virtual telescope

virtual telescope,

a computerized interferometer (see interferenceinterference,
in physics, the effect produced by the combination or superposition of two systems of waves, in which these waves reinforce, neutralize, or in other ways interfere with each other.
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) that merges the images from two or more telescopestelescope,
traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of
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 to obtain a single, large, enhanced image. The image in each telescope is made from electromagnetic waves (light waves from an optical telescope, radio waves from a radio telescope), each wave having peaks and valleys. Combining several waves into one makes the peaks higher and the valleys lower, resulting in a single, enhanced wave. This tends to make stars appear to be brighter and to increase the distances at which celestial objects can be studied. The peaks and valleys can also be made to cancel each other out (in a process called nulling interferometry) to permit the selective diminishment of the brightness of the light from a star so that, for example, a dimmer star or planet can be studied.
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The EHT links telescopes around the globe to form an Earth-sized virtual telescope with unprecedented sensitivity and resolution.
Together, they form a virtual telescope more than 12,000 kilometres across, the diameter of Earth.
Similarly, (https://www.virtualtelescope.eu/webtv/) the Virtual Telescope Project  is streaming the event live on its website.
While the asteroid is unlikely to be visible with the naked eye, The Virtual Telescope Project is hosting a free webcast of the event.
The Virtual Telescope Project will host a free webcast, led by astrophysicist Gianluca Masi in Ceccano, Italy, for the event.
By combining the signals detected by the individual antennas (the process called radio interferometry), you can synthesize a virtual telescope (aperture synthesis) that's as large as the distance between the dishes, albeit with a much lower sensitivity than a single huge instrument would have.
Michael Bremer, a space expert at the International Research Institute for Radio Astronomy (IRAM) and a project director for the Event Horizon Telescope clarifies that as opposed to building up a single telescope that can do this, cosmologists chose to go for the alternative of consolidating six telescopes to sort out a giant virtual telescope that is around 10,000 kilometers (6,200 miles) in measurement, PM cited.
"It's going to look like a simple shed," Morgan said minutes before a ceremonial groundbreaking for what he said will be the only virtual telescope in America.
Free webcasts, offered by Slooh and Virtual Telescope Project, streamed live shows of Apophis from telescopes in Italy and Canary Islands.
Another European player is the Virtual Telescope Project, with 14- and 17-inch scopes in south-central Italy.
They will do it with a virtual telescope spanning the globe, electronically roping together scores of smaller instruments at observatories that usually operate independently.
Combining the signals from each of these telescopes using a supercomputer 100 times more powerful than anything that exists today will create a virtual telescope, spanning 3 000 km in diameter, with a total collecting area of one square kilometre--the equivalent of over a million DSTV satellite dishes.

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