Abeeda17
Badges: 2
Rep:
?
#1
Report Thread starter 7 years ago
#1
Life cycle of a star? I find the concept hard to grasp
0
reply
Pessimisterious
Badges: 12
Rep:
?
#2
Report 7 years ago
#2
Dust cloud.
Collapses (slowly at first).
If enough dust, the particles form solid object.
If even more dust, the gravity of the object causes high pressure at the centre. Centre becomes molten (this is why all large planetary bodies are spherical - the core melts so the upper surface settles to a uniform shape).
If the object is REALLY big, the pressure causes fusion of hydrogen into helium.
Fusion releases energy.
Energy = heat and light
Star forms.
Energy irradiated over life of star.
Towards end of life, star expands. This is because the core has lost a lot of mass by this time, so the outer layers undergo less gravitational effects.
Core starts to burn out - not enough energy released to keep outer layers stable, centre of star collapses, layers fall inwards, impact causes mass ejection of elements.
This happens a few times.
Eventually only the core us left.
Core now very dense.
Neutron star formed. End.

OR.

If star not large enough, it just burns out, no explosions, nothing special. Becomes a brown dwarf. Eventually dies. Presumably becomes a large dead rock of heavy metal in space.


Posted from TSR Mobile
0
reply
Abeeda17
Badges: 2
Rep:
?
#3
Report Thread starter 7 years ago
#3
Thank you, but what about the red giant?


Posted from TSR Mobile
0
reply
Pessimisterious
Badges: 12
Rep:
?
#4
Report 7 years ago
#4
(Original post by Abeeda17)
Thank you, but what about the red giant?

Posted from TSR Mobile
Hmmm my bad, looks like I've gone a bit wrong.

Red Giant is the part where the star expands.

It goes something like this:

  • Dust cloud
  • Collapse
  • Large object (if large enough, fusion begins)
  • Star


And then, depending on the size of the star:

  • Expands to ted giant
  • Partially collapses (outer layers ejected, known as a planetary nebula)
  • Burns out into white dwarf and simply fades away, OR



  • Expands to red giant
  • Collapses (nova = mini explosions releasing outer layers, then supernova = whole thing properly goes boom)
  • Tiny dense neutron core remains ( = neutron star, or black hole if the remaining core has enough mass)




Image
0
reply
Abeeda17
Badges: 2
Rep:
?
#5
Report Thread starter 7 years ago
#5
Awwe it's okay, thank you


Posted from TSR Mobile
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should the school day be extended to help students catch up?

Yes (74)
30.08%
No (172)
69.92%

Watched Threads

View All