Exam 9: The Formation and Structure of Stars

The above image is an example of interstellar reddening.

-The above visual wavelength image of the Trapezium cluster shows _________.

Pre-main-sequence stars are above and to the right of the main sequence.

While on the main sequence a star's primary energy source comes from

-The above image is an example of a/an _________ nebula.

Which of the following in not a factor that prevents molecular cloud contraction

________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles.

Why are reflection nebulae blue in color

The densest, coldest clouds are called _____________.

________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence.

The dust in the interstellar medium can make distant stars look redder than they really are.

____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom.

Why is there a lower end to the main sequence 

Which of the following is a method of energy transport

The central cores of which type of star is the lowest temperature

Protostars are difficult to observe because