the-eldest-woman-on: Cloud Ripples W/Sun Dog During Rocket…

Friday, July 31st, 2015


Cloud Ripples W/Sun Dog During Rocket Launch
Taken by Robin Bozza on February 23, 2010 @ CCAFS in Florida

My online friend Barbara Tomlinson was in the viewing area for this launch; here’s the video she made. The rocket going supersonic made visible ripples in the suspended ice crystals of the cloud, until the expanding ripples obliterated the sun dog (around 1:58 in the video). The crowd reaction is fun.

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A view no one has ever seen before: Saturn’s complete disk,…

Thursday, October 17th, 2013

A view no one has ever seen before: Saturn’s complete disk, separate from its rings. It was created by Croatian software developer and amateur astrophotographer Gordan Ugarkovic, who combined a 3×4 mosaic of raw Cassini images taken October 10, 2013.

More details from Emiky Lakdawalla’s blog at the Planetary Society: One for the history books.

The more I look at it the more cool things there are to notice: The hard-edged shadow on the rings (because the sun doesn’t subtend the half-degree of arc that it does from the Earth and Moon, leading to an ever-so-slight gradation at the edge of lunar shadows from the partially eclipsed solar disk). The hexagonal feature at Saturn’s pole. The illumination on Saturn’s night side from the ring itself, and the way it fades near local midnight (because of the planet’s shadow on the rings) and near the equator (because from there the rings go edge-on and disappear from the perspective of an observer on Saturn’s surface).

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