Physical Constants & Classifications
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Astronomical Terms
1 AU (an “astronomical unit,” ~ the radius of the Earth’s orbit)150 million km, or about 93 million miles
1 parsec3.26 light years
apogee"highest" point in an orbit
perigee"lowest" point in an orbit
Note: a kilometer is equivalent to approximately 0.62 miles.


Primary Components of an Earth-type Atmosphere
Nitrogen78%
Oxygen21%
Argon0.9%
Carbon Dioxide0.04%


Star System Exploration Zones
ZoneNameAbbreviationSize
InnerLiquid WaterLWZ < 2 AU
Inner, ExtendedLWZ plus Asteroid BeltLWAZ< 4 AU
MiddleGas Giant ZoneGGZapprox. 4 - 30 AU
OuterKuiper Belt ZoneKBZapprox. 30 50 AU
Note: These are the default zones for a main-sequence, G-type star of about 1 solar mass. Strictly speaking, Gas Giants can occur anywhere in a stellar system. By convention, however, pilots tend to reference the zones of the Home System as shorthand for detailed assignments on their survey missions.


Asteroid Types
CarbonaceousC-type
SilicateS-type
Metal RichM-type
Basaltic (aka "Volcanic")B-type


© Michael C. Glaviano 2009 - 2016