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Astronomy CA REVIEW. Topics: Star Characteristics Star Life Cycles Galaxies Earlier topics are under Files: 3-1 REVIEW and 3-2 REVIEW. We are learning to : examine the life cycle of a star (characteristics; HR diagram)

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Astronomy CA REVIEW

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Astronomy CA REVIEW


Star Characteristics

Star Life Cycles


Earlier topics are under Files:

3-1 REVIEW and 3-2 REVIEW

We are learning to: examine the life cycle of a star (characteristics; HR diagram)

We are looking for: a description of how stars are classified by characteristics and then organized on an HR diagram.


Size- Giant, main sequence, and dwarf

Temperature- blue=hot; red=cooler

Brightness- apparent brightness and absolute magnitude

HR diagram shows temperature, brightness, color of stars and where the star is in its life cycle.

Used to graph the surface temperature (x-axis) vs. brightness (y-axis)

Hotter stars are on left side of graph; cooler stars on the right side of the graph

Brighter stars on top of graph; dimmer stars on bottom of graph

Which characteristic of stars cause them to be different colors?

  • chemical composition

  • distance

  • size

  • temperature

  • I need help.

Which color would describe the youngest and hottest star?

  • blue

  • red

  • orange

  • yellow

  • I need help!

Which star would be the brightest if all the stars are the same distance from Earth?

  • Main sequence

  • Neutron Star

  • Red super giants

  • White dwarf

  • I need help.

How would you classify our star, the sun, on the H-R diagram?

  • Main sequence

  • Red giant

  • White dwarf

  • Red supergiant

  • I need help.

We are learning to: Examine the life cycle of a star and predict the next likely stage .

We are looking for: progression of the stages of a star’s life

Nebulae- cloud of gas and dust

Protostar- fusion begins

Main sequence- average star

Giant/red-giant- more massive stars

Nova/supernova - exploding star

White dwarf- no nuclear process

Black dwarf- no heat or light

Black Hole (area of large gravitational attraction) or Neutron star (very dense star)

If given a protostar, what is the next likely stage of the star?

  • Super Giant

  • Nova

  • Main Sequence

  • Neutron Star

  • I need some help

What is the first stage of the birth of a star?

  • Main sequence

  • Nebula

  • Giant

  • Dwarf

  • I need some help.

What happens to the most massive stars as they near their death?

  • super nova to a black hole

  • super nova to a red giant

  • becomes a white dwarf

  • nothing happens

  • I need some help.

What is the next likely stage of our sun?

  • White dwarf

  • Black dwarf

  • Red giant

  • Super nova

  • I need help

  • We are learning to: explain that universe has billions of galaxies and are classified by shape

  • We are looking for: shapes of galaxies

  • Spiral- mix of old and new stars

  • Elliptical- more developed galaxies with older stars

  • Irregular-newer galaxies with newer stars

By what are galaxies classified?

  • Color

  • Temperature

  • Size

  • Shape

What type of galaxy is illustrated in the following picture?

  • Irregular

  • Spiral

  • Elliptical

  • I have no idea.. I need help!

What type of galaxies contain older stars?

  • Elliptical

  • Irregular

  • Barred shape

  • spiral

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