AST/./101/./SBU
How/./many/./stars/./are/./in/./the/./Milky/./Way/./Galaxy?/./-/./correct/./answer/./✔
✔ ~100/./billion
What/./is/./our/./galaxy/./called?/./-/./correct/./answer/./✔ ✔
Milky/./Way/./Galaxy
What/./are/./the/./primary/./features/./of/./the/./structure/./of/./our/./galaxy?/./-
/./correct/./answer/./✔ ✔ 1././Disk/./--flat/./structure/./(stars,/./gas,/./and/./dust)/./
2././Bulge/./-/./central/./spherical/./component/./(mostly/./stars)/./
3././Halo/./-/./outer/./spherical/./component/./(globular/./clusters,/./dark/./matter)
What/./is/./the/./motion/./of/./halo/./stars?/./-/./correct/./answer/./✔ ✔
Halo/./stars/./travel/./high/./above/./and/./far/./below/./the/./disk/./on/./orbits/./with/./r
andom/./orientations.
, What/./is/./the/./motion/./of/./bulge/./stars?/./-/./correct/./answer/./✔ ✔
Bulge/./stars/./also/./have/./orbits/./with/./random/./orientations.
What/./is/./the/./motion/./of/./disk/./stars?/./-/./correct/./answer/./✔ ✔
Disk/./stars/./orbit/./in/./circles/./with/./the/./same/./orientation,/./except/./for/./a/./litt
le/./up-and-down/./motion.
What/./is/./the/./importance/./of/./the/./motion/./of/./the/./stars?/./-/./correct/./answer/./
✔ ✔
These/./motions/./support/./the/./structures/./of/./our/./Galaxy/./against/./gravitati
onal/./collapse.
star-gas-star/./cycle/./-/./correct/./answer/./✔ ✔
the/./process/./of/./galactic/./recycling/./in/./which/./stars/./expel/./gas/./into/./space,/
./where/./it/./mixes/./with/./the/./interstellar/./medium/./and/./eventually/./forms/./ne
w/./stars
Atomic-hydrogen/./clouds/./-->/./molecular/./clouds/./-->/./star/./formation/./--
>/./nuclear/./fusion/./in/./stars/./-->/./returning/./gas/./-->/./hot/./bubbles/./--
>/./back/./to/./molecular/./clouds
Where/./does/./gas/./recycling/./occur/./most?/./-/./correct/./answer/./✔ ✔
In/./the/./galactic/./disk.
How/./many/./stars/./are/./in/./the/./Milky/./Way/./Galaxy?/./-/./correct/./answer/./✔
✔ ~100/./billion
What/./is/./our/./galaxy/./called?/./-/./correct/./answer/./✔ ✔
Milky/./Way/./Galaxy
What/./are/./the/./primary/./features/./of/./the/./structure/./of/./our/./galaxy?/./-
/./correct/./answer/./✔ ✔ 1././Disk/./--flat/./structure/./(stars,/./gas,/./and/./dust)/./
2././Bulge/./-/./central/./spherical/./component/./(mostly/./stars)/./
3././Halo/./-/./outer/./spherical/./component/./(globular/./clusters,/./dark/./matter)
What/./is/./the/./motion/./of/./halo/./stars?/./-/./correct/./answer/./✔ ✔
Halo/./stars/./travel/./high/./above/./and/./far/./below/./the/./disk/./on/./orbits/./with/./r
andom/./orientations.
, What/./is/./the/./motion/./of/./bulge/./stars?/./-/./correct/./answer/./✔ ✔
Bulge/./stars/./also/./have/./orbits/./with/./random/./orientations.
What/./is/./the/./motion/./of/./disk/./stars?/./-/./correct/./answer/./✔ ✔
Disk/./stars/./orbit/./in/./circles/./with/./the/./same/./orientation,/./except/./for/./a/./litt
le/./up-and-down/./motion.
What/./is/./the/./importance/./of/./the/./motion/./of/./the/./stars?/./-/./correct/./answer/./
✔ ✔
These/./motions/./support/./the/./structures/./of/./our/./Galaxy/./against/./gravitati
onal/./collapse.
star-gas-star/./cycle/./-/./correct/./answer/./✔ ✔
the/./process/./of/./galactic/./recycling/./in/./which/./stars/./expel/./gas/./into/./space,/
./where/./it/./mixes/./with/./the/./interstellar/./medium/./and/./eventually/./forms/./ne
w/./stars
Atomic-hydrogen/./clouds/./-->/./molecular/./clouds/./-->/./star/./formation/./--
>/./nuclear/./fusion/./in/./stars/./-->/./returning/./gas/./-->/./hot/./bubbles/./--
>/./back/./to/./molecular/./clouds
Where/./does/./gas/./recycling/./occur/./most?/./-/./correct/./answer/./✔ ✔
In/./the/./galactic/./disk.
