Standing on shoulders Both types of telescopes—Galileo's refractor ... that by using two different kinds of glass together in the objective lens, they could cause the red and blue ends of ...

The best telescopes allow you to observe the night sky in more detail. The best telescopes unlock the wonders of the night sky right from your backyard and beyond. Bring the Moon and planets into ...

There are two basic types of telescope: refractors and reflectors ... from a malaise known as chromatic aberration, in which different wavelengths of light are refracted to slightly different ...