The Penrose process has been proposed as a means of Aenergy extractionfrom a bla

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The Penrose process has been proposed as a means of
Aenergy extractionfrom a black hole.
Bwaking up students whohave fallen asleep during lectures about black holes.
Cdescending inside anevent horizon without falling all the way in.
Dincreasing the mass of ablack hole. 15. The no-hair theorem states that black holes
Aneverrotate.
Bnever explode.
Cmay be defined by onlythree properties: mass, charge and spin.
Dmay be defined by onlythree properties: mass, entropy and spin. 16. Cepheid variable stars are invaluable in astronomy because ofthe close relationship between
Atheir absolutemagnitude and their surface temperatures.
Btheir absolute magnitudeand their pulsation period.
Ctheir apparent magnitudeand their surface temperatures.
Dtheir apparent magnitudeand their pulsation period. 17. The famous Curtis-Shapley debate in 1920 concerned whichfundamental astronomical question in astronomy?
AWhether the spiral"nebulae" were part of the Milky Way Galaxy or more distant,separate entities.
BWhether the universe wasexpanding outward in all directions.
CWhether the Sun was atthe center of the Milky Way Galaxy.
DWhether all stars werelike the Sun, or fundamentally different. 18. What is it that makes the study of the structure of our owngalaxy more difficult than that of much more distant spiralgalaxies?
AMost of our galaxyis hidden behind dense gas and dust clouds in the galacticplane.
BThe galactic center isvisible only from the southern hemisphere where, until recently, nomajor telescopes were available for the study of galacticstructure.
COur galaxy is too close,such that photographs or images cannot be taken of the whole galaxyat any one time.
DOur star is within thegalaxy and its motion confuses the interpretation of the motion ofother parts of the galaxy. The method used by Harlow Shapley in 1917 to estimate theSun's location in our Galaxy was the measurement of
Athe locations ofglobular clusters around the Galaxy.
Bthe density of stars indifferent directions along the Milky Way.
Cdistances to open starclusters and H II regions in the disk of the Galaxy.
Dthe structure of theAndromeda galaxy and a comparison of this to the structure of ourgalaxy.

Explanation / Answer

QuestionDetails:
The method used by Harlow Shapley in 1917 to estimate theSun's location in our Galaxy was the measurement of
Athe locations ofglobular clusters around the Galaxy.
Bthe density of stars indifferent directions along the Milky Way.
Cdistances to open starclusters and H II regions in the disk of the Galaxy.
Dthe structure of theAndromeda galaxy and a comparison of this to the structure of ourgalaxy. Have fun! Have fun!

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