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Massive Astronomy Exam 2 Study Set With Complete answers_100- sure_.pdf
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8/22/24, 3:29 PMAstro 7N Exam 2
Jeremiah
Practice questions for this set
Terms in this set (88)
A high luminosity star Emits more light than a low-luminosity star
If a red giant appears the same brightness as The red giant
a red main sequence star, which one is
farther away?
The heaviest nuclei of all are formed... During a supernova explosion
Hydrogen-2 + proton = __ + energy: Helium-3
Which of the following has the smallest Neutron star
radius?
Why does the main sequence part of a star's The hydrogen in the core is exhausted.
life end?
Which of the following will have the shortest Main sequence star with surface temperature 20000 K
lifetime on the main sequence?
Many of the brightest 100 stars viewed from The most luminous stars are giants and supergiants that have already finished their main
Earth are not on the main sequence (even sequence lifetimes
though most stars are) because...
A 2-solar-mass main sequence star is the The 2 solar mass main sequence star appears brighter
same distance as a 0.2-solar-mass main
sequence star. Which star appears brighter?
The temperature of the photosphere of the 6000 Kelvin
Sun is closest to...
An estimate of the number of The average number of planets that could support life for each star were larger
communicating/technological civilizations
that we expect in our Galaxy would be a
larger number if...
If the sun had twice its mass, then which of Jupiter
these planets would be in its habitable
zone?
how do astronomers measure the By looking at which absorption lines are present in the star's spectrum.
temperature of stars?
The largest fraction of nearby stars (e.g. Red main sequence stars
within 100 light years) are...
The parallax angle of a nearby star is 50 parsecs
measured to be 0.02 arcseconds. What is the
distance to the star?
Which of the following is the sequence of Stellar nursery, protostar, blue star on main sequence, Type 2 supernova, black hole
events for a 40-solar mass star (one of the
most-massive stars)?
1/11
, 8/22/24, 3:29 PM
Star A is 9 times as luminous as Star B. The Star A is 3 times farther away than Star B.
two stars appear the same brightness. What
is true about their distance?
What is the name of the slightly cooler layer Chromosphere
of the Sun just outside the photosphere?
How does a star move on the H-R diagram It remains nearly fixed at a certain point on the main sequence and does not move on
during the period of time it is converting the H-R diagram.
hydrogen to helium in its core?
If the entire mass of Earth were A black hole
concentrated in a region the size of a
marble, the resulting object would be...
Which is the smallest object? A neutron star
A galaxy has an H-alpha emission line 0.1
observed at a wavelength 10 percent larger
than the rest wavelength of H-alpha. What is
the redshift of the galaxy?
Which is the most luminous? Quasar
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