Archives: Glossary Terms: 691 terms

A shallow crater with a complex, scalloped edge.

The Mars Environmental Survey (MESUR) engineering prototype later named Mars Pathfinder.

Planetary Data System.

Pacific Daylight Time.

Post Encounter phase in flyby mission operations.

The area of partial illumination surrounding the darkest part of a shadow caused by an eclipse.

A penumbral lunar eclipse occurs when the Sun, Earth, and the Moon align in an almost straight line.

The point in an orbit closest to the body being orbited.

Periapsis in Saturn orbit.

Periapsis in Earth orbit.