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

 

O

Oceanus
An ocean.
Obliquity
The angle between a body's equatorial plane and orbital plane.
Occultation
The blockage of light by the intervention of another object; a planet can occult (block) the light from a distant star.
Old
A planetary surface that has been modified little since its formation typically featuring large numbers of impact craters; (compare to young).
Orbit
The path of an object that is moving around a second object or point.
Ovoid
Shaped like an egg.

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