Class O type stars are the most luminous and massive main sequence stars in the galaxy. They range in mass from 15 to 90 solar masses and burn very brightly indeed, with a surface temperature reaching 52,000 K so appear very blue. They are very short lived with lifetimes of 1 - 10 million years, ending in supernova.
Class O star systems rarely contain terrestrial bodies. One of the most likely to host a stellar nursery.
Yes
Very Rare (~0.2%)
B
Class B stars are very luminous blue-white stars. They range in mass from 2 to 16 solar masses and have a surface temperature reaching 30,000 K. Their lifetimes are shorter than most main sequence stars.
Class B star systems rarely contain terrestrial bodies. One of the most likely to host a stellar nursery.
Yes
Rare (~1.7%)
A
Class A stars are hot white or bluish white main sequence stars. They range in mass from 1.4 to 2.1 solar masses and have a surface temperature reaching 10,000 K.
Class A star systems often contain high metal content worlds and metal-rich bodies.
Yes
Uncommon (~6%)
F
Class F stars are white main sequence stars. They range in mass from 1 to 1.4 solar masses and have a surface temperature reaching 7,600 K.
Class F star systems are one of the most likely to contain Earth-like worlds.
Yes
Common (~12%)
G
Class G stars are white-yellow main sequence stars. They range in mass from 0.8 to 1.2 solar masses and have a surface temperature reaching 6,000 K.
Class G star systems are one of the most likely to contain Earth-like worlds.
Yes
Common (~9%)
K
Class K stars are yellow-orange main sequence stars with a long and generally stable life. They range in mass from 0.6 to 0.9 solar masses and have a surface temperature reaching 5,000 K.
Class K star systems are the most likely to contain water worlds and rocky bodies.
Yes
Common (~25%)
M
Class M stars are red stars that form the bulk of the main sequence stars in the galaxy. Their mass is low, as is their surface temperature.
Class M star systems tend to contain many icy bodies and rocky ice worlds.
Yes
Very Common (~46%)
O-Type
B-Type
A-Type
F-Type
G-Type
K-Type
M-Type
L-Type
T-Type
Y-Type
PROTO
CARBON
WOLF-RAYET
WHITE DWARF
NON SEQUENCE