Not too sure about the eight groups.
The seven major groups are based on stellar type, which is based on temperature.
They are: O,B,A,F,G,K,M [See related question]
There are sub divisions, but they are rare and not part of the major groups.
In different groups
In different groups
There are constellations, groups of stars or star clusters that look like an animal/person/thing.
A example of an ophiuroidea is a sea star or a star fish. They are part of the five different echinoderm groups: Crinoidea, Asteroidea, Ophiuroidea, Echinoidea, Holothuroidea.
30C8 = 5,852,925
The answer is 8C6 = 8!/[6!*(8-6)!] where n! = 1*2*3*...*n So, the answer is 28.
It is stated that there are 440 different described species of sharks throughout the world. They are ordered into 8 primitive groups.
The Apache word for "star" is "díí'". Different Apache dialects may have variations in pronunciation or spelling, but "díí'" is commonly used among various Apache groups.
star fishes live in alone and in groups
24 groups of 8 = 192
The 8 groups of invertebrates are as follows: PoriferaCnidariaNemathelminthesPlatyhelminthesAnnelidaArthropodaMolluscaEchinodermata
Groups at different scales (from smaller to larger) are called:* Multiple stars (two or more stars that are gravitationally bound) * Star clusters * Galaxies * Galaxy clusters * Superclusters