Solard Death Ray: Power of 5000 suns! [SLYT]
The R5800: made from an ordinary fiberglass satellite dish, it is covered in about 5800 3/8" (~1cm) mirror tiles. When properly aligned, it can generate a spot the size of a dime with an intensity of 5000 suns! This amount of power is more than enough to melt steel, vaporize aluminum, boil concrete, turn dirt into lava, and obliterate any organic material in an instant. It stands at 5'9" and is 42" across.
posted by Fizz
on Jan 30, 2011 -
Year On Earth
breaks it down, explaining the complicated mechanics involved in trying to determine how long a year really is, why seasons and ice ages happen, and how not all years are created equal.
posted by loquacious
on Jul 5, 2010 -
The Thirteen Towers of Chankillo
in Peru may be the Western Hemisphere's oldest known full-service
solar observatory, showing evidence of early, sophisticated Sun cults
, according to archaeoastronomy
professor Clive Ruggles
. The 2,300-year-old complex featured 13 towers running north to south along a ridge and spread across 980 feet to form a toothed horizon that spans the solar arc
. Last year, another ancient observatory was discovered in Peru by Robert Benfer
. The Temple of the Fox
is 4,200 years old, making it 1,900 years older
than the Chankillo site, but wasn't a complete calendar.
posted by homunculus
on Mar 3, 2007 -
Because spaceflight, in and of itself, is just way to easy.
On 08 August 2001, NASA launched Genesis
. It was a spacecraft that would spend 1125 days in space, including 884 days collecting 0.4 milligrams of solar particles. At that point, it would launch a 500 lbs return vehicle that would travel 600 mph back to earth. When it enters the atmosphere, at approximately 11:55am EST on Wednesday of this week, it will be going close to twenty-five thousand
mph. Oddly enough, this is the easy part of the mission.
Because then, two minutes later, NASA is going to catch it. In mid-air. With a helicopter. Really.
posted by NotMyselfRightNow
on Sep 7, 2004 -
A very well designed site on the Analemma
. Don't be scared off by the math, as there are excellent diagrams and quicktime movies on this difficult to visualize phenomena. Difficult, but not impossible, to photograph (probably less than 10 photos are in existence) Ulrich Bienert
came close, and has a gallery and some tips if you're so inclined.
posted by quercus
on Aug 6, 2002 -