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Astronomy 101 EXAM 3 Questions And
Answers |Latest 2025 | Guaranteed Pass.
The total amount of power (in watts, for example) that a star radiates into space is called its
_________. - Answer✔Luminosity
According to the inverse square law of light, how will the apparent brightness of an object
change if its distance to us triples? - Answer✔Its apparent brightness will decrease by a factor
of 9.
If star A is closer to us than star B, then Star A's parallax angle is _________. - Answer✔larger
Star A has an apparent magnitude of 3 and star B has an apparent magnitude of 5. Which star is
brighter in our sky? - Answer✔A
Which of the following terms is given to a pair of stars that we can determine are orbiting each
other only by measuring their periodic Doppler shifts? - Answer✔spectroscopic binary
What can we infer, at least roughly, from a star's luminosity class? - Answer✔its size (radius)
the remains of a star that ran out of fuel for nuclear fusion - Answer✔White Dwarf
It is the spectral type of the hottest main sequence star in a star cluster, and it tells us the
cluster's age. - Answer✔main-sequence turnoff point
All stars are born with the same basic composition, yet stars can look quite different from one
another. Which two factors primarily determine the characteristics of a star? - Answer✔Mass
and stage in life
1/parallax angle (arcsecond) - Answer✔distance (parsecs)
the magnitude it would have if it were a distance of 10 parsecs (32.6 light-years) away -
Answer✔Absolute magnitude
To calculate the masses of stars in a binary system, we must measure their _________
and_________. - Answer✔orbital period and average orbital distance
Before we can use parallax to measure the distance to a nearby star, we first need to know
__________. - Answer✔the Earth-Sun distance
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:25PM A+
apparent shift caused by a change in the way you are looking at an object, not an actual motion
- Answer✔parallax
stars are different from the sun in ________, __________,__________, _________ -
Answer✔Age, size luminosity, brightness
3 most fundamental properties of starts - Answer✔luminosity, surface temperature, mass
how bright stars look in sky - Answer✔Apparent brightness
how bright stars are in absolute sense - Answer✔Luminosity
brightest stars are______
second brightest are _______ - Answer✔first magnitude, second magnitude
________ magnitude means ___________stars - Answer✔Larger, dimmer OR
smaller, brighter
determine surface temperature from - Answer✔color or spectrum
highly ionized elements are _____ - Answer✔HOT
molecules are _______ - Answer✔cool
apply kelpers law to measure mass only in _________ - Answer✔Binary systems
pair of stars that we see distinctly as stars orbit each other - Answer✔Visual binary
a pair of stars that orbit in the plane of our line of sight - Answer✔Eclisping binary
detect binary nature by observing doppler shifts in spectral lines - Answer✔Spectroscopic
binary
graph of apparent brightness vs time - Answer✔light curve
can apply keplers 3rd law only if measured _________ and _________ of both stars -
Answer✔Orbital period and separation
luminostiy depends on both ________ and __________ - Answer✔surface temperature and
surface area(radii)
very large and very bright - Answer✔Supergiant
small and very high t - Answer✔white dwarf
stars luminosiy class is more related to ______ than _______ - Answer✔size, luminosity
designated by OBAFGKM, tells us surface T - Answer✔spectral lines
based on luminosity and tells us about stars radii - Answer✔Luminosity class
2
Astronomy 101 EXAM 3 Questions And
Answers |Latest 2025 | Guaranteed Pass.
The total amount of power (in watts, for example) that a star radiates into space is called its
_________. - Answer✔Luminosity
According to the inverse square law of light, how will the apparent brightness of an object
change if its distance to us triples? - Answer✔Its apparent brightness will decrease by a factor
of 9.
If star A is closer to us than star B, then Star A's parallax angle is _________. - Answer✔larger
Star A has an apparent magnitude of 3 and star B has an apparent magnitude of 5. Which star is
brighter in our sky? - Answer✔A
Which of the following terms is given to a pair of stars that we can determine are orbiting each
other only by measuring their periodic Doppler shifts? - Answer✔spectroscopic binary
What can we infer, at least roughly, from a star's luminosity class? - Answer✔its size (radius)
the remains of a star that ran out of fuel for nuclear fusion - Answer✔White Dwarf
It is the spectral type of the hottest main sequence star in a star cluster, and it tells us the
cluster's age. - Answer✔main-sequence turnoff point
All stars are born with the same basic composition, yet stars can look quite different from one
another. Which two factors primarily determine the characteristics of a star? - Answer✔Mass
and stage in life
1/parallax angle (arcsecond) - Answer✔distance (parsecs)
the magnitude it would have if it were a distance of 10 parsecs (32.6 light-years) away -
Answer✔Absolute magnitude
To calculate the masses of stars in a binary system, we must measure their _________
and_________. - Answer✔orbital period and average orbital distance
Before we can use parallax to measure the distance to a nearby star, we first need to know
__________. - Answer✔the Earth-Sun distance
1
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 1:25PM A+
apparent shift caused by a change in the way you are looking at an object, not an actual motion
- Answer✔parallax
stars are different from the sun in ________, __________,__________, _________ -
Answer✔Age, size luminosity, brightness
3 most fundamental properties of starts - Answer✔luminosity, surface temperature, mass
how bright stars look in sky - Answer✔Apparent brightness
how bright stars are in absolute sense - Answer✔Luminosity
brightest stars are______
second brightest are _______ - Answer✔first magnitude, second magnitude
________ magnitude means ___________stars - Answer✔Larger, dimmer OR
smaller, brighter
determine surface temperature from - Answer✔color or spectrum
highly ionized elements are _____ - Answer✔HOT
molecules are _______ - Answer✔cool
apply kelpers law to measure mass only in _________ - Answer✔Binary systems
pair of stars that we see distinctly as stars orbit each other - Answer✔Visual binary
a pair of stars that orbit in the plane of our line of sight - Answer✔Eclisping binary
detect binary nature by observing doppler shifts in spectral lines - Answer✔Spectroscopic
binary
graph of apparent brightness vs time - Answer✔light curve
can apply keplers 3rd law only if measured _________ and _________ of both stars -
Answer✔Orbital period and separation
luminostiy depends on both ________ and __________ - Answer✔surface temperature and
surface area(radii)
very large and very bright - Answer✔Supergiant
small and very high t - Answer✔white dwarf
stars luminosiy class is more related to ______ than _______ - Answer✔size, luminosity
designated by OBAFGKM, tells us surface T - Answer✔spectral lines
based on luminosity and tells us about stars radii - Answer✔Luminosity class
2
