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astro FINAL EXAM part 1
Terms in this set (48)
What is the reason for the seasons on earth?
earth is tilted with respect to the sun by about 23.5 degrees
say that our moon was Full on May 1,2007. When was the next first quarter phase after that full moon?
from earth, in which type of constellation might you find the planet saturn?
only in a zodiac constellation
i detect a star giving off more ultraviolet light than green light. what property of the star can i estimate with this information?
one of the lines of hydrogen has a wavelength of 121/6 nm. if a cloud of hydrogen gas is moving TOWARDS us at 200 km/s, what will we detect?
an emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm
say you are in the bottom of happy valley. how does the force of gravity compare to what it would be on top of mount nittany?
slightly greater in happy valley than on mount nittany
which is the greater force due to gravity?
that between the sun and the earth
a lunar eclipse can occur
only during a full moon
when is the longest night in the southern hemisphere?
where was the sun located on the day you were born?
in the constellation of your zodiac
a blackbody spectrum of an object with a lower temperature has
a peak at a longer wavelength
telescopes above earth's atmosphere are better because
they give clearer images without atmospheric blurring
for every action there is an equal and opposite reaction. this means that
a planet exerts an equal force on the sun as the sun does on the planet
what is the main constituent of the atmosphere of venus
the planets of the solar system were formed
as individual condensation/accretion centers in a rotating solar nebula
planet A has an orbit with a semi-major axis of 3 astronomical units. Planet B has an orbit with a semi-major axis of 12 astronomical units. how does the orbital period compare between the two planets? use p^2=a^3 to estimate.
planet b has an orbital period 8 times longer than planet a
why does mars have seasons?
its axis is tilted relative to its orbital plane
which is smallest?
saturn's moon enceladus
which fact about mars is NOT true?
mars has a thicker atmosphere than earth does
the material in a meteorite is
roughly as old as the solar
which solar system planet has exactly two moons?
which planet moves fastest in its orbit around the sun, and when in its orbit is it fastest?
mercury when it is at the closest point in its orbit to the sun
why do the orbits of the planets all lie in nearly the same place?
the early solar nebula flattened into a disk
what causes an aurora?
solar wind particles that hit atmospheric gas
"terra" and "maria" are terms describing
the light and dark colored features on the moon
what fraction of the solar system's mass is in the sun?
which is the longest time?
the time it takes for a photon to pass through the radiative zone of the sun
which star is the closest if all have the same apparent brightness?
a planetary nebula
is the ejected envelope of a low intermediate mass star
in nuclear fusion, energy is produced because
the mass of the reacting chemicals is larger than that of the products
what happens when you drop a clock into a black whole
the clock appears to be advancing slowly from the point of view of an outside observer, but normally of an observer falling with the clock
which statement about the milky way galaxy is TRUE?
most stars in the milky way halo are old and red
how does the apparent brightness of a star change depending on the distance to the star?
it decreases as the square of the distance
not counting the core, which is the hottest layer of the sun?
why can nothing (including light) escape a black hole?
the required escape velocity exceeds the speed of light
most of the planets discovered outside our solar system were discovered because they
make their host stars wobble around such that the velocity could be detected by the doppler effect
the coolest, least luminous starts are
in the lower right corner of the hertzprung-russell diagram
why can't we see back the whole way to the big bang?
the radiation scatters off matter frequently so the universe is opaque
what element is only produced in a supernova explosion?
what type of boson is responsible for the electromagnetic force?
compared to spiral galaxies, elliptical galaxies have:
less gas, less dust, and less new star formation
what do quasars look like from earth?
individual stars in the milky way
how do astronomers measure the mass of a supermassive black hole?
by measuring the speed at which stars move in its vicinity
what fraction of the energy density of the universe consists of dark matter?
in your body, which is the most common of the following types of particles?
we believe most of the helium in the universe was made
in the big bang
hubble's law states that the hubble constant times in the distance to a galaxy is equal to
the recessional velocity of the galaxy
how old is the universe?
13.4 billion years
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