Stellar Astronomy Unit Summative

What are the two most abundant elements in a main sequence star?

• a) carbon and hydrogen

• b) hydrogen and helium

• c) helium and carbon

• d) carbon and heavy metals

The life cycle path followed by a star is determined by the star’s initial:

• a) mass & size

• b) temperature & origin

• c) luminosity & color

• d) luminosity & structure

What factor below usually determines whether a star will be on the main sequence of the H-R Diagram?

• a) age (where star is in its stellar evolution or life)

• b) elements in composition (what the star is made of)

• c) frequency of starquakes

• d) distance from our Sun

Which factor determines a star’s absolute magnitude (luminosity)?

• a) The star’s temperature

• b) The star’s distance

• c) The star’s shape

• d) b & c

Stars like our Sun most likely formed directly from a:

• a) stellar nebula

• b) supernova

• c) red giant

• d) planetary nebula

Eventually our Sun will...

• a) explode in a supernova

• b) become a black hole

• c) change into a white dwarf

• d) become a neutron star

The force that holds the galaxies together is

• acceleration

• Newton's first law

• gravity

• mystery

The shape of our Milky Way galaxy is

• elliptical

• spiral

• irregular

Which is bigger: our galaxy or our solar system?

• our galaxy

• our solar system

Gamma rays, X-rays, visible light, and radio waves are all types of

• Nuclear energy

• Ultraviolet radiation

• Low energy waves

• Electromagnetic energy/radiation