Does our Sun have a counterpart, i.e., is it a part of a binary-system? If so, how does the other star look like and where is it?
Nemesis is a hypothetical companion to the Sun on a very eccentric, long-period orbit. The star supposedly returns every few tens of millions years, driving comets into the inner solar system and ...
Is it possible for two stars to exist close to each other? "Close" is relative; let's assume that two stars are close to each other if they are at the center of the same solar system. It's ...
I have a set of dates, position angles ($\theta$) and angular separations ($\rho$) for visual binary star. For example: ...
Suppose a telescope has aperture $D = 20$ cm. The angular resolution of such telescope, according to the Rayleigh criterion (if I have understood it correctly), is given by $$\theta = ...