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[mainiac]

Space is chock full of stars.

[origamiscienceguy]

And in fairness, there are a couple planetoids out there bigger than Pluto. Mostly not by very much, and on pretty weird orbits too.

If it turns out to be there, I do approve Chronos/Kronos.

Actually, New Horizons proved Pluto is in fact bigger than Eris, making Pluto once again the biggest dwarf fortress.

[Teneb]

And in fairness, there are a couple planetoids out there bigger than Pluto. Mostly not by very much, and on pretty weird orbits too.

If it turns out to be there, I do approve Chronos/Kronos.

Actually, New Horizons proved Pluto is in fact bigger than Eris, making Pluto once again the biggest dwarf fortress.

Eris changes her size periodically to cause controversy. It's her thing.

[MonkeyHead]

And in fairness, there are a couple planetoids out there bigger than Pluto. Mostly not by very much, and on pretty weird orbits too.

If it turns out to be there, I do approve Chronos/Kronos.

Actually, New Horizons proved Pluto is in fact bigger than Eris, making Pluto once again the biggest dwarf fortress.

To be fair, in Astronomy, if observed values end up the same order of magnitude as predicted values it is usually remarkable.

[Graknorke]

And in fairness, there are a couple planetoids out there bigger than Pluto. Mostly not by very much, and on pretty weird orbits too.

If it turns out to be there, I do approve Chronos/Kronos.

Actually, New Horizons proved Pluto is in fact bigger than Eris, making Pluto once again the biggest dwarf fortress.

To be fair, in Astronomy, if observed values end up the same order of magnitude as predicted values it is usually remarkable.

Remember, the temperature of the surface of stars is approximately 0K. For the purposes of some calculations anyway.

[Cryxis, Prince of Doom]

Has black hole sun been discussed yet?

[Il Palazzo]

Has black hole sun been discussed yet?

I think it has. The conclusion was that the Sun isn't one, and Soundgarden had just one good song.

[Cryxis, Prince of Doom]

So a black hole wouldn't work as a pseudo sun

[Putnam]

Oh, that? Yeah, a black hole of equivalent mass to the sun would result in a solar system that is completely identical to this one in terms of orbits AFAIK.

[MetalSlimeHunt]

Actually, I don't think so. The sun is constantly emitting a negligible-for-its-size but real amount of both matter and energy, while a black hole of equal mass would not. As such....I'm not exactly sure what that would do to the orbits, but I'm sure it would add up over the millennia.

[origamiscienceguy]

Actually, I don't think so. The sun is constantly emitting a negligible-for-its-size but real amount of both matter and energy, while a black hole of equal mass would not. As such....I'm not exactly sure what that would do to the orbits, but I'm sure it would add up over the millennia.

Centripetal force keeping the planets in orbit would be exactly the same. I think that's what he was trying to say.

[wierd]

This ignores the magnetic interactions though!!

The solar magnetosphere encompases the whole solar system. Exiting that magnetosphere is when you hit the heliopause, and enter interstellar space.

A black hole does not really have a magnetosphere; the necessary photon-photon interactions needed to have the requisite field lines are impossible, because photons cannot escape from the blackhole's event horizon. This means that unless the hole is actively feeding (and therefor has a plasma torus surrounding it) there cannot be such a strong magnetosphere. (in either case, the hole itself cannot sustain a magnetic field. The torus just on the event horizon makes the field, driven by obscene dynamo effects.)

You should not discount the impact this would have on planetary systems. Large, highly magnetic bodies like Jupiter would become the main forces of magnetisim in the planetary system (again, unless the hole is actively feeding), and this would perturb the orbits of smaller but still magnetic bodies, like the earth. 

If the hole was actively feeding, the field produced by the plasma torus would be many times stronger than that of our sun, because the excitation energy is much higher. (matter is literally being pushed up and passed the degenerate threshold at the inner side of the torus!!) This strong a field would tug on massively magnetic bodies like Jupiter, pulling them into the inner solar system.

Black hole sun would not work the same as a normal star in either case.

[Il Palazzo]

You should not discount the impact this would have on planetary systems. Large, highly magnetic bodies like Jupiter would become the main forces of magnetisim in the planetary system (again, unless the hole is actively feeding), and this would perturb the orbits of smaller but still magnetic bodies, like the earth.

By how much? Because unless you show me some numbers, I'll happily discount it, and much more easily than radiation and solar wind pressure, or solar mass loss.

[wierd]

magnetic flux tube formation is enough to rip atmospheres off.

Chew on that a bit.

[Il Palazzo]

Ah. So you've never actually tried putting any numbers on that.