Started by Spike, November 11, 2009, 03:46:22 PM
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Quote from: Isaac.Eiland-Hall on November 11, 2009, 10:10:59 PMI like that if you give a seed of "1", the sun is named "Zero".This seems really neat!
Quote from: Hajo on November 11, 2009, 03:46:22 PMIf someone has good ideas how to determine which planets should be bare rocks, or with an atmosphere, and then how dense that atmosphere should be, please let me know. Also, and linked to this problem, is, how to calculate surface temperatures for such planets. Currently the temperature calculation is really a very coarse guesswork.
Quote from: Timothy on November 12, 2009, 10:07:21 AMUsually there's a band at a certain distance from the sun in a system where solar radiation isn't too high or too low to sustain life. This would depend on the intensity of the star. It will also depend on the composition of the planet in question, the strength of its magnetic field (to deflect radiation) and other things, like its rotational period and size and so-forth.
Quote from: Timothy on November 12, 2009, 10:07:21 AMI think it'd be best to generate the size, distance from sun, rotational period, magnetic field, moons, rings etc. initially, then use those factors to determine how likely life is to exist on the planet. Some measure of chemical content for the planet and atmosphere (simplified of course) could also factor into this.
Quote from: Timothy on November 12, 2009, 10:07:21 AMIt'd also be cool to generalise this enough so that "strange" combinations could exist, e.g. life-bearing planets orbiting gas giants outside the normal habitable region of a solar system owing to additional energy from that large body. Or even systems with life-bearing moons orbiting a brown dwarf star in orbit around another star.Dual-sun systems and so-forth would also be cool, and don't forget to add other forms of celestial phenomena to explore (e.g. pulsars, nebulae, black holes etc...)
Quote from: Timothy on November 12, 2009, 10:07:21 AMI don't actually have Java installed here, so I can't play with it :(
Quote from: prissi on November 13, 2009, 10:13:04 AMWell done!
Quote from: Hajo on November 15, 2009, 12:16:24 PMDoes someone know where to find tables of the frequency of sun types - I mean something like "15 in 1000 suns are red giants" or such.
Quote from: Hajo on November 15, 2009, 12:16:24 PMAlso, is it "white dwarf sun" or rather "white dwarf star"? I feel uncertain about the use of sun and star in this context.
Quote from: Hajo on November 15, 2009, 05:25:32 PMDoes someone know how to calculate surface gravity for a planet from mass and radius?
Quote from: skreyola on November 15, 2009, 10:33:42 PMStar is the correct generic in English. I believe sun usually refers directly to Sol, though I have seen it used in a generic sense, but it sounds awkward.
Quote from: Hajo on November 16, 2009, 10:42:02 AMMy last math lesson happened 10 years ago or so ... I definitely won't try to develop such formula on my own But it's good that this project refreshes some of the math and physics basics. Thanks for help and advice
Quote from: Hajo on November 16, 2009, 10:42:02 AMEdit 2: Radiation power of a star is proportional to "star surface times surface temperature"? Surface temperature of a planet is roughly proportional to "sun radiation_power times distance from sun, squared"? Is that correct?Atmospheric modifiers and albedo can be calculated after this coarse temperature guess, I think.
Quote from: vilvoh on November 16, 2009, 11:46:31 PMAbout the star size issue, I've found this amazing video that shows a comparison of sizes between planets and knows stars of the universe.