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The sun is a_.

main-sequence star

What is the next stage in the sun's life cycle?

red giant

What will be the final stage in the sun's life cycle?

black dwarf

Light cannot escape the intense gravitational pull of a_.

black hole

Our galaxy is called the_.

Milky Way

At its nucleus, the Milky Way Galaxy is about 100,000 light-years wide and_.

10,000 light-years thick

Where is our sun located in the Milky Way?

within one of the spiral arms

About 60 percent of all known galaxies are classified as_.

elliptical galaxies

According to Hubble's law, galaxies are retreating at a speed that is proportional to their_.

distance

Which of the following indicates that the universe is expanding?

red shift of distant galaxies

Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that_.

the universe is expanding

Greater red shifts in the spectra of galaxies indicate_.

faster speeds

According to the big bang theory, the universe began about_.

13.7 billion years ago

Patterns of stars are called what?

constellations

The most basic way to measure the distance to a star_.

parallax

Which factors determine a star's apparent magnitude?

size, tempature, distance

What are the two main types of bright nebulae?

emission nebula, and reflection nebula

What happens to a low mass star when it depletes its hydrogen fuel?

it collapses into a white dwarf

What is a galaxy?

a group os stars,dust, and gases held together by gravity

Describe each step of the sun's life cycle.

red giant, planetary nebula, white dwarf, black dwarf

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