1. The factor that determines the length of a star’s main sequence lifetime is t
ID: 1464737 • Letter: 1
Question
1. The factor that determines the length of a star’s main sequence lifetime is the star’s
A. content of carbon B. distance from the Sun C. spectral type D. mass
2. A supernova
A. has been observed within 100 light years of the Earth B. can outshine the entire galaxy in which it occurs C. can be classified into one of three types D. All of the above
3. A planetary nebula is
A. dust and gas orbiting a planet far from its surface B. dust and gas orbiting close to a planet’s surface C. gas blown off a dying star D. material from which planets are forming
4. Which of the following ranks the stars from the smallest in size to the largest?
A. White dwarf, main sequence star, red giant B. Red giant, white dwarf, main sequence star C. Main sequence star, red giant, white dwarf D. The question is misleading, these objects are all the same size.
5. We can learn the age of a star cluster by
A. studying the Doppler shift of radio waves from it B. studying the reflection of light from stars in the cluster C. plotting the stars of the cluster on an H-R diagram D. observing supernovae within the cluster
Explanation / Answer
1) D - Mass
2) B - can outshine entire galaxy in which it occurs.
3) C - Gass blown off a dying Star.
4) A - white drawf, main sequence, red giant.
5) C - plotting the stars of the cluster on H-R diagram.
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