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by Watsisname
14 Aug 2020 03:44
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 302765

Astrophotography

34294 Here is what was really unusual- they seemed really low, maybe only a couple of hundred feet above the trees Your eyes deceive you. :) You were seeing them at more like a couple hundred thousand feet. People often misjudge how far away meteors are, thinking they are "just over those tree...
by Watsisname
05 Aug 2020 05:00
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 1037
Views: 220399

Totally off-topic thread

34247 Am I missing something but doesn't it need to be combined with a fuel to be explosive? My understanding is ammonia nitrate is just an oxidizer? You're correct that it's not explosive on its own. But being a strong oxidizer that is explosive when mixed with fuels is precisely the problem. If i...
by Watsisname
05 Aug 2020 00:50
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 1037
Views: 220399

Totally off-topic thread

I suppose most have heard this news by now... k51L0MkRO8E Just awful. Eerily similar to the  1947 Texas City disaster  (also caused by about 2000 tons of ammonium nitrate). Or for that matter, Oppau in 1921, and many other examples. When will people stop storing massive quantities of highly explosiv...
by Watsisname
04 Aug 2020 04:20
Forum: Off-topic Discussions
Topic: Topic for Music Lovers
Replies: 143
Views: 59711

Topic for Music Lovers

Some more spacerock. \m/



by Watsisname
26 Jul 2020 19:36
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 432
Views: 111859

Show off your work

That magical hour of an alpine dawn. https://i.imgur.com/oAlPOXS.jpg https://i.imgur.com/CxlFb3V.jpg https://i.imgur.com/qz30hf7.jpg And a furry little friend sharing the summit. https://i.imgur.com/OXZYhr1.jpg https://i.imgur.com/Twg6C7B.jpg
by Watsisname
24 Jul 2020 18:10
Forum: Space Journeys
Topic: Image Dump
Replies: 2782
Views: 486817

Image Dump

Wow, Aborygen, I love the volcanic eruption. :)
by Watsisname
20 Jul 2020 17:29
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 432
Views: 111859

Show off your work

Great pictures, that soft and shallow angle lighting on them is perfect! Over here in the San Juan Islands, a huge part of the Puget Sound flows through a narrow gorge called  Deception Pass  with the tide cycle, and the currents can peak at around 15kph forming similar whirlpools. It's amusing to w...
by Watsisname
19 Jul 2020 13:53
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 211
Views: 24400

Coronavirus (COVID-19) Thread

34158 Those later R numbers for Norway are significantly higher than what authorities here have been presenting. Early, however, R was assumed to be higher ( >2).  Yet with relatively modest measures it quickly dropped below 1.  Indeed, our models and they data they are based on are very different,...
by Watsisname
19 Jul 2020 04:20
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 211
Views: 24400

Coronavirus (COVID-19) Thread

34152 But how did the US come to this point? I think a good way to see what happened in the US is to derive the value of R (the average number of people an infected person transmits the virus to) as a function of time for the US, and compare to other countries. Here's the curve (dashed purple) for ...
by Watsisname
18 Jul 2020 23:53
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 484
Views: 89348

Astrophotography

The dusty tail of NEOWISE is definitely growing fainter and less impressive, but at the same time it is getting higher and farther from the twilight, and its green coma and faint blue ion tail are becoming easier to see. :) 

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by Watsisname
16 Jul 2020 22:36
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 211
Views: 24400

Coronavirus (COVID-19) Thread

As someone who has been following the testing and contact tracing effort in the US very closely, and with growing alarm at how quickly it has fallen apart in many states, I think this rings true. Rockefeller Foundation National Testing and Tracing Plan  https://i.imgur.com/rCkYXq8.png
by Watsisname
16 Jul 2020 18:59
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 432
Views: 111859

Show off your work

34103 Best one I ever found was this one of what I am 90% certain is natrolite. Definitely has the look and habit of natrolite! Awesome find. I love crystals that radiate like that. :) My summer of rockhounding continues, this time to the eastern side of Washington, in search of my birthstone: garn...
by Watsisname
16 Jul 2020 18:37
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 484
Views: 89348

Astrophotography

34143 I saw a graphic that shows it will be 35 degrees above the horizon in NY on Jul 30, but will it be 3rd mag or brighter at that point?  ¯\_(ツ)_/¯   Comet magnitudes are notoriously unpredictable. We expect  it to fade to around magnitude 5 or 6 by July 30th, but it could brighten suddenly, or ...
by Watsisname
16 Jul 2020 01:57
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 484
Views: 89348

Astrophotography

34140 Wat, how bright is this compared to Hale-Bopp in 1997?  I remember seeing that comet clearly from NYC! Not as bright as Hale-Bopp. You can probably spot the small bright fuzzy dot of the coma of NEOWISE from within a city with binocs, but otherwise to enjoy seeing the whole thing with the nak...
by Watsisname
11 Jul 2020 05:15
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 484
Views: 89348

Astrophotography

Comet C/2020 F3 (NEOWISE), a few hours ago. I would rate this the best comet I have seen visually since Hale-Bopp in 1997.

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