Wednesday, February 10, 2010

A couple true or false questions?

Please explain this because I don't understand


The vast majority of stars near us would fall to the bottom right on the H-R diagram.





Reflection nebulae appear blue because they scatter light from hot blue stars.A couple true or false questions?
The vast majority of all stars are at the bottom right of the H-R diagram being that of a small K or M type star so it would be reasonable to say true.


This is true for anything that doesn't emit its own light but it depends if the nebula has reached critical mass at any point or not but in general yes its true.A couple true or false questions?
Vulcid is correct for the first part- as most stars around us are small, dim main sequence stars, they are in the lower right of the HR diagram. TRUE





Reflection nebulae are usually blue because the scattering is more efficient for blue light than red (this is the same scattering process that gives us blue skies and red sunsets).





Thus FALSE.

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