Free planetarium

Search found 493 matches

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by Watsisname
28 May 2017 04:43
Forum: Feedback and Suggestions
Topic: General suggestions for SpaceEngine
Replies: 496
Views: 17297

General suggestions for SpaceEngine

A 2006 video game coded by a single person and available for free?  Impressive. :)

If you know of an easy way to render these disks with Keplerian rotation, feel free to suggest one.
by Watsisname
28 May 2017 03:04
Forum: Feedback and Suggestions
Topic: General suggestions for SpaceEngine
Replies: 496
Views: 17297

General suggestions for SpaceEngine

7977 Looked at both Sagittarius and the central black hole of IC 1101, which I think is the largest one in SE (and whose disk is around a light-year across). i think the speed of the latter is over 20 times c, just by eyeballing. Ok, I checked and calculated directly rather than eyeballing, and you...
by Watsisname
28 May 2017 01:22
Forum: Off-topic Discussions
Topic: General global warming / climate chage discussion
Replies: 88
Views: 2241

General global warming / climate chage discussion

There are a few important misconceptions and errors in your reasoning that I would encourage you to think about: 7961 Assuming 2C is the global, annual average, what we really need to know is the increase in the lower latitudes, and how the changes are distributed over the seasons and daily cycle. T...
by Watsisname
27 May 2017 18:03
Forum: Feedback and Suggestions
Topic: General suggestions for SpaceEngine
Replies: 496
Views: 17297

General suggestions for SpaceEngine

Mouthwash wrote:
Qr BbpostIt appears that the accretion disks around supermassive black holes rotate much faster than the speed of light. 

I've looked at a few and it doesn't appear that way to me.  Can you post an example?
by Watsisname
26 May 2017 20:05
Forum: Science and Astronomy Discussions
Topic: Asteroids, meteors, and meteorites
Replies: 13
Views: 554

Asteroids, meteors, and meteorites

Almost an Earth-grazer!
by Watsisname
26 May 2017 20:00
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 289
Views: 9120

Science and Astronomy Questions

The challenges would actually work out to be about the same in that case.   The idea is that you're trying to tease a particular spectrum (in this case a reflection spectrum of the planet) out of a signal that is almost completely due to something you're not interested in (the star).  So you have to...
by Watsisname
25 May 2017 18:59
Forum: Off-topic Discussions
Topic: Dreams you've had
Replies: 43
Views: 3504

Dreams you've had

7929 I doubt atoms as we know them can "mutate" in this way, but perhaps it is possible in the quantum world. Nay.  Quantum mechanically, particles are indistinguishable, and their properties are tied to constants of nature.  If they 'mutate' then this would be evident by changes in energ...
by Watsisname
25 May 2017 18:47
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 52
Views: 4103

Show off your work

\o/  Those are incredible.  Very nice processing. :)
by Watsisname
25 May 2017 15:30
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 289
Views: 9120

Science and Astronomy Questions

It resets to the default.  You can change the default value in main-user.cfg, under Controls Settings.  There is also a "quick zoom" (Home or middle mouse button) that you can customize as well. :) 7912 If I'm on a planet and want to scan around the horizon is there a way to keep the hori...
by Watsisname
25 May 2017 04:50
Forum: Off-topic Discussions
Topic: How do I even reply to this?
Replies: 14
Views: 307

How do I even reply to this?

Ah, I gotcha.   And yeah, I would say the mathematical form of the argument in the original post is not adequate for the application.  It doesn't reveal anything about conditions for stability. The correct way is to examine the changes in energy as the cloud shrinks, and the key principles come fro...
by Watsisname
25 May 2017 00:34
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 70
Views: 2490

Astrophotography

The classic Hydrogen Alpha. :)
by Watsisname
25 May 2017 00:28
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 289
Views: 9120

Science and Astronomy Questions

Yeah, there are direct images, but mostly of larger planets in larger orbits.  The technique also works better in the infrared, which reduces the brightness of the star relative to the planet.  I'm pretty sure there is not a single direct image of a terrestrial planet in visible light. 7896 BTW how ...
by Watsisname
25 May 2017 00:15
Forum: Off-topic Discussions
Topic: General global warming / climate chage discussion
Replies: 88
Views: 2241

General global warming / climate chage discussion

Acid rain is a fairly localized problem since the SO2 precipitates or otherwise looses concentration quickly.  The same is not true for ocean acidification, which when coupled with the rising temperatures is a significant concern to the health of the oceans.  We also know this from historical preced...
by Watsisname
24 May 2017 22:52
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 289
Views: 9120

Science and Astronomy Questions

Even if observing angle wasn't a problem, detecting this on an exoplanet would be pretty impractical.  In visible light, the planet provides less than a billionth of the light that the star does, and then the glint of sunlight off of ice crystals is an even smaller fraction of that.  It would be tot...
by Watsisname
24 May 2017 20:38
Forum: Off-topic Discussions
Topic: How do I even reply to this?
Replies: 14
Views: 307

How do I even reply to this?

I agree you can argue  that there is a midpoint between gravity winning and pressure winning, but I don't follow your argument that collapse can continue (that gravity keeps  winning).  What is the 4/8 ratio and how does it help?  Does it still hold if the collapse is adiabatic? Rigorously, the mid...
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