Largest Star in the Universe
Solar Voyager : General Discussion

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  karl.garnham1

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Cosmic Enigma
Cosmic Enigma

Joined: 2006-June-02
Location: United Kingdom
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Posted: 2012-November-06 at 12:55pm | IP Logged Quote karl.garnham1

Thanks for the info nkalanaga

That was really interesting so the atmosphere of yellow
hypergiant stars is unstable and as a result they are
probably not yellow for long. I think I understand now
what your saying about stars colours because I have
been told in trillions of years to come if you can see a red
that is too red for the human eye to see you would
notice its full of dead stars.

cheers

Karl


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My Goal is Simple Conquer Bryce or Die Trying. In Science and Space the only limits are your imagination nothing is impossible if you can imagine it.
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  nkalanaga

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Posted: 2012-November-07 at 1:00am | IP Logged Quote nkalanaga

True.  The "red too red to see" would be infrared, or heat, which was first discovered with a thermometer.  A scientist, using a prism to show the Solar spectrum, put his thermometer in the dark area beyond red, and found that there was a lot of energy there.  Just like an incandescent light bulb, red stars are most energetic in the infrared.

This has two effects on potentially habitable planets around such stars.  First, the habitable zone has to be calculated from the bolometric (literally, "heat"), or total, luminosity, or the planet will be placed too close and will overheat.  That means that the visible light will look considerably dimmer than for a Sun-like star, where most of the energy is in visible light.

It also means that, just like the light bulb, the red dwarf will look white to an observer, as long as there is no "true white" light to compare it to.  In fact, the average American 100 watt bulb is about the same temperature, and color, as an M6 star.  One source says any star over about M8 would look white to a nearby observer.  The bright red "red dwarfs" often seen in art wouldn't look that way at all from a nearby planet.

N Kalanaga 
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  karl.garnham1

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Cosmic Enigma
Cosmic Enigma

Joined: 2006-June-02
Location: United Kingdom
Posts: 1334
Posted: 2012-November-07 at 11:38am | IP Logged Quote karl.garnham1

Wow thats amazing. Thanks for the info there is one thing
I have wanted to ask you for a long time what is your
favourite star or favourite type of star (mines Eta Carinae
as it looks so unusual and reminds me of a brain.

Cheers

Karl


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