Wednesday, January 06, 2010

The universe: spatially and temporally.

In The Restaurant at the End of the Universe, the second volume of Douglas Adams's Hitchhiker series, Zaphod Beeblebrox, as punishment for his theft of the Heart of Gold spaceship, is put into the Total Perspective Vortex, supposedly the most fiendish torture device ever made:

When you are put into the Vortex you are given just one momentary glimpse of the entire unimaginable infinity of creation, and somewhere in it a tiny little mark, a microscopic dot on a microscopic dot, which says, "You are here."
Zaphod is able to survive the Vortex with his sanity intact because his ego is robust enough to conclude that the "You are here" marker means that he is the most important thing in the universe, the whole vastness of which was made specially for him.

The American Museum of Natural History has produced a video that, while not having the intended impact of the Vortex, nevertheless gives a sense of the immensity of the known universe (double click twice on the video to bring it to full screen size for maximal effect):


As the text on the video notes, our view of the known universe has a temporal as well as a spatial dimension. Because light travels at a finite speed, light from distant objects reaches us some time after it originated. When we look at Alpha Centauri, the nearest star, we are seeing it as it was about four and a half years ago. As we've developed more powerful telescopes, we've expanded our temporal as well as our spatial horizon, looking farther and farther back in time. Below is an image taken by the Hubble Space Telescope, in which the circled objects are the most distant galaxies yet detected.

As detailed in this NASA web page, the faint galaxies in this image are about 13 billion light years away, which means we are seeing them as they were six to eight hundred million years after the Big Bang.

Thanks to Geoff Abrams for forwarding the AMNH video.

Tuesday, January 05, 2010

Let the Art Institute of Chicago help you with your resolutions.


I'm not one for resolutions. As my wife sometimes says (usually as I'm pouring my ill-advised second helping of Cognac): "You have the willpower of a gnat." Nevertheless, I'm glad to see as distinguished an organization as the Art Institute coming to the aid of those who wish to start the new year, indeed decade, off in good form. As a guide to what should be resolved against (or, according to one of my Facebook friends, in favor of), the Institute has mounted an exhibit of paintings and sculptures illustrating the Seven Deadly Sins, beginning with Lust (see Titian's Danaë--possibly the first-ever recipient of a golden shower--above). For those of you not willing to brave a trip to Chicago in the winter (my friend Marian Saska can give you the chilling details of the winter of 1979 there), the guide to the complete exhibit, with images of the art works, can be seen on-line here.