14 Flashcards
A light-year is a measure of astronomical distance.
TRUE
About how old is the universe?
13.7 billion years
Compared to a magnitude 1 star, a star with a magnitude of 2 is
less than half as bright.
Compared to a star like the Sun, a blue-white star
All of the above.
Earth rotates
from west to east.
If the density of the universe is less than a critical value, then
it might continue expanding forever.
In which part of a newborn star does the fusion reaction occur?
the core
More massive stars tend to use up their supply of hydrogen more rapidly.
TRUE
Most of the stars plotted on a H-R diagram are
main sequence stars.
Nearby stars appear to move _____ relative to Polaris?
counter-clockwise
Nuclear fusion reactions occur in what part of a star?
core
Red giants are enormously bright because they are extremely hot.
TRUE
Stonehenge is an ancient observatory built in
England.
The Milky Way galaxy is
spiral.
The absolute magnitude considers the brightness of a star when at a standard distance.
TRUE
The difference in brightness between two stars is related to the
All of the above.
The eventual fate of our Sun is to become
a white dwarf.
The expected life span of a star the size of the Sun is
10 billion years.
The greater the apparent magnitude, the brighter the star.
FALSE
The number of degrees of arc that Polaris is above the horizon depends on
your latitude.
Where a main sequence star is located on the H-R diagram depends on its temperature and its
mass.
Which of the following depends on your location on Earth?
All of these depend on your location.
Which of the following is evidence for the existence of ‘dark matter’ in the universe?
The outlying stars in a galaxy appear to rotate more rapidly than expected.
Which of the following star colors has the highest temperature?
blue
