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Astronomyl 209/l ASTRl 209l Alll Assignmentsl -l (Latestl 2026/l 2027l Update)l 100%l Verifiedl Questionsl &l Answersl |l Gradel A
Q:l Whichl ofl thel followingl didl NOTl happenl duringl thel firstl fewl minutesl afterl thel Bigl Bang?a)l somel veryl massivel earlyl starsl formed b)l energyl wasl convertedl tol matter c)l matterl andl antimatterl collidedl andl turnedl intol energy d)l temperaturesl throughoutl thel universel werel hotterl thanl thel coresl ofl starsl arel today e)l twol orl threel ofl thel simplestl elementsl fusedl together
Answer:
a)
Q:l Today,l wel believel thatl onlyl al smalll numberl ofl elementsl werel actuallyl formedl
duringl thel Bigl Bang.l Whichl ofl thel followingl wasl NOTl onel ofl these:
a)l hydrogen b)l carbon c)l lithium d)l helium e)l youl can'tl fooll me,l alll ofl thel abovel werel definitelyl formedl duringl thel bigl bang
Answer:
b)
Q:l Atl aboutl 1l secondl afterl thel beginningl ofl thel universe,l onel typel ofl particlel wasl ablel tol startl travelingl freelyl throughl thel universe.l Thesel particlesl arel stilll withl us,l butl
theyl arel extremelyl hardl tol detect.l Theyl arel called:
- / 4
Answer:
-l Neutrinos
Q:l Astronomersl havel measuredl thatl therel isl morel heliuml inl thel universel thanl canl bel explainedl byl thel fusionl inl starsl overl thel lastl 13l billionl years.l Howl dol theyl thinkl thel extral heliuml gotl intol thel universe?
Answer:
-l Thel extral heliuml wasl madel duringl thel firstl fewl minutesl ofl thel Bigl Bang,l whenl thel entirel universel wasl hotl enoughl forl fusionl tol occurl briefly
Q:l Whichl ofl thel followingl isl prettyl goodl evidencel thatl thel universel beganl withl al Bigl Bang?a)l thel factl thatl galaxiesl collide b)l thel factl thatl alll thel galaxiesl arel movingl towardl us c)l thel factl thatl starsl explode d)l thel existencel ofl al doublel starl systeml likel Cygnusl X-1 e)l thel 3-degreel cosmicl microwavel backgroundl radiation
Answer:
e)
Q:l Afterl thel Bigl Bang,l inl orderl forl thel universel tol becomel transparentl tol lightl andl otherl electro-magneticl radiation,l whatl hadl tol happen?
Answer:
-l Thel densityl ofl thel universel hadl tol decreasel (tol 1000l nucleil perl cubicl centimetrel orl less)
Q:l Accordingl tol thel modelsl ofl thel universel wel discussedl inl thisl course,l whyl dol thel galaxiesl movel apartl (whyl dol wel havel Hubble'sl law)?
Answer: 2 / 4
-l Asl al resultl ofl thel Bigl Bang,l spacel itselfl isl stretching,l andl thisl stretchingl carriesl thel galaxiesl awayl froml eachl other
Q:l Accordingl tol ourl textbook,l roughlyl whatl percentl ofl thel massl andl energyl contentsl ofl thel universel isl madel upl ofl darkl matterl plusl darkl energy?
Answer:
-l 95%
Q:l Atl first,l rightl afterl thel Bigl Bang,l thel universel wasl tool hotl forl nucleil andl electronsl tol combinel intol thel kindsl ofl neutrall atomsl thatl arel familiarl tol usl today.l Howl soonl afterl thel beginningl didl itl becomel cooll enoughl forl neutrall atomsl tol form?
Answer:
-l Al fewl hundredl thousandl years
Q:l Williaml Herschell thoughtl thatl thel Sunl andl Earthl werel roughlyl atl thel centerl ofl thel greatl groupingl ofl starsl wel calll thel Milkyl Way.l Todayl wel knowl thisl isl notl thel case.l Whatl wasl al keyl reasonl thatl Herschell didl notl realizel ourl truel positionl inl thel Milkyl Way?
Answer:
-l Thel dustl thatl extendsl throughoutl thel diskl ofl thel Galaxyl onlyl allowedl Herschell tol seel thel smalll partl ofl thel Milkyl Wayl thatl surroundsl us
Q:l Whatl objectsl didl Harlowl Shapleyl usel asl signpostsl tol figurel outl thel extentl ofl thel Milkyl Wayl Galaxyl andl thel locationl ofl itsl center?
Answer:
-l Globularl clusters
Q:l Whatl havel wel learnedl froml thel workl ofl Harlowl Shapleyl andl othersl aboutl thel locationl ofl thel Sunl inl thel Milkyl Wayl Galaxy? 3 / 4
Answer:
-l Wel arel inl thel diskl ofl thel Galaxy,l aboutl 3/5l ofl thel wayl froml thel centre
Q:l Astronomersl nowl knowl thatl surroundingl thel mainl bodyl ofl ourl Galaxyl (whichl ourl variousl kindsl ofl telescopesl havel shownl tol us)l andl ourl fainterl halol ofl starsl therel is:
Answer:
-l Anl invisiblel halol madel ofl whatl astronomersl arel callingl darkl matter
Q:l Whichl ofl thel followingl statementsl aboutl thel nuclearl bulgel ofl ourl Galaxyl isl
FALSE?
a)l thel bestl wayl tol learnl morel aboutl itl isl tol observel higherl energyl radiation,l suchl asl ultravioletl andl x-rays b)l itl typicallyl consistsl ofl olderl stars c)l therel isl evidencel thatl itl isl notl exactlyl spherical,l butl elongated d)l itl isl significantlyl thickerl thanl thel diskl ofl thel Galaxy e)l itl isl difficultl forl usl tol seel withl visiblel lightl becausel ofl cosmicl dust
Answer:
a)
Q:l Radiol astronomyl hasl playedl al pivotall rolel inl showingl usl thel detailedl structurel ofl thel Milkyl Wayl Galaxy.l Whichl ofl thel followingl techniquesl wouldl al radiol astronomerl usel asl anl essentiall partl ofl anl investigationl ofl thisl structure?a)l measuringl thel Dopplerl shiftl ofl al linel inl al radiol spectrum b)l takingl al photographl ofl thel skyl inl thel directionl ofl thel Bigl Dipper c)l usingl al CCDl andl al filterl tol recordl thel amountl ofl lightl froml thel starsl inl al nearbyl openl cluster d)l measuringl thel amountl ofl synchrotronl radiationl froml thel Crabl Nebula e)l measuringl thel amountl ofl radiol radiationl comingl froml thel directionl ofl Jupiterl andl otherl planetsl inl thel solarl system
Answer:
a)
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