Exam 13: The Lives of Stars From Birth Through Middle Age

If an astronomer were to look at 1 kilogram of material taken from the surface of the Sun and 1 kilogram taken from the center, which of these statements would be true of the two kilograms?

What is the typical mass of a giant molecular cloud?

Dark nebulae are extreme examples of

What event occurs at the end of the pre-main-sequence stage of a star's life?

The period of variability of a Cepheid variable star, which is easily measured, is directly related to which stellar parameter, thereby providing a reliable method for the measurement of distance to stars?

How is the length of a star's lifetime related to the mass of the star?

The stars in an open cluster are useful for studying the early stages of stellar evolution because all the stars in a cluster have the same

The characteristic of a globular cluster of stars is

The major source of energy in the pre-main-sequence life of the Sun was

Most interstellar matter is too cold to be observed optically. Its radiation is predominantly emitted at longer wavelengths, such as infrared and radio. This behavior is an example of

In terms of nuclear reactions, what is the next stage of a star's life after the end of hydrogen burning in the core?

Place these objects in order, from smallest to largest.

What is the MOST important process that causes a protostar to stop accreting mass?

What makes a red giant star so large?

What is the luminosity class of most of the stars visible to the naked eye? Are these actually the MOST numerous stars?

What do a reflection nebula surrounding a star and Earth's atmosphere have in common?

New stars are formed from

Which wavelength region is MOST useful for investigating the dense cores inside giant molecular clouds?

Which of these stars are metal-poor?

About 3000 stars are visible to the unaided eye on a clear night, and the majority of these are giants and supergiants. However, theories predict the most numerous stars should be red dwarfs. Is there an explanation for this discrepancy? If so, what is it?