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Young Men and Fire: Timothy Egan’s “The Big Burn”

By Jenny Shank

A female grizzly bear and her three large cubs pause in a secluded meadow along Montana's Rocky Mountain Front near Dupuyer Creek. Biologists estimate that as many as 70 to 80 grizzlies may inhabit the high plains east of the Front. Photo courtesy of Mike Madel, Montana Fish, Wildlife and Parks. Grizzlies On the Move, Back to the Wide-Open Prairie

By Jason D.B. Kauffman

BLM photo Interior, Forest Service Buy Key Private Land Holdings

By David Frey

Downtown Boise. Commercial Real Estate Outlook Darkens

By Jonathan Weber

Comments

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By Sisyphus, 8-06-07
As always, very informative. Thanks Irwin.
By Randy Holst, 8-06-07
Irwin,

If a black hole is at the center of our galaxy and a star gets too close to it and gets torn apart and sucked in, how is any light or radiation able to escape the gravitational pull of the black hole?

Randy Holst
By 6degrees, 8-07-07
Randy,

First, when such an event occurs, the star doesn't fall straight into the black hole, as it is necessary to conserve angular momentum. Instead, it orbits the BH while tidal forces stretch and contort the dying star, pulling off material which forms an accretion disk around the BH. As this material spirals inward due to friction (a mechanism which allows it to transfer that angular momentum outwards), it gets heated to extremely high temperatures, resulting in the generation of a great deal of high energy photons (x-ray and gamma ray) as well as charged particles like electrons and positrons (anti-electrons). The BH very likely possesses a powerful magnetic field, which causes these charged particles to be channeled into beams of radiation shooting out along the axis of that field.

Until the stellar material reaches the event horizon of the BH (where the escape velocity equals the velocity of light), the light and particles it generates are still able to escape and be observed by someone located far away from all that action...like us!
By J. Gelband, 8-08-07
You are so much cooler than my astrology 101 professor in college. Thanks for the update, Irwin.
By J. Gelband, 8-08-07
No wait, I meant astronomy.

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