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Q4 stars can have all kind of different masses and

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Q4:Stars can have all kind of differentmassesand theirfrequency(i.e. howabundant they are in the Universe) depends strongly on their mass (=stellarmass function). Which one of the following is correct for the Sun?A.The vast majority of all stars have a lower mass than the SunB.The sun is an average star. Stars with 1 solar mass are the most abundantstarsC.The Sun is one of the most massive stars in the GalaxyD.The Sun is one of the least massive stars in the GalaxyE.The vast majority of stars have a higher mass than the Sun
Q5:What is abrown dwarf?
4Q6:We can use theStefan-Boltzmann lawto estimatestellar radii. If you wantto describe this law in a simplified form, which one would be the correct form?
Q7:Which one of the following statements is the best description for anaverage regionof theInterstellar Medium (ISM)?
Q8: Which one of the following statements aboutstar formationisnot correct?A.Stars form in cold and dense parts of the interstellar medium (ISM)B.Stars form by gravitational collapse of parts of ISM cloudsC.Stars form in the hot and low-density ISM bubblesD.The process can be triggered by an external effect, like a shockwave froman exploding nearby starE.A gravitationally unstable part of the ISM will always first fragment intonumerous smaller parts, which each then will form a new star
Q9:Why do we see theOrion nebulaglowing in apink/reddish colorin thevisible?
O/B stars which formed first
5Q10:How does the H-R diagram of avery young clusterlike thePleiadeslooklike?

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Term
Winter
Professor
Craig
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