Check out Phil Plait’s “Death from the Skies”. If I remember, correctly, a SN would have pretty grave consequences for life on Earth if it was within 30-50 light years of Earth when it went off. The muon flux could be devastating depending on how various magnetic fields (solar, Earth, other planets, cosmic, etc.) deflected incoming cosmic rays (or didn’t deflect them). Cosmic rays would strip ozone from the atmosphere. Losing ozone is not a good thing for life on Earth. Joan remembers when they took her favorite hair spray off the market because using it caused ozone damage She’s over it, now. However, I don’t think anything is that close (and slated to go off) that would be worrisome at this time for Earth. Maybe a few hundred million years from now. On the other hand, gamma ray bursts are much worse. If Earth were within a 1000 light-year radius of a gamma ray burst it would be 'adios amigos’. Again, muons would fry you. Even if you were underground or underwater. They’re very penetrating. All in all, not a good thing to be around a gamma ray burst. I’ll stick with my impending myocardial infarct for now. Dave
On Jun 23, 2015, at 15:35, Richard Tenney via Utah-Astronomy <utah-astronomy@mailman.xmission.com> wrote:
Great shot of the Patrick2 SN -- would hate to be anywhere near that star. Anyone know what the estimated kill radius is for a SN? What are the odds we'll find ourselves in one of those someday?/R From: Wiggins Patrick <paw@digis.net> To: Astronomy Utah <utah-astronomy@mailman.xmission.com> Sent: Monday, June 22, 2015 11:45 PM Subject: [Utah-astronomy] ISS to cross Sun / New SN image
CalSky is predicting ISS will transit the Sun Wednesday afternoon.
Here are the data for SPOC. Should be good to within a couple of seconds for northern SLC.
Crosses the disk of Sun. Transit duration=0.51s Angular diameter=65.6" size=109.0m x 73.0m x 27.5m Satellite at Azimuth=158.9° SSE Altitude= 71.8° Distance=421.2 km In a clock-face concept, the satellite will seem to move toward 9:33 Angular Velocity=60.0'/s
For those who have not seen an ISS transit before note the "Transit duration=0.51s" indicating ISS will only take about half a second to cross the Sun.
I've posted CalSky's map of the centerline. One must be within a couple of kilometers of the centerline to see any part of the transit. Best to be right on the centerline.
http://users.wirelessbeehive.com/~paw/temp/iss.jpg
+++++
In other news, here's an image I got of "my" supernova a few minutes ago. The SN is the tiny dot just above the core of the galaxy.
http://users.wirelessbeehive.com/~paw/temp/SN_.NGC_3888.2015JUN23.JPG
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