Most ellipticals look smooth without resolved stars because a) they are high in
ID: 1305679 • Letter: M
Question
Most ellipticals look smooth without resolved stars because
a) they are high in mass
b) they are far away
c) they are red
d) they are old
e) all of the above
The centers of spirals are red and the disks are blue because
a) star formation occurs in the disk
b) young stars are in the bulge
c) old stars are in the disk
d) spirals have high rotation
e) spirals have a great deal of gas in the bulge
Which of the following is not true of irregular galaxies?
a) they are irregular in shape
b) they have a central nucleus
c) they are bluer than spiral disks
d) they have star forming regions within
e) they have no symmetry
The phrase `the flame that burns the brightest, burns the quickest' applies to stars because
a) bright stars are the hottest
b) high mass stars are the brightest
c) high mass stars are the bluest in color
d) blue stars are hot
e) bright stars have the shortest lifetimes
If a cloud of gas in the shape of a cube 10 light-years across collapses to form stars, and the mean density of the cloud is one solar mass per cubic light year, approximately how many solar mass stars will form? (hint: the volume of a cube is L3 and density is mass divided by volume)
a) 1 million
b) 1,000
c) 100
d) 1
e) can not determine from information given
Ellipticals are gas poor today because
a) they were formed with very little gas
b) all their gas was removed by gravity
c) they gas was used up early to form stars
d) all their gas dissolved
e) they have low rates of star formation
Explanation / Answer
Most ellipticals look smooth without resolved stars because
a) they are high in mass
b) they are far away
c) they are red
d) they are old
e) all of the above
The centers of spirals are red and the disks are blue because
a) star formation occurs in the disk
b) young stars are in the bulge
c) old stars are in the disk
d) spirals have high rotation
e) spirals have a great deal of gas in the bulge
Which of the following is not true of irregular galaxies?
a) they are irregular in shape
b) they have a central nucleus
c) they are bluer than spiral disks
d) they have star forming regions within
e) they have no symmetry
The phrase `the flame that burns the brightest, burns the quickest' applies to stars because
a) bright stars are the hottest
b) high mass stars are the brightest
c) high mass stars are the bluest in color
d) blue stars are hot
e) bright stars have the shortest lifetimes
If a cloud of gas in the shape of a cube 10 light-years across collapses to form stars, and the mean density of the cloud is one solar mass per cubic light year, approximately how many solar mass stars will form? (hint: the volume of a cube is L3 and density is mass divided by volume)
a) 1 million
b) 1,000
c) 100
d) 1
e) can not determine from information given
Ellipticals are gas poor today because
a) they were formed with very little gas
b) all their gas was removed by gravity
c) they gas was used up early to form stars
d) all their gas dissolved
e) they have low rates of star formation
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