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Stars and Galaxies
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Animation at http://www.nasa.gov/97994main_BHabitableZone.MPG

Slide 44

By 5 billion years… White Dwarf

By 5 billion years… White Dwarf

Small, but very hot

Slide 45

Stars and Galaxies

Slide 46

Stars and Galaxies

Slide 47

Massive Stars are different

Massive Stars are different

On the “Main Sequence” but

not for long

Slide 48

Betelgeuse—Red Supergiant

Betelgeuse—Red Supergiant

Slide 49

Supernova—Massive Star Explodes

Supernova—Massive Star Explodes

Slide 50

Neutron Star or Pulsar

Neutron Star or Pulsar

Slide 51

Black Hole

Black Hole

Slide 52

Classifying Galaxies

Classifying Galaxies

Slide 53

Galaxies

Galaxies

come in different sizes (dwarf, large, giant)

come in different shapes and classifications

Spirals

Ellipticals

Lenticulars

Irregulars

are fairly close together, relative to their sizes

Slide 54

Spiral Galaxies

Spiral Galaxies

have flat disk, spiral arms, central bulge, and a surrounding halo

some have a “barred” bulge

are fairly large (no dwarf spirals)

have lots of gas and dust and younger stars in their arms, but older stars and little gas or dust in their halos and central bulges

Slide 55

Galaxies

Galaxies

Slide 56

Spiral galaxy--Andromeda

Spiral galaxy--Andromeda

Slide 57

Spiral Galaxy on Edge

Spiral Galaxy on Edge

Slide 58

Spiral Galaxies

Slide 59

Elliptical galaxies

Elliptical galaxies

range from spherical to football shaped

range from very small to giant

have very little gas or dust

mostly old stars

similar to the central bulge of a spiral galaxy

Slide 60

Elliptical Galaxies

Elliptical Galaxies

Slide 61

Lenticular

Lenticular

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