Couple of questions regarding Physics Assignment (1 Viewer)

[A-Train]

*Outline how the accretion of galaxies and stars occured through
- expansion and cooling of the universe
- subsequent loss of particle kinetic energy
- graviational attraction between particles

*Lumpiness of the gas cloud that then allows graviational collapse

*define the relationship between the temperature of a body and the dominant wavelength of the radiation emitted from that body

i just dont get those points. So any help is appreciated

 

[Mat_Aussie]

the temperature is related to the composition of the sun/body.

each element burns at a specific temperature- so if the body is 7000 degrees the main element in its composition may be Hydrogen or helium etc, becoz that element burns at that temp.

each element has a specific wavelength, so when a wavelength is detected being emitted from the body, it is safe to say that the composition is of that element (with that specific wavelength) and if that element is in the composition then the temperature must be of that element