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Astronomyl 209/l ASTRl 209l Finall Examl -l (Latestl 2026/l 2027l Update)l 100%l Verifiedl Questionsl &l Answersl |l Gradel A
Q:l Whichl ofl thel followingl bestl describesl howl galaxiesl arel distributedl onl largel scalesl inl thel universe?
Answer:
Galaxiesl appearl tol bel distributedl inl chainsl andl sheetsl thatl surroundl greatl voids
Q:l Givenl thel observedl averagel distancel betweenl galaxiesl today,l whichl statementl isl true?a)l thel fasterl thel pastl expansionl rate,l thel youngerl thel agel ofl thel universe b)l thel fasterl thel pastl expansionl rate,l thel olderl thel agel ofl thel universe c)l thel agel ofl thel universel dependsl onlyl onl thel averagel distancel betweenl galaxies
Answer:
a)l thel fasterl thel pastl expansionl rate,l thel youngerl thel agel ofl thel universe
Q:l Whyl werel astronomersl inl thel 1990sl surprisedl tol learnl thatl thel expansionl ratel ofl thel universel isl gettingl fasterl withl time?
Answer:
Theyl expectedl gravityl tol bel slowingl thel expansionl ratel withl time
Q:l Basedl onl currentl understanding,l whatl exactlyl isl causingl thel expansionl ofl thel universel tol accelerate?
Answer:
Wel don'tl know,l butl itl isl calledl 'darkl energy'
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Q:l Inl al mass-energyl censusl ofl thel universe,l whatl arel thel approximatel proportionsl ofl normall matter,l darkl matter,l andl darkl energy?
Answer:
27%l darkl matter,l 68%l darkl energy,l 5%l normall matter
Q:l Howl dol ellipticall galaxiesl typicallyl comparel tol spirall galaxies?
Answer:
Ellipticall galaxiesl arel redderl andl rounder
Q:l Howl doesl al lenticularl galaxyl differl froml al spirall galaxy?
Answer:
Itl hasl nol spirall arms
Q:l Whichl ofl thel followingl typesl ofl galaxiesl isl thel mostl commonl typel ofl galaxyl foundl inl largel clusters?a)l spirals b)l ellipticals c)l irregulars
Answer:
b)l ellipticals
Q:l Whyl dol spirall galaxiesl appearl bluel inl colour?
Answer:
Theirl lightl outputl isl dominatedl byl hot,l massivel bluel stars
Q:l Inl astronomy,l al standardl candlel isl anl objectl withl al known
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