Ground-based telescopes are constructed that detect light in either the visible or radio wavelengths corresponding to the optical windows of our atmosphere. Optical telescopes are typically used in conjunction with electronic cameras called <1> or spectrographs which spread out the different wavelengths of light. Radio telescopes are used because of their ability to map the location of cool clouds of <2> and make observations through <3>. The largest radio telescope in the world is found at <4>. Radio telescopes are often connected to form interferometers.
Although solid mirrors can be made much more easily today through the process known as <5> than in the past, there are still engineering problems related to supporting their tremoundous weight. Thus, most large telescopes make use of either segmented mirrors or <6> mirrors. For example, the Keck telescopes on Mauna Kea make use of <7> mirrors. Most large telescopes are also attempting to make real-time corrections for atmospheric turbulence in a process known as <8>. The future of large telescopes may involve liquid mirror telescopes where the mirror is a spinning basin of <9>.
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