Index

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 

G

Gaia Hypothesis
Named for the Greek Earth goddess Gaea, this hypothesis holds that the Earth should be regarded as a living organism. British biologist James Lovelock first advanced this idea in 1969.
Galilean Moons
Jupiter's four largest moons: Io, Europa, Ganymede and Callisto; discovered independently by Galileo and Marius.
Graben
An elongated, relatively depressed crustal unit or block that is bounded by faults on its sides.
Geosynchronous Orbit
A direct, circular, low inclination orbit in which the satellite's orbital velocity is matched to the rotational velocity of the planet; a spacecraft appears to hang motionless above one position of the planet's surface.
Granulation
A pattern of small cells seen on the surface of the Sun caused by the convective motions of the hot solar gas.
Greenhouse Effect
An increase in temperature caused when the atmosphere absorbs incoming solar radiation but blocks outgoing thermal radiation; carbon dioxide is the major factor.
Gravity
A mutual physical force attracting two bodies.
Genetic Mind
The genetic mind is the equivalent of a universal belief system that penetrates, to varying degrees, the human instrument of all entities.

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