The Great Ptolemaic Smackdown
is a nine-part series posted by sci-fi author and statistician Michael F. Flynn
to his blog last year, covering the historical conflict between heliocentrism and geocentrism, with a special focus on Galileo. They are based on an article (pdf)
by Flynn which originally appeared in the Jan/Feb 2013 issue of Analog
. [more inside]
posted by zarq
on Apr 8, 2014 -
Missed the transit of Venus in 2004? Want to know if you'll be able to see the transit on June 5/6 from your location? Want a free badge-of-geekhood app for your iPhone? It's all right here! [more inside]
posted by Quietgal
on Jun 1, 2012 -
Boston telegraph operator, (to Portland telegraph operator): "Please cut off your battery entirely from the line for fifteen minutes."
Portland operator: "Will do so. It is now disconnected."
Boston: "Mine is disconnected, and we are working with the auroral current. How do you receive my writing?"
Portland: "Better than with our batteries on. Current comes and goes gradually."
Boston: "My current is very strong at times, and we can work better without the batteries, as the Aurora seems to neutralize and augment our batteries alternately, making current too strong at times for our relay magnets. Suppose we work without batteries while we are affected by this trouble."
Portland: "Very well. Shall I go ahead with business?"
Boston: "Yes. Go ahead." — Ars Technica covers the story of the Great Auroral Storm of 1859, and the awe it inspired.
posted by Toekneesan
on May 3, 2012 -
The Sun has been in a bit of a mood lately, spitting out some pretty big flares
(including the second largest one of the current magnetic cycle)
Be sure to scroll down for the photo of the entire Sun, it will change the way you think about it.
posted by HuronBob
on Mar 15, 2012 -
The Midnight Sun is a natural phenomenon that occurs in the summer months near the Arctic and Antarctic Circles, where the sun remains visible at the local midnight. This short, time lapse film was shot in June 2011 over 17 days and incorporates 38,000 images. The photographer/videographer traveled over 2,900 miles throughout Iceland. Midnight Sun (SL-vimeo, via) [more inside]
posted by zarq
on Oct 18, 2011 -
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 -
As the shuttle program winds down, astrophotographers like Thierry Legault are taking advantage of these last opportunities to capture absolutely incredible shots like this one
, showing Atlantis' transit in front of the sun as it performs its inspection backflip before docking with the ISS. His other photography includes this magnificent series
of the launch of STS-125
. [more inside]
posted by disillusioned
on May 19, 2010 -