million) missions in space physics and astrophysics.

Milstar Military Star:

A series of large military communications satellites.

MIPS

Million instructions per second.

MISR

Multi-Angle Imagery Spectral Radiometer.

MMH

Monomethyl hydrazine.

MSTI

Miniature Seeker Technology Integration.

N

NEAR

Near-Earth Asteroid Rendezvous: One of NASA's first two Discovery missions, it was launched in February 1996 and will rendezvous with 433 Eros in January 1999 (see Table 3.1).

NRL

Naval Research Laboratory.



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