Binoculars have three main parts: the objective lens, prisms and the ocular lens. Binocular lenses are thicker in the middle and taper out to a thinner edge, which bends light toward the middle. These ...

I usually write about telescope dos and don’ts with telescopes around the holiday season, but I thought I’d write about it now for a change. After all, it’s a lot more comfortable this time of year ...

Extremely distant galaxies are usually too faint to be seen, even by the largest telescopes. But nature has a solution: gravitational lensing, predicted by Albert Einstein and observed many times by ...