Answer Happy

QUESTION 25 The correct spectral type classification of stars from hot to cold) O OBAFGKM. Oь. OBFОАКМ. MKGFABA d. MKAGFBO QUESTION 26 When a very high mass has evolved to an iron core, the gravitational collapse of the core causes the star to implode, then explode, resulting in a O a. Type I supernova O b. Type Il supernova O c. X-ray burster. d. Gamma-ray burster. QUESTION 27 The most famous G-type star is a. Polaris Ob. Betelgeuse c. Sirius d. The Sun.

QUESTION 28 The fusion of hellum to carbon in a star's con a. only takes place during the helium flash O b. requires higher temperatures than the four hydrater to hellum since nuclei with greater numbers of protons repel each other more strongly O c. doesn't require as high a temperature as does the carbon cycle, since greater mass nuclei repel each other less strongly O d. causes the star's core to become degenerate QUESTION 29 Which nebula is not associated with star formation? Da, Dark Cloud b. Reflection nebula OcHll region I d. Planetary Nebula