Large Binocular Telescope Part 1
Thursday, December 24th, 2009 at
4:14 am
In Part I of the LBT, iMix visits the Large Binocular Telescope Observatory high atop Mt. Graham outside of Safford, AZ. Here at the largest telescope in the world, Ohio State University faculty a...
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The BBC broadcast a 30min radio programme on the LBT. Nice to see it,
Looking for God or scared of planet XCheck out Mount Graham Telescope at the University of Arizona’s Seward Observatory outside Tucson. The Vatican co -owns this! McCain in 1988 gave the green light to illegal logging in the wildlands of Idaho for the construction of the Mount Graham telescopes, shielding them from any kind of litigation by environmentalists or Apaches. The bill passed in the dead of night giving astronomers the right to move forward “even if it killed every squirrel”.
ED HARDY MINI DRESS LARGE
NIKON 7294 Monarch III 8×42 Binocular
by Nikon
Date first available at Amazon.com: January 18, 2010
Buy new: $420.95 $279.95
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(Ranking is updated hourly. Visit the Hot New Releases in Camera & Photo list for authoritative information on this product’s current rank.)
Hi. The optics should be the best you can afford. The camera should have as many megapixels as possible. This unit has 5 megapixels. On the cheapest (not recommended) side of the scale are units like this.
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From what I’ve heard them say it does
A single-dish radio telescope is usually an antenna shaped as a parabola that collects the radio waves from a celestial object and focuses them onto a receiver. The signal received is then electronically processed so that it can be stored and analysed by a computer. The telescope has to have two important characteristics to be really effective and allow one to detect faint and distant celestial objects: it should have a large collecting area (large telescopes can collect more electromagnetic waves and therefore detect fainter objects) and the resolution (how close things can be together and still be distinguished as separate) should be as good as possible. The high resolution is a very important point for radio astronomy. A big telescope can better separate objects that are close together. However, size in meters is not the whole story: the diameter of the telescope should also be many times (as many as possible!) greater than the wavelength of the radiation it detects. In other words, the longer the wavelength of the radiation that we radio astronomers want to receive, the larger the telescope has to be in order to have the same resolution. An optical telescope with a diameter of 10 cm already gives the best resolution obtainable from the ground due to the effect of the atmosphere: such a telescope gives a resolution of about 1 arcsec which means it will be able to separate two people 1 meter apart at the distance from Groningen to Amsterdam (about 200 km). On the other hand, a parabola of 30 metre (quite typical for a single-dish radio telescope) will separate the two people only if they are 60 metre apart. So to get the same resolution as obtained from the optical telescope we need a parabola of more than 1 km: something that is impossible to build with the current technology! This has been a big limitation for single-dish radio telescopes and they are at most the size of 100 m (with the exception of the 300 m antenna in Arecibo, that, however, being built in a valley cannot move and can track objects only over a small part of the sky). For a long time, at the beginning of radio astronomy, this was the main limitation: it was not possible to obtain information about celestial objects comparable to what the optical telescopes were getting. In particular, it was very difficult to identify which object in the sky seen by optical telescopes was actually emitting radio emission, because the resolution of the radio telescopes was so poor.
L’audience de la Ferme Célébrités 3 va très mal. Cette…
A few points here. Magnification is the enemy of stable views. 7×50 are generally considered the "standard" astro size but older people (mid thirties upwards) do not have eyes that can take in all the light they give. There are two alternatives to that – go up in magnification (usually to 10x) or down in aperture (e.g. to 42mm). 10×50s are often quoted as the way to go for this reason but that is too powerful for many people to hold hand held – a pair of 7×42s or 8×42s may be a better bet.
A bino mount is one option, but that loses the fundamental portability advantage of binos. If you are going to start erecting a mount in my view you may as well set up a telescope.
Alternatively, you might want to consider image stabilised binos. I have a pair of Canon 12×36s here that are image stabilised and are absolutely wonderful in use – it is difficult to compare them to regular binos in that they are effectively a completely different class of instrument. Alas, they are not cheap – that pair cost me £450 maybe six months ago. You can get a fairly good scope for that much, although they are not particularly expensive when compared to traditional binos of comparable optical quality.
AVA-it's hurtRT #nowplaying AVA-letters to God part 2