Your SlideShare is downloading. ×
Earth science 25.2
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Earth science 25.2

481

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
481
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. 25.2 Stellar Evolution
  • 2. Protostar
    A collapsing cloud of gas and dust destined to become a star; a developing star not yet hot enough to engage in nuclear fusion.
  • 3. Supernova
    An exploding star that increases in brightness many thousands of times.
  • 4. White Dwarf
    A star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size, believed to be near its final stage of evolution.
  • 5. Neutron Star
    A star of extremely high density composed entirely of neutrons.
  • 6. Pulsar
    A variable radio source of small size that emits radio pulses in very regular periods.
  • 7. Black Hole
    A massive star that has collapsed to such a small volume that its gravity prevents the escape of everything, including light.
  • 8. Key Concept
    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.
  • 9. Key Concept
    We do know all stars, regardless of their size, eventually run out of fuel and collapse due to gravity.
  • 10. Key Concept
    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 dwarfs.

×