定1个最佳选项。
BlackHoles
1Blackholesca
bebestdescribedasasortofvacuum,sucki
gupeverythi
gi
spaceScie
tistshavediscoveredthatblackholescomefroma
explosio
ofhugestarsStarsthatare
eardeathca
olo
gerbur
duetolossoffuel,a
d
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becauseitstemperatureca
olo
gerco
trolthegravitatio
al重力的force,hydroge
e
dsupputti
gpressureo
tothestar’ssurfaceu
tilitsudde
lyexplodesthe
collapses
2Blackholescomefromstarsthataremadeofhydroge
,othergasesa
dafewmetalsWhe
theseexplodeitca
tur
i
toastellarmass恒星质量blackhole,whichca
o
lyoccurifthestarislargee
oughshouldbebiggertha
thesu
fortheexplosio
tobreakiti
topieces,a
dthegravitystartstocompacteverypiecei
totheti
iestparticleTrytoseea
dcompare:ifastarthat’ste
timesthesizeofthesu
e
dsupbei
gablackholethat’s
olo
gertha
70kilometers,the
theEarthwouldbecomeblackholethat’so
lyafractio
ofa
i
ch
3Objectsthatgetsuckedi
ablackholewillalwaysremai
there,
evertobreakfreeButrememberthatblackholesca
o
lygobbleup吞噬objectswithi
aspecificdista
cetoitIt’spossibleforalargestar
earthesu
tobecomeablackhole,butthesu
willco
ti
uetostayi
placeOrbits轨道do
otcha
gebecausethe
ewlyformedblackholeco
tai
sexactlythesameamou
tofmassaswhe
itwasastar,o
lythisitsmassistotallyco
tractedthatitca
e
dupas
obiggertha
astate
4Sofar,astro
omershavefiguredoutthatblackholesexistbecauseofAlbertEi
stei
’stheoryofrelativityI
thee
d,through
umerousstudies,theyhavediscoveredthatblackholestrulyexistSi
ceblackholestraplighta
ddo
otgive
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offlight,itis
otpossibletodetectblackholesviaatelescopeButastro
omersco
ti
uetoexploregalaxies银河系,spacea
dthesolarsystemtou
dersta
dhowblackholesItispossiblethatblackholesca
existformillio
sofyears,a
dlaterco
tributefurtherprocessi
galaxies,whichca
eve
tuallyleadtocreatio
of
ewe
titiesScie
tistsalsocreditblackholesashelpfuli
lear
i
ghowgalaxiesbega
toform
AWhathappe
stotheobjectsarou
dablackhole
BIsthereproofthatblackholesreallyexist
CHowwereblackholes
amed
DWhatarediffere
ttypesofblackholes
EWhatareblackholesmadeof
FHowareblackholesformed
23Paragraph1F
24Paragraph2E
25Paragraph3A
26Paragraph4B
27Blackholesareformedafter___D______
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28Whe
alargestarexplodesthegravitycompactseverypiecei
to____F_____
29A
ewlyformedblackholea
dthestaritcomesfromarr