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by Watsisname
19 Sep 2020 14:50
Forum: Science and Astronomy Discussions
Topic: Population Growth and Sustainable Development
Replies: 65
Views: 8133

Population Growth and Sustainable Development

34546 Thanks guys!  How do you feel about Thorium? I feel quite positive about it! This PBS Space Time episode has a great overview of the technology and what makes it so much safer, while also reducing the lifetime of radioactive waste that is generated. ElulEJruhRQ There is also this video which ...
by Watsisname
19 Sep 2020 03:48
Forum: Science and Astronomy Discussions
Topic: Population Growth and Sustainable Development
Replies: 65
Views: 8133

Population Growth and Sustainable Development

Good info and good sources. Nuclear is indeed cleaner and by sensible metrics less costly to the environment and human life than coal and most other methods of producing energy. It's just that if it goes wrong, it can go very wrong and the impacts are harder for the public to miss (also easier to ov...
by Watsisname
19 Sep 2020 00:47
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34536 Like if you're flying fast towards a cliff, and a sound overtaking you from the behind will have its frequency shifted down, and when you hear the echo from the cliff a bit later, the same sound will be shifted up. Yes! Excellent analogy. 34534 hmmm this sounds a lot like how the sound of a t...
by Watsisname
18 Sep 2020 01:49
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34528 What I don't quite catch here is that the black hole could make me see the redshifted things behind me in two different directions, once directly (behind) and once bent around the black hole (in front).  Therefore I would expect bands. Aye, I think I see your confusion, and it's my fault for ...
by Watsisname
17 Sep 2020 11:35
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34524 If we were approaching a ring singularity in a spinning black hole would the tidal forces be as strong near the center? I believe that depends on the mass and the spin of the black hole. One could imagine a combination such that the ring singularity may be passed through with negligible tidal...
by Watsisname
17 Sep 2020 11:32
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 174
Views: 19615

Coronavirus (COVID-19) Thread

34525 Wat what do you think of all this vaccine being available before the new year talk? Depends what is meant by available. Some number of doses may be available for emergency deployment, I hope for the health care workers and the most vulnerable, but probably not for the general public, let alon...
by Watsisname
17 Sep 2020 03:14
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 174
Views: 19615

Coronavirus (COVID-19) Thread

As evidence builds that COVID-19 can damage the heart, doctors are racing to understand it.   Just another reason that everyone should really try to avoid getting this disease. A growing number of healthy people who recover from even mild cases of COVID-19 are later being found to have lasting prob...
by Watsisname
17 Sep 2020 01:47
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34514 But approaching the black hole behind and in front get somewhat smeared out, so would there rather be bands of red and blue? Objects behind you will be aberrated into view ahead, but there won't be bands of color. Just a smooth transition from redshift behind to blueshift ahead, as illustrate...
by Watsisname
16 Sep 2020 00:52
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34512 If you were already approaching the black hole close to the speed of light, so stuff in front of you should be blue shifted and stuff behind you should be red shifted, what then when diving into the black hole? In this case your journey to the center will be shorter (no surprise), and the bla...
by Watsisname
15 Sep 2020 20:12
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34510 Since you would reach crazy speeds relative to the background stars before the event horizon is crossed, why don't we see any redshift? Great question! Your speed relative to the stars would indeed be enormous when falling into a black hole. In fact, it is equal to the speed of light at the m...
by Watsisname
15 Sep 2020 07:07
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34507 Is there a way to simulate a voyage into the interior of a supermassive black hole using SE? Not currently. It would take a more complicated relativistic rendering system, which would also likely be very slow and computationally expensive. For now, SE calculates the view of a black hole accor...
by Watsisname
15 Sep 2020 06:48
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34501 But what about black hole cosmology, which states that the universe isn't a black hole but exists inside a black hole inside a larger universe? ¯\_(ツ)_/¯ It's a cool idea, but it doesn't yet provide us with a good way to find out if it is correct. The practical falsifiability is lacking, whic...
by Watsisname
15 Sep 2020 04:55
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 378
Views: 89157

Unusual weather

The smoke plume recently reached the jet stream, and is rapidly sweeping eastward. It now covers the entire northern US and southern Canada: https://i.imgur.com/bPrbnWN.gif I would not be surprised if people in northern Europe notice it in another few days. Conditions here meanwhile are slowly impro...
by Watsisname
15 Sep 2020 04:28
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

JackDole , okay, I define all my constants the same as yours and tested it out. Your formula looks right except there was a factor of 2 missing within the square root.  The correction is: gBH(r;M) = (G*M*mSol)/r^2*1/(sqrt(1-(2*G*M*mSol/(c^2*r)))) Using 1.5e12 solar masses for the black hole, I get ...
by Watsisname
14 Sep 2020 23:31
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 284884

Science and Astronomy Questions

34494 Then it seems right. Right on the horizon, about 0.14 parsecs, I have 10.67590883 g. Much the same as in your illustration. Mmm, that's not right.  For 1.5 trillion solar masses and exactly on the horizon, Newton predicts 10.17m/s 2  or about 1.03g, while in reality and according to general r...