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ASTRO 001 Unit 4

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ASTRO 001 Unit 4 How many stars do open star clusters contain? - ✔✔hundreds to thousands of stars What kinds of stars are visible in an open star cluster? - ✔✔blue stars How old are stars in an open star cluster? - ✔✔ ...

ASTRO 001 Unit 4 How many stars do open star clusters contain? - ✔✔hundreds to thousands of stars What kinds of stars are visible in an open star cluster? - ✔✔blue stars How old are stars in an open star cluster? - ✔✔relatively young Pleiades - ✔✔example of open star cluster How many stars to globular star clusters contain? - ✔✔hundreds of thousands to millions of stars What kinds of stars are visible in a globular star cluster? - ✔✔red giants (yellow in color) How old are stars in a globular star cluster? - ✔✔relatively old, many have ages around 10 billion years How can you determine the age of a star cluster? - ✔✔by seeing what spectral class of star has most recently "turned off" of the main sequence How are planetary nebulae formed? - ✔✔when stars run out of nuclear fuel and blow off outer layers What causes the gas to be ejected in layers in a planetary nebulae? - ✔✔the stars pulsate What often leads to symmetry in a planetary nebulae? - ✔✔bipolar jets How long to planetary nebulae last? - ✔✔tens of thousands of years How large can planetary nebulae be? - ✔✔can be a few light years in size What is left behind at the center of a planetary nebulae? - ✔✔white dwarf What will be part of the end state of the sun in 5 billion years? - ✔✔planetary nebulae What causes a nova? - ✔✔caused by a binary star surrounded by common envelope of gas What causes extra burning in a nova? - ✔✔mass transfer of hydrogen from companion star onto carbon white dwarf What causes a star to suddenly brighten, and can happen periodically? - ✔✔nova How do Type II supernovae occur? - ✔✔when massive stars die How do Type Ia supernovae occur? - ✔✔when very large amounts of material are added to a white dwarf What do type II supernovae contain? - ✔✔hydrogen Which supernovae does not contain hydrogen and why? - ✔✔Type Ia, and because they come from white dwarfs made of carbon Supernovae are _____ luminous than novae, but ___

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