Midterm 2 review question solution!!!

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Astronomy & Astrophysics
Stefan Mochnacki

Hello everyone. This is Black K s extraordinary work. If I made any mistakes please inform me, so I can correct it and tell someone else. Also, some questions I had no ideas how to answer, please tell me if you know how to do it as soon as possible. Ill be pretty appreciative. Thanks for cooperation. Those questions in green are the ones Im not sure. 1. Our Milky Way galaxy holds more than 100 billion stars; 100,000 light yr in diameter 2. Our sun is located in the disk about 28,000 light yr from the centre. 3. 100 (calculate by I=L4D) 4. B stars, because O stars are all dead. (Im not sure) 5. Visual; it can be seen by telescope. 6. Ionized He is strongest in O stars; neutral He is strongest in B stars; H is strongest in A stars, ionized metal is in G stars, neutral metal in M stars. 7. apparent brightness of that star; distance 8. 1) I=L4D 2) D=3.26p d is in light year, p is in arc seconds. 9. The cooler one 10. Upper right 11. Either O or B stars. 12. M K G F A B O 13. A molecular cloud > a spinning disk of dusk and gas orbiting a protostar > a protostar surr
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