2. 1.
2.

3. protostar

4. 

Supernova

5. protostar (M)
M
M ≥ 25 M
9M ≤ M ≤ 25M
0.08M ≤ M ≤

10. 9

12. 5,000
10,000
100
1 100

13. 

14. brightness
1
magnitude

15. 1
2.512
5
2.512 5 100
-26.7
-4.5
-0.5
0.45

16. 10 32.62

17. 7

18. O
30,000
O 9.5
B 30,000-
10,000
B3
A 10,000-
7,500
A2
F 7,500-
6,000
F5

19. Parallax)
2

20. 
 Parsec” Parallax Angle
of 1 Arc Second
AU


22. 
r = 1/p
r = distance)
pc)
p = parallax angle)

23. Regulus)
r = 1/p
= 1/(0.04)
x 3.26 = 81.5

25. 
M42

27. 

IC 434

29. 
 Charles Messier

31. 
Monoceros)
 NGC 2237

33. 

36. 1.
2. 2
3. 3
80
50