Each pair is apparently a binary; but the period of revolution is unknown.
It is regarded as a binary of long and as yet unascertained period.
Antares is probably a binary, although its binary character has not yet been established.
It is only in the case of binary systems that we can discover the masses of stars at all.
The binary coloured systems are not all composed of blue and red suns.
There are nineteen in all and nearly half of them are binary systems.
Atoms cannot be enjoyed; the compounds are the binary and other combinations.
The family system is a combination of the solar and the binary systems.
Binary or multiple stars, which are extraordinarily numerous.
When two combinations are observed, they must be presumed to be a binary and a ternary.