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The candidates are a metal mirror made of beryllium or one made of some form of glass.
Dr. Melosh suggests exploring other options, and favors positioning a giant parabolic mirror made of reflective fabric material near the threatening asteroid.
Last year they published a 300-page "conceptual design" for a 30-meter telescope with a mirror made of some thousand hexagons.
His largest instrument, too cumbersome for regular use, had a mirror made of speculum metal, with a diameter of 122 centimetres (48 inches) and a focal length of 12 metres (40 feet).
In 1839 Rosse built a 36-inch (91-cm) reflecting telescope, with the mirror made of polished metal, and then, in 1845, the 72-inch (183-cm) "Leviathan of Parsonstown".
Known as Observatory House, its largest instrument had a mirror made of speculum metal, with a diameter of 122 cm (48 inches) and a focal length of 17 metres (40 feet).
Similar(44)
Other design imperfections include an artsy visor that's too small to block the sun and mirrors made of fun-house plastic rather than, well, glass.
The system uses extremely light mirrors, made of aluminum thinner than that of a soft drink can, sheltered in greenhouses to keep them out of the wind and dust.
Such "microbubbles" are essentially "mirrors made of air," says Seitz, and they might be created off boats by using devices that mix water supercharged with compressed air into swirling jets of water.
The cephalopods, including squid, octopus and cuttlefish, have multi-layer mirrors made of protein rather than guanine.
A much-discussed aspect was the presence of numerous small mirrors made of Belgian glass, which were crafted and designed by workers from Firozabad.
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