GALAXIA (Program) - In preparation

Gamma Ray Imaging Payload (GRIP) - In preparation

Gamma Ray Research with balloons - In preparation

Gamma-Ray Arcminute Telescope Imaging System (GRATIS) - In preparation

GARP (Program)

GAY-LUSSAC, Joseph Louis (1778 - 1850) - In preparation

Geiger counter - In preparation

General Mills Inc - In preparation

GENETRIX (Program)

GHIELMETTI, Horacio S. (? - 1995) - In preparation

GLAISHER, James (1809 - 1903) - In preparation

Global Horizontal Sounding Technique (GHOST) - In preparation

GOES Data Collection System (GDCS)

Gondola - In preparation

GOPHER (Program) - In preparation

GRAB BAG (Program)

GRAY BACK (Program) - In preparation

GRAY, Hawthorne C. (1889 - 1927) - In preparation

GREISEN, Kenneth I. (1918 - 2007) - In preparation

G-Stack (Experiment) - In preparation

Guide Rope - In preparation

Gwiazda Polski (Star of Poland) - In preparation