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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
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Galactic Center:
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The middle hub or nucleus of a galaxy. The
Milky Way’s galactic middle is about
28,000 light-years from Earth
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Gamma Rays:
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Light with the straight wavelengths and
the highest energies and frequencies in the
electromagnetic range; also called gamma radiation.
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Galaxy:
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A collection of stars, gas, and also dust
bound together by gravity. The smallest galaxies
might contain only a few hundred thousand
stars, while the main galaxies have thousands
of billions of stars. The Milky Way galaxy
holds our solar system.
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Geocentric:
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An adjective sense “centered on the
Earth.” Most early civilizations had
a geocentric view of the space.
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