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 ...
I have a set of dates, position angles ($\theta$) and angular separations ($\rho$) for visual binary star. For example: ...
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 ...
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 = ...