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(Space.com)   First Pluto, now the Goldilocks Zone. When I was a kid, it started at 0.95AU and we were happy   (space.com) divider line 56
    More: Interesting, habitable zones, planets, Arecibo, Goldilocks, planetary habitability, African Union, Gliese 581d  
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5279 clicks; posted to Geek » on 01 Feb 2013 at 11:30 AM (2 years ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2013-02-01 10:40:56 PM  

Iceman_Cometh: aerojockey: I came here to call shenanigans, but I see it's been covered.

Earth is closer than 0.99 AU, outside the supposed "habitable zone", in July at least.  So if the Earth were to orbit the sun at the distance it is during July for the whole year, all the water would evaporate?  Sure.

No it isn't. Earth is farther away from the sun in July than at any other time.


You're right.  My bad.  I forgot I didn't live in the Southern Hemisphere any more.

/yes I know
 
2013-02-01 11:49:55 PM  

Jubeebee: simplicimus: Apparently Earth is outside the habitable zone, at the zone begins at .99 AU.

That's kind of how I read this too. The earth's orbit is sufficiently elliptical that I would think we spend a good part of the year farther out than 0.99AU.

I am surprised Venus isn't in the habitable zone though. I thought Venus would be a nice place if not for all of the carbon mon/dioxide and sulfuric acid in the atmosphere.


Actually, we are just barely in the habitable zone, but on the warm side.  That means instead of the Sun boiling the oceans in a billion years, we only have 200 million years.
 
2013-02-01 11:53:18 PM  

Tommy Moo: Why is liquid water necessary for life? Isn't this a paradigm? Of course a solvent medium is best for bringing together the ingredients necessary for the right chemical reactions to occur, so some form of liquid on the surface is likely necessary, but why couldn't there be an entire ecosystem that arises based on ammonia? It is a polar solvent, like water. Reactions might take longer at colder temperatures, but this would only mean that life would take a billion years to evolve to the same extent as 100 million earth years.


Two reasons.  It makes a great, but not perfect solvent.  It also expands as it freezes -- if it did not then ice would form at the bottom of lakes and rivers instead of the top.
 
2013-02-02 12:57:06 AM  

aerojockey: Earth is closer than 0.99 AU, outside the supposed "habitable zone", in July at least.  So if the Earth were to orbit the sun at the distance it is during July for the whole year, all the water would evaporate?  Sure.


You have this backwards. Earth is furthest from the Sun in July. It's at the closest in January.
 
2013-02-02 02:03:28 AM  
If you really want Pluto, you can go ahead and name all the rest of the thousands of Pluto-sized objects in our solar system.
 
2013-02-02 07:39:49 AM  

The My Little Pony Killer: If you really want Pluto, you can go ahead and name all the rest of the thousands of Pluto-sized objects in our solar system.


Dozens as far as we know... not thousands.
 
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