Astronomy

Gemini Observatory

observatory and Chile

Vega

star

Facula

Definition & Facts

Solar Energy

Uses, Advantages, & Facts

Ishtar Terra

Venusian surface feature

Gravity Recovery and Climate Experiment

Earth-mapping mission

Supermoon

Definition & Facts

Sidereal Period

Definition & Facts

Midnight Sun

polar region phenomenon

Geminga

pulsar

Synchrotron Radiation

physics

Apollo 17

Overview & Facts

Musca

constellation

Andronicus Of Cyrrhus

Greek astronomer

Hamilton, Sir William Rowan

Irish mathematician and astronomer

Shen Kuo

Chinese astronomer, mathematician and official