Miracles And Tragedies Of Cosmic Proportions
my first year of college, after the spring semester bookstore post-rush dinner (which for some reason was held in may instead of february!), i was being driven back to campus by pat, our accountant, when all of a sudden i remembered something i had to do before it was too late. i looked up at the still-light sky so intently that my carmates must seriously have thought i was crazy. but it was, after all, the perfect evening to be craning my neck -- clear, relatively warm, and homework-free.
so i veritably raced into mcafee, where i frantically dialed my roommate and another friend (there were no cell phones in our lives then!), changed my jacket and shoes, and trotted to the observatory to ogle at mercury, venus, mars, jupiter and saturn all lined up in a row, visible with the naked eye and through the 6" refractor telescope.
that evening was amazing. i rediscovered for the 720th time just what a small speck earth is in the larger scheme of things. and boy, is it a large scheme. thanks for that headsup, DEL! a fabulous, annotated picture of what we saw -- minus the random man with binoculars -- is at:
<http://antwrp.gsfc.nasa.gov/apod/ap020429.html>
if i weren't such a dedicated english major and geoff groupie, i would quite readily admit that astro 101 was my favourite class in college. that said, i still think about star stuff often, and not just on clear nights at sea face park and the dome. and when someone recently commented on the stars, galaxies and cosmology textbook on my bookshelf, the refrain "the farther out you look in space, the further back you look in time" started to run through my head. i've lost a lot of the other detailed knowledge from 2002, but i'm still interested in knowing more about our place in the universe. which, as i said, is huge.
so anyway, i was quite disappointed to read of this loss:
Eye on Cosmos Is Lost to Short Circuit on Hubble
By DENNIS OVERBYE
Published: January 30, 2007
The Hubble Space Telescope is flying partly blind across the heavens, a result of a short circuit on Saturday morning in its most popular instrument, the Advanced Camera for Surveys.
NASA engineers reported yesterday that most of the camera’s capabilities, including the ability to take the sort of deep cosmic postcards that have inspired the public and to track the mysterious dark energy splitting the universe to the ends of time, had probably been lost for good.
In a telephone news conference, Hubble engineers and scientists said the telescope itself was in fine shape and would continue operating with its remaining instruments, which include another camera, the wide-field planetary camera 2, or wfpc2, and an infrared camera and spectrograph named Nicmos.
“Obviously, we are very disappointed,” Preston Burch, program manager for the telescope, said at the Goddard Space Flight Center in Greenbelt, Md., noting that the camera had basically met its five-year design lifetime. The Hubble telescope, Mr. Burch said, still has significant science capability.
Mr. Burch and his colleagues said it was unlikely that they would be able to repair the camera during the next Hubble servicing mission, which is scheduled for September 2008. On that mission, astronauts will replace the wide-field camera with a powerful new version, wfpc3, which will extend the telescope’s vision to ultraviolet and infrared wavelengths and restore the lost capabilities. They will also install a new ultraviolet spectrograph and make many other pressing repairs.
Noting that the five days of spacewalks for that mission were already full, and that changing things to fix the camera would cost time and money, Dr. Burch said, “At first blush, this doesn’t look attractive.”
The Advanced Camera for Surveys was installed on the telescope in March 2002, and it has been the space telescope’s workhorse. Among its feats, in 2003 the camera took the deepest photograph of the cosmos ever taken, the Hubble Ultra Deep Field, showing young galaxy fragments only one billion to two billion years after the Big Bang. In the most recent round of proposals from astronomers to use the telescope, about two-thirds required the advanced camera.
The camera had been operating on its backup electrical system since last summer, however, when electrical problems in its main system caused it to shut down for a while. Now the backup system has failed, dooming its ability to take wide-field or high-resolution images.
The camera may yet be operated in what the engineers called “solar blind mode,” at ultraviolet wavelengths to observe phenomena like auroras on Jupiter.
The electrical problems apparently did not spread to the rest of the telescope. Rick Howard, of NASA headquarters, said: “The fuse did what it was supposed to do. It saw a high current, and it popped. It protected the rest of the telescope.”
Astronomers said that the Space Telescope Science Institute had developed a contingency plan of observations that could go on without the camera and that there was no shortage of astronomers who would want to use it. Some of the telescope’s most crucial and high-visibility programs, however, will be delayed.
Adam Riess of the space telescope institute, who has used the Hubble telescope to search for supernova explosions in the distant universe to gauge the effects of dark energy on cosmic history, said these explosions would now be out of reach until the new camera was installed.
Still, Dr. Riess said in an e-mail message, it was a great camera. “Although it only lasted 4.9 years, it was only rated for 5 years,” he said, “so we really got our money’s worth.”
the famous hubble deep field image (warning: image may take a while to load) is at:
<http://www.firstpr.com.au/astrophysics/hubble-deep-field/hubble-deep-field-northern-detail-rw.bmp>
that is huge.
Labels: Life The Universe and Everything, NYT, Wellesley, Yay
