Archives: Glossary: 691 terms

Voyager 1 spacecraft.

Voyager 2 spacecraft.

A gigantic cluster of over 2000 galaxies that is located mainly within the constellation of Virgo. This cluster is located ...

Wavelengths of electromagnetic radiation that are visible to the human eye.

A scale used by astronomers to measure the brightness of a star or other celestial object. Visual magnitude measures only ...

DSN Very Long Baseline Interferometry System.

A mountain or hill that has an opening where lava, rock fragments, or gas erupt from deep inside a planet ...

A spacecraft orbit that precesses, wherein the location of periapsis changes with respect to the planet's surface in a useful ...

The changing illumination of the Moon (or other body) over time. The Moon waxes, growing more illuminated, between its new ...

A way energy moves from one place to another. Sometimes waves move materials the way water ripples in a pond ...