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Ch.27 Star
Star constellations
40
Science
11th Grade
11/03/2014

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Cards

Term
is the sun the star nearest to the earth?
Definition
true
Term
what are most constellations named after?
Definition
for real or imaginary animals/Greek gods, and heros
Term
the milky way is an example of what type of galaxy?
Definition
spiral galaxy
Term
are stars are distributed unevenly in n irregular galaxy?
Definition
true
Term
are spiral galaxies are smaller and fainter than other types of galaxies?
Definition
false
Term
the color of a star in category O in the table above would most likely be what?
Definition
blue
Term
a star in category G in the table above would most likely be what?
Definition
yellow
Term
a device for separating light into different colors is known as a what?
Definition
spectroscope
Term
starlight passing through a device for separating light produces a display of colors and lines called a what?
Definition
spectrum
Term
an apparent shift in the wavelength of light emitted by a light source moving toward or away from an observer is known as what?
Definition
doppler effect
Term
a star moving toward the earth would display a ___ shift?
Definition
blue
Term
a star that had blue-shifted spectrum is most likely moving which direction?
Definition
towards earth
Term
the apparent change in the position of an object resulting from a change in the angle or in the position from which it is viewed is called what?
Definition
parallax
Term
how far is the sun from the earth in light minutes?
Definition
8.3 light minutes
Term
a star that experiences regular changes in brightness over time is called a what?
Definition
Cepheid variable
Term
in which region of the diagram does the sun lie?
Definition
region b
Term
what type of star is generally located in region A of this H-R diagram?
Definition
White dwarfs
Term
a star with what apparent magnitudes would appear brightest?
Definition
negative are brightest
Term
the apparent magnitude of a star is a measure of its what?
Definition
brightness from earth
Term
what apparent magnitudes is dimmest?
Definition
positive numbers are dimmest
Term
what stage of stellar evolution is the sun experiencing at this time?
Definition
main sequence
Term
a plot of surface temp. of stars against their absolute magnitude is called what?
Definition
HR diagram
Term
what is the earliest stage in the dev. of a star?
Definition
protostar/ nebula
Term
nuclear fusion begins when tem within a protostar reach over what?
Definition
10,000,000
Term
the process i which smaller atomic nuclei combine into larger atomic nuclei is known as what?
Definition
nuclear fusion
Term
which type of star maintains a stable size because the energy from fusion balances the force of gravity?
Definition
main sequence
Term
what stage in stellar evolution is the largest
Definition
main sequence
Term
a pulsar is a type of what?
Definition
neutron star
Term
the end of which stage of stellar evolution is marked by the end of helium fusion?
Definition
red giants
Term
what stage in a star evolution follows fusion of heavy elements into iron?
Definition
supernove
Term
in the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a what?
Definition
black hole
Term
in which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a stars outer shell to expand?
Definition
giants
Term
stars that emits two beams of radiation that can be detected as radio waves are called what
Definition
pulsars
Term
when a white dwarf star no longer emits energy, it may become a what?
Definition
black dwarf
Term
what stage in the life of a star 10 times move massive that the sun is missing in this chart
Definition
red giants
Term
astromomers label the stars in a constellation according to their what?
Definition
apparent magnitude
Term
large-scale groups of stars bound together by gravitional attraction are known as what?
Definition
galaxies
Term
a photograph of the motion of stars in the northern sky during an expended period shows a pattern of curved trails explain what causes this apparent motion of the stars
Definition
earth rotated on its axis earth revolves around the sun
Term
how do astronomers try to locate black holes?
Definition
look for absences or gives off x rays
Term
the core of a start ois five times more massive than the sun and is composed mostly of helium and carbon. which stage of stellar evolution is the star most likely in? why?
Definition
red giants used up hydrogen
fusing helium to carbon
much larger than the sun
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