|
Size: 1306
Comment:
|
Size: 722
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 8: | Line 8: |
| . about 20 M⊙ | . about 20 M⊙ , 51 kpc away. |
| Line 14: | Line 14: |
| || 3 million years ago || end of Pliocene || began burning helium (in core) || || 20 thousand years ago || Lascaux || began burning carbon (in core) || || 1980 || || began burning neon and oxygen (in core) || || 1987 Feb 20 || || began burning silicon, producing an iron core || || 1987 Feb 23 7:35 UT || || explosion || |
|| 3 million years ago |
End In Fire
The supernova in the Large Magellanic Cloud
Paul Murdin, Cambridge University Press, 1990
About SN1987A, a.k.a. Sk-69 202 in the Large Magellanic Cloud, which University of Toronto astronomer Ian Shelton first observed 1987 February 27 with the 24 inch telescope at the Las Campanas Observatory in Chile.
- about 20 M⊙ , 51 kpc away.
page 71: Timeline for SN1987A (need observed aftermath)
Observed time |
epoch |
status of star |
20 million years ago |
Miocene |
star formed, burned hydrogen for some 15 million years |
|| 3 million years ago