Founded in 1996, the San Diego Association for Rational Inquiry (SDARI) serves the greater San Diego region by advocating critical thinking in our over-hyped, data-deficient world. Join us for monthly discussion and lecture groups on the 4th Sunday at the Joyce Beers Community Center in Hillcrest. We also do occasional social activities and are members of the San Diego Coalition of Reason.


We endeavor to encourage rational and scientific thinking by:

a) Serving as informational resource about paranormal and other extraordinary claims

b) Exploring paranormal and pseudoscientific claims responsibly and from a scientific point of view

c) Advocating and demonstrating the use of scientific inquiry in any activity as an alternative to science

d) Rationally examining paranormal and fringe-science claims; disseminating factual information about such claims and encouraging scientific and critical thinking regarding them.

About the background image:

Global Image of Io

(July 3, 1999) NASA's Galileo spacecraft acquired its highest resolution images of Jupiter's moon Io on July 3, 1999 during its closest pass to Io since orbit insertion in late 1995. This color mosaic uses the near-infrared, green and violet filters (slightly more than the visible range) of the spacecraft's camera and approximates what the human eye would see. Most of Io's surface has pastel colors, punctuated by black, brown, green, orange, and red units near the active volcanic centers. A false color version of the mosaic has been created to enhance the contrast of the color variations. The improved resolution reveals small-scale color units which had not been recognized previously and which suggest that the lavas and sulfurous deposits are composed of complex mixtures. Some of the bright (whitish), high-latitude (near the top and bottom) deposits have an ethereal quality like a transparent covering of frost. Bright red areas were seen previously only as diffuse deposits. However, they are now seen to exist as both diffuse deposits and sharp linear features like fissures. Some volcanic centers have bright and colorful flows, perhaps due to flows of sulfur rather than silicate lava. In this region bright, white material can also be seen to emanate from linear rifts and cliffs.

Comparison of this image to previous Galileo images reveals many changes due to the ongoing volcanic activity. North is towards the top of the picture and the sun illuminates the surface from almost directly behind the spacecraft. This illumination geometry is good for imaging color variations, but poor for imaging topographic shading. However, some topographic shading can be seen here due to the combination of relatively high resolution (1.3 kilometers or 0.8 miles per picture element) and the rugged topography over parts of Io. The image is centered at 0.3 degrees north latitude and 137.5 degrees west longitude. The resolution is 1.3 kilometers (0.8 miles) per picture element.

The images were taken on July 3, 1999 at a range of about 130,000 kilometers (81,000 miles) by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft during its twenty-first orbit. The Jet Propulsion Laboratory, Pasadena, California manages the Galileo mission for NASA's Office of Space Science, Washington, DC.

Image # : PIA02308
Text and image from:

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