Celestia Forums

Any photometrists around here ?

Here is a question :

is there any effect (other than reddening) that the color indices U-B, B-V and V-I (Johnson-Cousins system) are sensitive to ? (i.e. metallicity, age, etc)

And another :

what is the inferior mass for a supergiant star ?

The Mars Express orbiter has detected water ice in the south polar cap of Mars. It seems that this is the first direct detection of water on Mars, though there were many hints from previous data (like the presence of hydrogen, the canyons, etc).

Any comments or thoughts ?

My goofy idea I wouldn't qualify this idea as "goofy". From any logical or idealistic point of view, military expenditures are a huge and meanigless waste of ressources if you consider humanity as a whole. And the inertia of the people on this particular subject (well, and on many others) is despai...

Good plan, but it's our way of thinking that needs to change : if we change that, we won't have to use the death penalties that you propose. ...under punishment of death for the ENTIRE government A clean and peaceful world where we would have to resort to these measures would be perhaps even more pa...

or a ballons surface that is expanding while beeing inflated If there's anything at all in which the Universe could expand : no one has ever found any hint that there may be anything else than our 3+1 dimensions* universe. We use the "ballon analogy" only because we cannot imagine an expansion with...

My idea is that the explosion or expansion of the Big Bang theory produced so much energy that it sent ripples into space-time I don't get it : to create ripples, you need an explosion, i.e. a starting point, right ? The Big Bang wasn't localized, much more a sort of super hot and dense state of th...

After all this time of doubting Bush...I do believe he has done something right. Just surfing on the MER wave... He made a nice speech, alright. But every politician does this when faced with internal and international problems. So, for some time, people will look elsewhere... Although I'm a die-ha...

(2) is probably because your video card doesn't support bump maps Crap. I have an ATI Radeon 9000. Must be the drivers again. I should have stuck with Nvidia... Anyway, thanks, that helped. this is an absolutely tremendous release, with a gigantic number of new features and some bug fixes I agree. ...