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Astronomyl 209/l ASTRl 209l Alll Quizzesl -l (Latestl 2026/l 2027l Update)l 100%l Verifiedl Questionsl &l Answersl |l Gradel A
Q:l Approximatelyl howl longl havel cosmicl microwavel backgroundl photonsl beenl travelingl throughl space?
Answer:
14l billionl yearsl —>l Samel approxl agel ofl thel universe
Q:l Whyl didl thel Bigl Bangl notl producel al significantl proportionl ofl elementsl heavierl thanl helium?
Answer:
Byl thel timel heliuml nucleil couldl survive,l thel temperaturel hadl becomel tool lowl forl heavierl elementsl tol form.
Q:l Whatl evidencel doesl thel observationsl producedl byl thel Planckl telescopel support?
Answer:
Bothl thel Bigl Bangl andl inflation.
Q:l Whatl doesl thel geometryl ofl thel universel bingl curvedl andl notl flatl suggest?
Answer:
Thel inflationl modell wasl incorrect.
Q:l Whyl isl darkl matterl calledl "darkl matter"?
Answer: 1 / 4
Itl doesl notl interactl stronglyl withl lightl butl itl doesl havel gravityl likel otherl matter
Q:l Howl isl thel distributionl ofl thel darkl matterl inl al spirall galaxyl described?
Answer:
Approxl sphericall andl aboutl 10l timesl thel sizel ofl thel galaxyl halo
Q:l Truel orl False?l Galaxiesl withl higherl orbitall speedsl havel lowerl totall mass?
Answer:
False.l Thel higherl theirl orbitall speedsl thel morel massl theyl have.
Q:l Howl canl wel concludel thel existencel ofl darkl matterl inl clustersl ofl galaxies?
Answer:
Thel highl temperaturel andl distributionl ofl gasl betweenl thel galaxiesl inl clusters
Q:l Whatl isl meantl byl gravitationall lensing?
Answer:
Al massivel objectl bendsl lightl beaml thatl arel passingl nearbyl (Einsteinl theoryl relativity)
Q:l Whatl isl thel majorl evidencel forl existencel ofl darkl matter?
Answer:
Thel expansionl ofl thel universe
Q:l Whatl arel thel speedsl thatl galaxiesl sometimesl havel thatl deviatel somewhatl froml speedsl predictedl byl Hubble'sl Law?
Answer: 2 / 4
Recessionl speeds
Q:l Whatl dol recessionl speedsl reveal?
Answer:
Velocitiesl duel tol thel gravitationall tugsl ofl nearbyl galaxiesl orl clustersl ofl galaxies.
Q:l Howl dol astronomersl createl al threel dimensionall mapsl ofl thel universe?
Answer:
byl measuringl thel skyl positionsl andl redshiftsl ofl manyl galaxies
Q:l Howl arel galaxiesl distributedl onl largel scalesl inl thel universe?
Answer:
Inl chainsl andl sheetsl thatl surroundl greatl voids
Q:l Truel orl False?l Givenl thel observedl averagel distancel betweenl galaxiesl today,l Thel fasterl thel pastl expansionl rate,l thel olderl thel agel ofl thel universe.
Answer:
False.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 Whatl exactlyl isl causingl thel expansionl ofl thel universel tol accelerate?
- / 4
Answer:
Wel don'tl knowl forl certainl butl wel calll itl "darkl energy"?
Q:l Whatl arel thel approximatel proportionsl ofl normall matter,l darkl matter,l andl darkl energy?
Answer:
27%l ->l Darkl matter 68%l ->l Darkl Energy 5%l ->l Normall matter
Q:l Howl canl wel describel starl inl thel halol ofl ourl Galaxy?
Answer:
Old,l redl andl diml withl lowl abundancel ofl heavyl elements
Q:l Whatl isl expectedl tol bel veryl commonl inl globularl clusters?
Answer:
Low-massl main-sequencel stars
Q:l Truel orl False?l Thel typicall agel ofl diskl starsl isl greaterl thanl thatl ofl halol stars.
Answer:
False.
Q:l Truel orl False?l Diskl starsl arel alll youngerl thanl 5l billionl years
Answer:
False
- / 4
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