Astronomy

Cosmic Background Explorer

United States satellite

Caloris

impact basin, Mercury

Very Large Array

telescope, New Mexico

Armillary Sphere

astronomy

Trumpler, Robert Julius

American astronomer

Luna-Resource

Description & Facts

Optical Telescope

History, Types, & Facts

Hydra

constellation

Clementine

spacecraft

Spicule

solar feature

Gordon, Richard F., Jr.

Biography, Gemini 11, & Facts

Almagest

Ptolemy, & Facts

Weight

physics

Anomaly

astronomy

Mohri Mamoru

Japanese astronaut

Supernova

Types, & Facts