PSU Astro 001 Unit 3 Exam.pdf file:///C:/Users/HP/Desktop/dddd/PSU%20Astro%20001%20Unit%
PSU Astro 001 Unit 3 Exam Questions & Answers
1. A large luminosity star
ANS Emits more light than a low luminosity star
2. If a red giant appears the same brightness as a red main sequence star,which one is
further away?
ANS The red giant
3. The heaviest nuclei of all are formed
ANS During a supernova explosion
4. Hydrogen-2 + proton = ?
ANS Hydrogen-2 + proton = Helium-3
5. Why does the main sequence part of a star's life end?
ANS The hydrogen in thecore is exhausted
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,PSU Astro 001 Unit 3 Exam.pdf file:///C:/Users/HP/Desktop/dddd/PSU%20Astro%20001%20Unit%
6. Many of the brightest 100 stars viewed from Earth are not on the main sequence (even
though most stars are) because...
ANS The most luminous stars aregiants and super giants that have already finished their main
sequence lifetimes
7. A 2 solar mass main sequence star is at the same distance as a 0.2 solar mass main
sequence star.Which star appears brighter?
ANS The 2 solar mass mainsequence star appears brighter
8. The temp. of the photosphere of the Sun is closest to...
ANS 6,000 kelvin
9. An estimate of the number of communicating/ technological civilizationsthat we
expect in our galaxy would have a larger number if...
ANS The average number of planets that could support life for each star was larger
10. If the Sun had twice it's mass, then which of the planets would be in it'shabitable
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