1999 RQ36 asteroid

Scientists on NASA's asteroid sample return mission, Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx), have

70 meter dish

Each Deep Space Network, or DSN, site has one huge, 230-foot (70-meter) diameter antenna. The 70-meter antennas are the largest and most sensitive DSN

Active Cavity Irradiance Monitor Satellite (AcrimSAT) (A)

ACRIMSAT studies the sun's energy output with uniform sensitivity to improve knowledge of the sun's role in global change.

Active Cavity Irradiance Monitor Satellite (AcrimSAT) (B)

ACRIMSAT studies the sun's energy output with uniform sensitivity to improve knowledge of the sun's role in global change.

Advanced Composition Explorer

Advanced Composition Explorer (ACE) observes particles of solar, interplanetary, interstellar, and galactic origins.

Advanced Crew Escape Suit

The Advanced Crew Escape Suit (ACES) is a full pressure vessel providing an atmosphere of protection.

Advanced Technology Large-Aperture Space Telescope (ATLAST)

The Advanced Technology Large-Aperture Space Telescope (ATLAST) builds upon key technologies developed for Hubble and Webb. ATLAST's large primary mirror

Aeronomy of Ice in the Mesosphere

AIM is a two-year mission to study Polar Mesospheric Clouds (PMCs), the Earth's highest clouds, which form an icy membrane 50 miles (80.4 km) above the

Agena Target Vehicle

Voyager probe B

NASA Voyager interstellar probe reference model.