Continuous Emission From H+ Regions(Clouds ,Nebulae Star Births And Deaths)

Although most of the visible light from H+ regions is in the form emission lines, the same is not true at longer wavelengths, where most of the energy is radiated in a continuum. There are, in fact two continua: bremsstrahlung or free-free emission from the ionized plasma, which causes the… Read more“Continuous Emission From H+ Regions(Clouds ,Nebulae Star Births And Deaths)”

Collapse And Fragmentation of Interstellar Clouds (Clouds ,Nebulae Star Births And Deaths)

The evolution of a cloud of interstellar gas depends on a balance between internal gravitational forces tending to make it contract and thermal pressure tending to make it expand. James Jeans, in 1926, first showed that a cloud of given temperature and density can collapse only if its mass is… Read more“Collapse And Fragmentation of Interstellar Clouds (Clouds ,Nebulae Star Births And Deaths)”

Dark Clouds And Molecular Clouds (Clouds ,Nebulae Star Births And Deaths)

The thickest and densest interstellar clouds consist mainly molecular hydrogen. The reason for this is that the formation A preservation of molecules is facilitated by a high concentration f gas (and consequently a greater frequency of atomic collisions! and also a high concentration of dust grains which assist the formation… Read more“Dark Clouds And Molecular Clouds (Clouds ,Nebulae Star Births And Deaths)”