Alternate Planets, Suns, Stars, and Solar Systems Thread
- Thread starter Pragmatic Progressive
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Saturn’s magnetosphere is comparatively tame. Quite safe for humans to go through, all things considered. A deadly radiation belt isn’t a given for a gas giant.
Hey guys a question:
If an Earth-sized object orbited a gas giant in the habitable zone the size of.... Saturn, then how far out would it have to be to avoid the radiation belts and still have a 24 hour day/night cycle?
If an Earth-sized object orbited a gas giant in the habitable zone the size of.... Saturn, then how far out would it have to be to avoid the radiation belts and still have a 24 hour day/night cycle?
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It would certainly be inside its parent's magnetosphere, but this does not mean that it would not have its own. On the contrary, a moon with the proper conditions to have a magnetosphere (sufficiently rapid spinning and molten conductive interior) would very likely have its own magnetosphere.
Ah, that makes sense. I assume tidal locking wouldn't interfere with "sufficiently rapid spinning" if the orbit was fast enough
200,000 km or so. This give you an orbit of roughly 25 hr, 14 min, so you can make it a little less if you want. At this distance, the planet (assuming it's the same diameter as Saturn as well as similar mass) would be roughly 40 times the diameter of Earth's moon in the sky, at around 20°.
Thank you! Just one more question: Is 200,000 km close enough for tidal locking to take place?
Yes. In fact, all major gas giant moons will probably be tidally locked regardless of distance, unles they were captured like Triton.
Can a co-orbital of different solar systems orbit a black hole four million times the mass of our sun?
You're going to need to elaborate, that's for sure. If you're talking about lagrange points, the mass ratio between a primary and a secondary for lagrange points to be stable is 1:24.96- therefore Earth-Moon points are stable, but not Pluto-Charon.
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Oh! Mistook the word for something else, sorry. Does the mass of the black hole meaningfully play into the stability of this system where a different body’s mass wouldn’t? Or are you concerned more with the accretion disc interfering? If not, all you’d have to do is find a stable distance for a Trojan arrangement with the masses you want.
Interesting idea to have entire solar systems be the “bodies“ in question!
Suppose that you have a binary solar system, with a red dwarf orbiting a red giant from many AUs away. Once the giant goes nova, would the dwarf collect the debris from the explosion and become a different kind of main-sequence star, like G-type or F-type?
No, most of the debris from the supernova (not a nova, that's different) would go out into space or settle into a disk. However, it does enrich the other star which changes the spectrum of the star.
Three random questions:
One can be found in this link:
Why would a planet orbiting a super black hole from a distance of 6,231,000,000 miles have a year lasting just over a month?
Two, how far can a binary planet orbit another without tidal locking?
Three, can a binary planet still have seasons without a moon orbiting them?
One can be found in this link:
Why would a planet orbiting a super black hole from a distance of 6,231,000,000 miles have a year lasting just over a month?
Two, how far can a binary planet orbit another without tidal locking?
Three, can a binary planet still have seasons without a moon orbiting them?
Do you mean to ask how close can binary planets be before they tidally lock? That depends on the properties of the bodies themselves–mass, composition, etc.
Seasons are caused by axial tilt. Moons create tides.
Mercury has a 2º tilt. Where’s its moon? Jupiter has 80 moons and a 3º tilt. Mars has only insignificantly mass-compared asteroids for moons (similar to the Jupiter/moon comparison), yet it has an axial tilt almost identical to Earth’s. That the Moon collision probably caused proto-Earth to tilt (in the same way it’s estimated that Venus’s 170º tilt and therefore retrograde spin, as well as Uranus’s 97º tilt were caused by comparatively huge collisions) and the subsequent presence of a retained moon isn’t the determining factor for tilt itself. Hell, the Sun itself is tilted relative to the plane of the ecliptic. That happened (we think) when Gas Giant 5 was flung out of position during the formation of the solar system. Whether it’s still in orbit (the hypothesized size of Planet 9 based on motion of Kuiper belt objects also happens to be the correct size to cause such a tilt in the Sun) or shot into interstellar space aeons ago doesn’t matter. The tilt remains. Could be that Mars had a close encounter early on and got tilted from that.
From what I understand, that would create some pretty impressive auroras.