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ASTR 1010 Final Vanderbilt (2025) ACTUAL EXAM
comprehensive questions and verified accurate
solution (Detailed & Elaborated)|get it 100%
accurate!! 2025 TEST!!
dark energy + evidence - (answers)a mysterious repulsive force that appears to be
causing the expansion of the universe to accelerate
Type Ia supernovae as standard candles; Hbl law says they should be moving
faster there; inverse square law for light dictates that dimmer = farther;
calculated dstncs to things are even farther than their redshift predicts; they are
being pushed away
dark matter + evidence - (answers)matter (gravity, attractive force) that does not
give off electromagnetic radiation but is quite abundant in the universe
rotation curves, ultra-faint galaxies, gravitational lensing, Coma Cluster + Zwicky,
Bullet Cluster
proton-proton chain - (answers)high density + high heat needed
P + P -> H2 + e⁻ + neutrino
H2 + P -> He3 + gamma ray
He3 + He3 -> He4 + 2P
, 2
radioactive decay - (answers)the process by which radioactive isotope breaks
down into a stable isotope of same/another element; each half-life leaves half of
existing population of radioactive isotope
star cluster + special properties - (answers)gravitationally bound stars formed
from the same gas cloud; all about same dstnc from Earth, all about same age;
open clusters have countable stars, globular clusters have too many to count
(stable for like, ever with that much gravity)
main sequence fitting - (answers)measuring the distance to a star cluster by
comparing the apparent brightness of the cluster's main sequence with that of
the standard main sequence
white dwarfs + special properties - (answers)inert core of dead red giant; stable
size due to degeneracy pressr, DENSE (Earth size, Sun mass), can't generate new
energy, cool off, gradually grow fainter
period-luminosity diagram - (answers)plots logarithmic relatnshp btwn cepheids'
varblty pd length and abs L; given abs L + apparent L, we can estimt dstnc to
cepheid + of obj in which it resides
cepheid variable stars - (answers)variable star w/ irregular varblty trend, rapidly
brightening, fading progressively slower till 3/4 down, then rapidly
finishing/repeating; variatn related to intrinsic luminosity, i.e. their size/temp
changing
ASTR 1010 Final Vanderbilt (2025) ACTUAL EXAM
comprehensive questions and verified accurate
solution (Detailed & Elaborated)|get it 100%
accurate!! 2025 TEST!!
dark energy + evidence - (answers)a mysterious repulsive force that appears to be
causing the expansion of the universe to accelerate
Type Ia supernovae as standard candles; Hbl law says they should be moving
faster there; inverse square law for light dictates that dimmer = farther;
calculated dstncs to things are even farther than their redshift predicts; they are
being pushed away
dark matter + evidence - (answers)matter (gravity, attractive force) that does not
give off electromagnetic radiation but is quite abundant in the universe
rotation curves, ultra-faint galaxies, gravitational lensing, Coma Cluster + Zwicky,
Bullet Cluster
proton-proton chain - (answers)high density + high heat needed
P + P -> H2 + e⁻ + neutrino
H2 + P -> He3 + gamma ray
He3 + He3 -> He4 + 2P
, 2
radioactive decay - (answers)the process by which radioactive isotope breaks
down into a stable isotope of same/another element; each half-life leaves half of
existing population of radioactive isotope
star cluster + special properties - (answers)gravitationally bound stars formed
from the same gas cloud; all about same dstnc from Earth, all about same age;
open clusters have countable stars, globular clusters have too many to count
(stable for like, ever with that much gravity)
main sequence fitting - (answers)measuring the distance to a star cluster by
comparing the apparent brightness of the cluster's main sequence with that of
the standard main sequence
white dwarfs + special properties - (answers)inert core of dead red giant; stable
size due to degeneracy pressr, DENSE (Earth size, Sun mass), can't generate new
energy, cool off, gradually grow fainter
period-luminosity diagram - (answers)plots logarithmic relatnshp btwn cepheids'
varblty pd length and abs L; given abs L + apparent L, we can estimt dstnc to
cepheid + of obj in which it resides
cepheid variable stars - (answers)variable star w/ irregular varblty trend, rapidly
brightening, fading progressively slower till 3/4 down, then rapidly
finishing/repeating; variatn related to intrinsic luminosity, i.e. their size/temp
changing
