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Re: How are planets bright? [Re: nice1]
    #11711717 -

stars are so far away they are effectively point sources of light, so when the atmospheric effects redirect the light for a brief moment, there is an observable change in brightness.  planets are much closer so you can think of them as an aggregate of many points of light.  when one of these points' light rays is redirected, the other ones may not be, so there is a slight change in brightness, but much much less apparent than a star, so they don't appear to twinkle.
http://math.ucr.edu/home/baez/physics/General/twinkle.html

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Re: How are planets bright? [Re: CosmicFool]
    #11711737 -

The brightness of a planet is directly related to how much intelligent life lives on said planet. That's why you can't see Pluto without a telescope, it's too cold for life.



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Edited by CosmicFool (12/24/09 02:34 PM)

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Re: How are planets bright? [Re: CosmicFool]
    #11711794 -

:]

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Re: How are planets bright? [Re: CosmicFool]
    #11711810 -

Some say the really bright spot on the Moon is really a fusion reactor that uses H3 for fuel. It's more abundant up there I guess.

You'd need a really good telescope to see for sure though, and most NASA photos are supposedly edited.

As far as planets being bright, it's a reflection, perhaps some may make their own energy and give off light too.

Did you know Jupiter is technically a star?? :smile:


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Re: How are planets bright? [Re: mushroomhunter10]
    #11711854 -

mushroomhunter10 said:
As far as planets being bright, it's a reflection, perhaps some may make their own energy and give off light too.



A planet only needs a temperature to glow.  Every planet glows at a color dictated by its temperature, but they glow at a color we cannot see.  If they were hotter they would glow red and we could see them.  What we do see is not their glowing, but their reflection as already stated.

Quote:
Did you know Jupiter is technically a star?? :smile:


No...

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Re: How are planets bright? [Re: DieCommie]
    #11711919 -

Did you know planets sing?



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Let your imagination fill in the blanks.
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Edited by Thisfire (12/24/09 03:02 PM)

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Re: How are planets bright? [Re: HappyTrippin]
    #11711968 -

HappyTrippin said:
blewmeanie said:
Magic dust.


I think this is the correct answer.


I agree!


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Re: How are planets bright? [Re: mushroomhunter10]
    #11711977 -

jupiter is not a star. it does not contain enough gravitational pressure to fuse hydrogen together, which would make it a star.  models of jupiter indicate that increasing its mass four times would cause it to shrink, but not until at around 75 jupiter masses would ignition be achieved.

jupiter does radiate more energy than it receives from the sun, but this has nothing to do with it being a star.  surface cooling at its outer atmosphere causes pressure to drop and the planet to compress just a little bit.  this in turn causes core temperatures to rise.  this is simple gas law chemistry, and the same effect is observable on saturn, but does not make either planet a star.

on the subject of pretty cool planetary features..
saturn is a geometer

Edited by robothax (12/24/09 03:17 PM)

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Re: How are planets bright? [Re: robothax]
    #11712024 -

If you have time skatealex, look into gravitational lensing.  It has nothing to do with this topic, but it is very interesting.


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Re: How are planets bright? [Re: PreparationH]
    #11712148 -

same reason earth is. all the cities. :et:


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Re: How are planets bright? [Re: Envix]
    #11712238 -

PreparationH said:
If you have time skatealex, look into gravitational lensing.  It has nothing to do with this topic, but it is very interesting.


I'll check that out!

Envix said:
same reason earth is. all the cities. :et:



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Re: How are planets bright? [Re: robothax]
    #11712654 -

Thank you sir

5 for you! :mushroom2::mushroom2::mushroom2::mushroom2::mushroom2:


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Our thoughts create our reality.  :strokebeard:

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