Ultimate space simulation software

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by Watsisname
18 May 2018 22:44
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 710
Views: 78224

Totally off-topic thread

Live view of fissure erupting.  The sound is amazing.

by Watsisname
18 May 2018 08:16
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

I have no idea.  But if an FTL ship passing Earth emits gravitational waves strong enough for our facilities to detect, it would be radiating so much power that it sounds like a very inefficient way to travel. ;)
by Watsisname
18 May 2018 00:15
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Normally an object moving in a straight line at constant speed does not emit any gravitational waves.  B ut this case may be different because of its faster-than-light nature.  Just as a charged particle moving faster than the speed of light in a medium emits Cherenkov radiation , mass moving faster...
by Watsisname
17 May 2018 15:50
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Haha, I can definitely understand wanting to have it looked at, after spending that much time working on it. :)   Our radius and temperature curves definitely explain the differences.  I wasn't expecting us to be using different data (or for the data to be that different).  In my case I used the sin...
by Watsisname
14 May 2018 23:35
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

An'shur ,  As a sanity check I ran up some code to compute it, and I do basically confirm your result. The magnitude change due to variability in radius and effective temperature isn't too big.  I found it to be about 1.2 magnitudes, using the V filter sensitivity curves and doing the integral ...
by Watsisname
12 May 2018 19:56
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Mr. Abner has the correct answer, with (almost) the correct explanation.  An object with constant acceleration in its frame of reference (what we call "proper acceleration") does not have constant acceleration as we see in the rest frame.  The observed acceleration decreases as its speed a...
by Watsisname
09 May 2018 02:50
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 710
Views: 78224

Totally off-topic thread

Some crazy footage of the ongoing eruption in Hawaii:



by Watsisname
08 May 2018 23:31
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

To summarize all of that a little more briefly in formulas: The Luminosity of a star is https://i.imgur.com/ctROAFu.gif where B(\lambda) is the Planck function: https://i.imgur.com/74hE7v0.gif The flux we observe is the luminosity divided by the surface area of a sphere whose radius is the d...
by Watsisname
08 May 2018 19:22
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Yeah, this calculation is quite a bit more complicated.   When we talk of a star's magnitude we do usually mean in the visible range, or as measured with a V filter, which roughly  corresponds to how our eyes see.  The figure you link is labelled m V  which is the magnitude in the V band.   So you'r...
by Watsisname
07 May 2018 02:06
Forum: Space Journeys
Topic: Recreation Image Dump
Replies: 49
Views: 5157

Recreation Image Dump

Wow, that's really amazing.
by Watsisname
07 May 2018 01:01
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Cool post, and a lot to cover with it so apologies in advance for the length! 20208 Is not Gravity the force that keeps the bowling balls from becoming larger? Gravity has also been keeping all other matter from being ripped apart, ever since the expansion rate started accelerating 7 billion years a...
by Watsisname
05 May 2018 02:33
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Interesting thought experiment. Assuming the string is made of discrete particles, I think that it will snap between every particle, leaving you with a wisp of atomic vapor.  My reasoning is that we are asserting it is non-stretchable, meaning there is zero width to the stable equilibrium position b...
by Watsisname
05 May 2018 01:48
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 211
Views: 36385

Show off your work

Image

???
by Watsisname
04 May 2018 17:53
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

20151 Can gravitational lensing be correlated with galactic rotation, both being caused by Dark Matter, rather than two separate observations of phenomenon? No, galaxies rotate too slowly, and rotation doesn't affect space-time in the correct way.  So rotation curves and gravitational lensing are i...
by Watsisname
04 May 2018 03:24
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 974
Views: 80851

Science and Astronomy Questions

Yes.   X-ray data, taken with the Chandra X-Ray Observatory, trace the distribution of gas, which is hot and ionized by the collision.  The gas distribution is shown in pink.   The lensing of the images of background galaxies (visible light, Hubble) maps the gravitational mass of the foreground clus...
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