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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: A Dyson Sphere without a star a its center.

For SpaceNut re Apache Server error...

It appears that in the case of the paste in #25, the problem was an unbalanced double quote.

The snippet had a double quote character at the beginning of the line, but none at the end.

When I removed the orphan quote, the paste succeeded.

(th)

tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: A Dyson Sphere without a star a its center.

For Calliban ... following up ... here is a snippet from Caltech that considers Brown Dwarfs ...

People also ask
Can brown dwarves perform fusion?
Although brown dwarfs never truly become stars, some of them are able to act the part, for a short while. To start fusion, the very lowest-mass stars need about 80 times the mass of Jupiter. However, if a brown dwarf has at least 13 times the mass of Jupiter, it can ignite a limited form of fusion.
Stars & Brown Dwarfs - Cool Cosmos - Caltech
coolcosmos.ipac.caltech.edu › page › low_mass_stars_brown_dwarfs

This quote includes mention of Jupiter for comparison of masses. The capabilities of a Brown Dwarf to generate useful power might be of interest to someone, at some point.

(th)

Mars_B4_Moon

Member

Registered: 2006-03-23

Posts: 9,776

Re: A Dyson Sphere without a star a its center.

Perfectly Synchronized Planetary System Probed For Signs of Alien Technology

https://www.sciencealert.com/perfectly- … technology

Some 100 light-years from the Solar System dwells the most mathematically perfect planetary system we've ever seen.

The star at its center – a temperate orange dwarf called HD 110067 – is orbited by six exoplanets, each of which travels in harmony with its adjacent worlds. Such a perfect chain of orbital resonances is extremely rare, and it means that the system has remained relatively stable and undisturbed since it formed, around a billion years ago

Calliban

Member

From: Northern England, UK

Registered: 2019-08-18

Posts: 3,792

Re: A Dyson Sphere without a star a its center.

Tom's original idea was a Dyson sphere built around an artificial fusion reactor.  I think it could be done.  Both magnetic and inertial confinement fusion experience positive scaling effects, making it technically easier to reach the Lawson Criterion as size increases.  So the idea of a fusion reactor that functions as an artificial star, producing terawatts or petawatts of power, is technically achievable.  Tom's idea appears to have been based on inertial confinement.  First Light fusion are working on a concept very similar to what he suggested.

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"Plan and prepare for every possibility, and you will never act. It is nobler to have courage as we stumble into half the things we fear than to analyse every possible obstacle and begin nothing. Great things are achieved by embracing great dangers."

Void

Member

Registered: 2011-12-29

Posts: 7,815

Re: A Dyson Sphere without a star a its center.

Isaac Arthur has this video about Lagrange Points: https://isaacarthur.net/video/lagrange- … ettlement/

Perhaps large envelopes could be put into the Sun-Planet L4 and L5 of our solar system.  Materials scavenged from asteroids might give the needed materials.

Mars has some small trojans, Jupiter has a lot of them: https://isaacarthur.net/video/lagrange- … ettlement/
Image Quote:

I have the impression that you could make a huge envelop in the L4 or L5 locations and it may tend to stay there.  I think that Isaac Arthur has suggested that.

Then I suppose if you could do fusion, you would not be dependent on solar.

Done

Last edited by Void (2024-03-07 05:46:13)

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