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Forum > Site related questions, answers and discussions > HOT OR COLD???? (16 posts)
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| rodenbough |
HOT OR COLD???? |
Jun 25, 2008
06:56
Member since June 06, 2008
posted 34 messages in the forum
Solar Systems: Qaanis (VDJ503), Antisolios (MGH644), Solios (QFG246), Malika (UAJ788), Qimpuzig (PKK283) and 21 more...
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In determining whether aplanet is sutable for colonization I have trouble determining whether the planet is a thousand degrees ABOVE zero or BELOW zero. Could the site be more helpful in providing info on planetary temps by pacing a minus sign on the readings to indicate if it is beneath zero on the Kelvin scale? What is your feed back???
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| physicsguy |
Kelvin |
Jun 25, 2008
14:46
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The Kelvin temperature scale is an absolute scale, so there's no such thing as negative Kelvin temperatures (except in really odd cases we don't deal with). Similarly, the Fahrenheit and Celsius scales don't go to -1000 degrees, Celsius stops around -273 and Fahrenheit stops around -460.
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| rodenbough |
Thanks |
Jun 27, 2008
20:52
Member since June 06, 2008
posted 34 messages in the forum
Solar Systems: Qaanis (VDJ503), Antisolios (MGH644), Solios (QFG246), Malika (UAJ788), Qimpuzig (PKK283) and 21 more...
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Thanks Physics Guy.
Now for the next question: Why are the distant planets so darned hot??? Given the physics of the Solar system, are they not supposed to get cooler as they move away from the solar body? Why are the M stars so hot? They are the coolest of the main sequence stars and red giants are even cooler than the dwarves.I can understand the blues and whites, but the reds????
Please post the scale of the stellar temps according to their spectral types.
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| physicsguy |
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Jun 27, 2008
21:03
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The planet temperature problem has been noted many, many times on the forums previously. My best guess is the temperature algorithm derives both from the distance from the primary and the mass of the planet. That's why smaller planets do tend to get colder the farther from the star they are, but then large planets (ie, gas giants) will pop up with very, very high temperatures.
As for stellar temperatures, Jos is using a simplified stellar classification system. The one used by astronomers and astrophysicists can be found at:
http://en.wikipedia.org/wiki/H-R_diagram
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| thegreatpl |
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Jun 27, 2008
23:26
Member since June 01, 2008
posted 2421 messages in the forum
Solar Systems: none
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i remember reading somewhere that gas giants are hot because of their mass. since most of the outer planets are gas giants i assumed it was this.
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| physicsguy |
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Jun 27, 2008
23:34
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Our gas giants get some heat from gravitational differentiation, but not enough to account for the temps in galaxiki. Jupiter gets the most benefit from this, but Uranus and Neptune are actually damn, damn cold.
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| wert |
Othe Gas gaints |
Jun 28, 2008
15:50
Member since November 12, 2007
posted 449 messages in the forum
Solar Systems: Neo Zion (UGH116)
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I heard about a gas gaint in anothe solar system that tool 5 days to orbit so was practically skimming the star. How would somthing like this form?
(Also it would be pretty damn hot by my rekoning)
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| physicsguy |
Extrasolar Gas Giants |
Jun 30, 2008
17:46
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The current technique for finding extrasolar planets is, as of yet, not very sensitive to the sort of objects we find in our own solar system. As with any new method, it is the extreme objects which will be observed first, which is why astronomers are finding all manner of "hot Jupiters" as opposed to "cool Jupiters" or terrestrial objects. These "hot Jupiters" are very massive and very, very close to their primaries, so they have a larger effect on the position of the primary, which is what these methods actually measure.
As to how they would form, they would form just like planets in any stellar system would form. The difference is the primaries and, by extension, the stellar systems are very young. "Hot Jupiters" are by no means stable systems and, within a matter of tens of millions of years, are likely to either move to stable orbits at greater distances, or be evaporated by photon pressure.
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| iestyn |
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Jul 11, 2008
11:46
Member since May 30, 2008
posted 89 messages in the forum
Solar Systems: theiestonianspiral (RFH723), Edoniancluster (SAK994)
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hi there have you got the talky thing(msn) 
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| physicsguy |
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Jul 11, 2008
15:26
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no
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Forum > Site related questions, answers and discussions > HOT OR COLD???? (16 posts)
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