Which/./of/./the/./following/./is/./NOT/./a/./general/./difference/./between/./a/./planet/./
and/./a/./star?/./
A././Planets/./are/./smaller/./than/./stars.
B././Planets/./are/./dimmer/./than/./stars.
C././All/./planets/./are/./made/./of/./rock/./and/./all/./stars/./are/./made/./of/./gas.
D././Planets/./orbit/./stars,/./while/./stars/./orbit/./the/./center/./of/./the/./galaxy././-
/./correct/./answer/./✔ ✔
C././All/./planets/./are/./made/./of/./rock/./and/./all/./stars/./are/./made/./of/./gas.
Our/./solar/./system/./consists/./of/./_________.
A././the/./Sun/./and/./several/./nearby/./stars,/./as/./well/./as/./the/./planets/./and/./other/./o
bjects/./that/./orbit/./these/./stars
B././the/./Sun/./and/./all/./the/./objects/./that/./orbit/./it
C././a/./few/./hundred/./billion/./stars,/./bound/./together/./by/./gravity
D././the/./Sun/./and/./the/./nine/./planets,/./and/./nothing/./else/./-/./correct/./answer/./✔
✔ B././the/./Sun/./and/./all/./the/./objects/./that/./orbit/./it
, A/./typical/./galaxy/./is/./a/./_________.
A././system/./consisting/./of/./one/./or/./a/./few/./stars/./orbited/./by/./planets,/./moons,/./
and/./smaller/./objects
B././nearby/./object/./orbiting/./a/./planet
C././large,/./glowing/./ball/./of/./gas-powered/./by/./nuclear/./energy
D././collection/./of/./a/./few/./hundred/./million/./to/./a/./trillion/./or/./more/./stars/./boun
d/./together/./by/./gravity/./
E././relatively/./small,/./an/./icy/./object/./orbiting/./a/./star/./-/./correct/./answer/./✔
✔
D././collection/./of/./a/./few/./hundred/./million/./to/./a/./trillion/./or/./more/./stars/./bo
und/./together/./by/./gravity
Which/./of/./the/./following/./best/./describes/./what/./we/./mean/./by/./the/./universe?
A././A/./vast/./collection/./of/./stars/./that/./number/./as/./many/./as/./the/./grains/./of/./san
d/./on/./all/./the/./beaches/./on/./Earth
B././All/./the/./galaxies/./in/./all/./the/./superclusters
C././The/./sum/./total/./of/./all/./mater/./and/./energy
D././The/./universe/./is/./another/./name/./for/./our/./Milky/./Way/./Galaxy././-
/./correct/./answer/./✔ ✔ C././The/./sum/./total/./of/./all/./mater/./and/./energy
What/./do/./astronomers/./mean/./by/./the/./Big/./Bang?
A././The/./event/./that/./marked/./the/./beginning/./of/./the/./expansion/./of/./the/./unive
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