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" ... In our everyday experience, light seems to travel in straight lines, unaffected by gravity. Of course, light can bend when it passes through the interface between two media — think of light refracting as is passes from air into water, which is the phenomenon that causes a straw in a glass of water to appear kinked at the interface. But that bending is not gravitational; it’s electromagnetic. ... "
" ... The James Lick Telescope - now the third largest refracting telescope in the world, behind Yerkes and the Swedish 1-meter solar telescope at the Roque de los Muchachos Observatory in La Palma, Spain - is still scanning the skies today, 130 years after its first light. Since then, astronomers have used the James Lick telescope to discover 25 comets and a new moon of Jupiter (which they named Amalthea), make spectroscopic observations of the Martian atmosphere, and study the relative motion of double stars: pairs of stars which appear very close to each other in the sky, either because they're actually binary pairs or because they just happen to align that way despite being very far apart. ... "
" ... The venue for Southern Geometries is the Fondation Cartier designed by Jean Nouvel, an archetypal “white cube” rendered as nearly transparent glass-box. Everything about the design of this building and its geometrically arranged glass panels, accentuates the rooms inside and the park outside. When Nouvel completed this architectural project in 1994, he extended the glass façade above the museum’s roof terrace and the glass walls beyond the building’s enclosure, creating extra tall glass planes in the foundation’s wild-flower garden. The architect Barbara-Ann Campbell enthused that this design lets any exhibition “slide into the [adjoining] park and vice versa. The building is a refracting series of superimpositions of sky, trees and reflected trees.” (Nouvel himself has referred to his building as the "Phantom in the Park.") This blurring of inside and outside is an important attribute since Southern Geometries uses the building’s architecture as a means to enhance the exhibition. ... "
" ... The way an electromagnetic signal works — whether you’re detecting it with a refracting lens, a reflecting dish, or a linear antenna — is straightforward: it spreads out in a spherical shape from its source. Because there’s a certain amount of inherent background noise to any observation you’d make, from both terrestrial and celestial sources, you need your signal to cross a certain threshold to be detectable, rising above the noise background. On the receiving end, that means larger detectors are better, while on the transmitting end, that means a higher-powered transmitter is better. ... "
" ... This illustration, with wildly incorrect distance scales, shows the principle of a space lens. The... [+] basic function of a space lens is to mitigate global warming, refracting sunlight away from the Earth. The actual lens needed would be smaller and thinner than what's shown here, and could be accomplished with a large array of small lenses instead of one enormous one. ... "