Stars and Galaxies

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

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By 5 billion years… White Dwarf

Small, but very hot

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Massive Stars are different

On the “Main Sequence” but

not for long

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Betelgeuse—Red Supergiant

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Supernova—Massive Star Explodes

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Neutron Star or Pulsar

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Black Hole

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Classifying Galaxies

Slide 53

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

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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

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Galaxies

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Spiral galaxy--Andromeda

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Spiral Galaxy on Edge

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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

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Elliptical Galaxies

Slide 61

Lenticular