IN discussing the significance of the two planet-like bodies which are now supposed to revolve around 61 Cygni and 70 Ophiuchi, Mr. Sen writes 1 that “we find that there can be at most two planetary ...

Sixty-one Cygni is a rather ordinary, fifth-magnitude star in the northern sky; its chief distinction is a planet about ten times as big as Jupiter. No one knows precisely what the inhabitants of that ...