25.2 Stellar Evolution <br />
Vocabulary<br />
Protostar<br />A collapsing cloud of gas and dust destined to become a star.<br />
Supernova<br />An exploding star that increases in brightness many thousands of times.<br />
White dwarf<br />A star that has exhausted mot or all of its nuclear fuel and has collapsed to a very small size.<br />
Neutron Star<br />A star of extremely high density composed entirely of neutrons.<br />
Pulsar<br />A variable radio source of small size that emits radio pulses in very regular periods.<br />
Black hole<br />A massive star that has collapsed to such a small volume that its gravity prevents the escape of everythin...
Key Concepts<br />
When the core of a protostar has reached about 10 million K, pressure within is so great that nuclear fusion of hydrogen b...
We do know that all stars, regardless of their size, eventually run out of fuel and collapse due to gravity.<br />
As you can see, the sun begins as a nebula, spends much of its life as a main-sequence star, becomes a red giant, planetar...
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  1. 1. 25.2 Stellar Evolution <br />
  2. 2. Vocabulary<br />
  3. 3. Protostar<br />A collapsing cloud of gas and dust destined to become a star.<br />
  4. 4. Supernova<br />An exploding star that increases in brightness many thousands of times.<br />
  5. 5. White dwarf<br />A star that has exhausted mot or all of its nuclear fuel and has collapsed to a very small size.<br />
  6. 6. Neutron Star<br />A star of extremely high density composed entirely of neutrons.<br />
  7. 7. Pulsar<br />A variable radio source of small size that emits radio pulses in very regular periods.<br />
  8. 8. Black hole<br />A massive star that has collapsed to such a small volume that its gravity prevents the escape of everything, including light. <br />
  9. 9. Key Concepts<br />
  10. 10. When the core of a protostar has reached about 10 million K, pressure within is so great that nuclear fusion of hydrogen begins, and a star is born.<br />
  11. 11. We do know that all stars, regardless of their size, eventually run out of fuel and collapse due to gravity.<br />
  12. 12. As you can see, the sun begins as a nebula, spends much of its life as a main-sequence star, becomes a red giant, planetary nebula, white dwarf, and finally, black dwarf. <br />

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