halo stars
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-0.02-0.2% heavy elements (O, Fe)
-only old stars
-stars formed first, then stopped
flat rotation curve
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-bc of this, there should be = amount of mass distributed everywhere
throughout galaxy's disk and halo
-most accurate mass curve for our galaxy
-missing mass is dark matter: massive objects (matter) that are (is)
distributed evenly around the galaxy in both the halo and disk
, -spiral galaxies all tend to have flat rotation curves indicating large
amounts of dark matter
open cluster
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-few hundred to few thousand loosely packed stars
-young
-location in galaxy: disk
-stars are loosely packed
spiral arms
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-contain most of the bright, blue O and B type stars
-since O stars have such a short lifetime, it must be that the arms of spiral
galaxies, are where star formation occurs
*when stars form, stars of all types form, but the O types outshine others
-not permanent structures, they are locations where stars are forming
-caused by spiral density waves- spiral shaped disturbances traveling
through the disk of the galaxy that compressed gas and triggers star
formation
Q20.07 The Hubble Plot shown represents a universe with an expansion rate that _______
over time
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, C) remains constant
Q17.03 In a spiral galaxy, the orbital speeds far from the galaxy's center ________ as the
distance from the center increases
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C) are approx the same
emission line spectrum
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-hot gas will show an emission (or line) spectrum (dark
background w/ bright lines)
-each element has own unique set of spectral lines
-observing fingerprints (combination of lines or colors
present) in a spectrum tells us which kinds of atoms are
present
-kirchhoff's law #2
celestial sphere
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, -imaginary object that has no basis in physical reality
-earth at center and all stars same distance from earth
-earth fixed and doesn't rotate
-entire celestial sphere rotated once a day around the earth from east to
west, causing the daily motion of the sky
other important observations (galileo)
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-phases of venus required a heliocentric system to explain
-moons of jupiter were orbiting jupiter- stuff orbited other than earth
solar wind
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-flow of charged particles from the surface of the sun
Q19.03 Galaxy A and B both observed to have cepheid variable stars. Both cepheids
have the same apparent magnitude. Cepheid in Galaxy A has a period of 10 days while
Cepheid in Galaxy B has a period of 30 days. Which Cepheid is actually brighter?
Give this one a try later!
Give this one a try later!
-0.02-0.2% heavy elements (O, Fe)
-only old stars
-stars formed first, then stopped
flat rotation curve
Give this one a try later!
-bc of this, there should be = amount of mass distributed everywhere
throughout galaxy's disk and halo
-most accurate mass curve for our galaxy
-missing mass is dark matter: massive objects (matter) that are (is)
distributed evenly around the galaxy in both the halo and disk
, -spiral galaxies all tend to have flat rotation curves indicating large
amounts of dark matter
open cluster
Give this one a try later!
-few hundred to few thousand loosely packed stars
-young
-location in galaxy: disk
-stars are loosely packed
spiral arms
Give this one a try later!
-contain most of the bright, blue O and B type stars
-since O stars have such a short lifetime, it must be that the arms of spiral
galaxies, are where star formation occurs
*when stars form, stars of all types form, but the O types outshine others
-not permanent structures, they are locations where stars are forming
-caused by spiral density waves- spiral shaped disturbances traveling
through the disk of the galaxy that compressed gas and triggers star
formation
Q20.07 The Hubble Plot shown represents a universe with an expansion rate that _______
over time
Give this one a try later!
, C) remains constant
Q17.03 In a spiral galaxy, the orbital speeds far from the galaxy's center ________ as the
distance from the center increases
Give this one a try later!
C) are approx the same
emission line spectrum
Give this one a try later!
-hot gas will show an emission (or line) spectrum (dark
background w/ bright lines)
-each element has own unique set of spectral lines
-observing fingerprints (combination of lines or colors
present) in a spectrum tells us which kinds of atoms are
present
-kirchhoff's law #2
celestial sphere
Give this one a try later!
, -imaginary object that has no basis in physical reality
-earth at center and all stars same distance from earth
-earth fixed and doesn't rotate
-entire celestial sphere rotated once a day around the earth from east to
west, causing the daily motion of the sky
other important observations (galileo)
Give this one a try later!
-phases of venus required a heliocentric system to explain
-moons of jupiter were orbiting jupiter- stuff orbited other than earth
solar wind
Give this one a try later!
-flow of charged particles from the surface of the sun
Q19.03 Galaxy A and B both observed to have cepheid variable stars. Both cepheids
have the same apparent magnitude. Cepheid in Galaxy A has a period of 10 days while
Cepheid in Galaxy B has a period of 30 days. Which Cepheid is actually brighter?
Give this one a try later!
