Recent content by nobunaga84

Yes,you're right."pai" is pi.I'm not really often type all this word,that's why I made mistake.I'm sorry for that. Thanks to astronuc , you help me a lot for solving the first question.

1)Flux from the sun that measured in the upper level of Earth atmosphere is 1370W/m^2.%This quantitiy is named the solar constant S and is equal to pai*f(sun).Calculate the pai*F(surface of the sun) with the angular radius of the sun that measured from earth. I really don't which equation...

Thanks for your help.

I would like to ask that what character does shock wave (not pressure wave ) play in the forming of a star from the interstellar cloud?

Thanks,Chronos.

hi,i'm a first year student that undergoing an astrophysics and cosmology course in university currently.i'm quite understand the luminosity and magniude of a star.can anybody help me to understand it?THANKS for your generasity.

Plz let me have it.