Assuming that the planet is a 'reasonable facsimile' of this planet;
Would the 'sun', if looked at directly, appear to be a color or would it just be too dazzling?
If the total light is less would there be more extensive ice caps &, perhaps, no tropical zone at the equator?
(I'm thinking of a planet w/ larger ice caps  & a temperate zone that extends from the equator to ??? latitude)
Also, I've seen on PBS & read in some other places, that people can't get a sunburn on the shore of the Dead Sea (in the middle east) because it's altitude is so low (way, way below sea level) that almost all the UV is filtered out by the atmosphere.
Would it possible to posit that this planet could have that property on all except high mountains/ranges?
(Could make climbing to high an interesting experience. "The sky-gods have punished you for intruding!")
How 'deep' would the atmosphere have to be?

Thanks for all the info,

--------------------------------------------
On Thu, 8/25/16, C. Berry <xxxxxx@gmail.com> wrote:

 Subject: Re: [TML] Earth 2?
 To: xxxxxx@simplelists.com
 Date: Thursday, August 25, 2016, 1:34 PM

 The light
 wouldn't be red like a traffic light, but rather kind of
 light-orange-brown like a low wattage incandescent light
 bulb. Blackbody radiation (which is more or less what stars
 produce) is smeared out over the spectrum, so all stars are
 mostly white, with some skewing reddish or bluish at low and
 high temperatures respectively. Fun trivia fact -- our own
 Sun is actually a green star, in the sense that its peak
 output is there. But it's such a broad peak that it
 looks white or yellow-white.
 Proxima would appear three times
 larger in angular diameter in the sky there than Sol does
 from Earth, but with much lower surface brightness -- around
 a factor of 12 dimmer, if my rough calculations are correct.
 The total light delivered would be less than what we get
 from Sol, but not by enough to be immediately obvious to the
 eye.
 Getting a sunburn
 would take a lot more exposure, but yes, there'd be
 plenty of energy in the UV.
 Proxima orbits (if it actually *is*
 orbiting, which hasn't been proven) A & B at a
 distance of 15,000 AU. Compare the Sol-Neptune distance of
 30 AU; Proxima is 500 times farther out. That's nearly a
 quarter of a lightyear. Hence the ambiguity about whether
 it's actually gravitationally bound to Alpha Centauri
 A/B.
 By the way, the
 mean A-B separation is comparable to the Sol-Uranus
 separation, though they follow more eccentric orbits around
 their center of mass than Uranus does around Sol.

 On Thu, Aug 25, 2016 at
 12:59 PM, Phil Pugliese (via tml list) <xxxxxx@simplelists.com>
 wrote:
 This
 email was sent from yahoo.com which
 does not allow forwarding of emails via email lists.
 Therefore the sender's email address (xxxxxx@yahoo.com)
 has been replaced with a dummy one. The original message
 follows:

 Let's talk a little about the new earth-like planet
 planet that's been discovered recently, right next
 door.

 From what I've seen & heard, it's orbiting
 Proxima Centauri & is so far from Alpha Centauri A&B
 that they would appear as a single star to an observer in
 orbit around the planet.

 I must say I was surprised to see such a planet discovered
 around a red dwarf but, assuming that it is in fact
 'earth-like', I wonder what it would be like on the
 surface.

 How would the reddish light affect vision?

 How bright would the 'dwarf appear to be to the naked
 eye from the surface?

 What, if any, would be the effect of the 'redness?'
 (a more infra-red compared to Sol) of the of the dwarf's
 radiation  be?

 Would it possible to get a 'sunburn'?

 Also, as I recall, Proxima actually orbits A&B.

 How far away is that orbit compared to our solar system?

 Is it farther away than Uranus?

 Any & all speculation would be welcome.

 TIA,

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