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) We are looking for: a description of how stars are classified by characteristics and then organized on an HR diagram. Characteristics 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? a)chemical composition b)distance c)size d)temperature e)I need help.

Which color would describe the youngest and hottest star? a)blue b)red c)orange d)yellow e)I need help!

Which star would be the brightest if all the stars are the same distance from Earth? a)Main sequence b)Neutron Star c)Red super giants d)White dwarf e)I need help.

How would you classify our star, the sun, on the H-R diagram? a)Main sequence b)Red giant c)White dwarf d)Red supergiant e)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? a)Super Giant b)Nova c)Main Sequence d)Neutron Star e)I need some help

What is the first stage of the birth of a star? a)Main sequence b)Nebula c)Giant d)Dwarf e)I need some help.

What happens to the most massive stars as they near their death? a)super nova to a black hole b)super nova to a red giant c)becomes a white dwarf d)nothing happens e)I need some help.

What is the next likely stage of our sun? a)White dwarf b)Black dwarf c)Red giant d)Super nova e)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? a)Color b)Temperature c)Size d)Shape

What type of galaxy is illustrated in the following picture? a)Irregular b)Spiral c)Elliptical d)I have no idea.. I need help!

What type of galaxies contain older stars? a)Elliptical b)Irregular c)Barred shape d)spiral