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90 Cards in this Set

  • Front
  • Back
the annual or yearly motion of the earth occurs because of the
real orbital motion of the earth and the sun
which object is at the center of the celestial sphere
earth
a parsec is a unit of
distance
the South Celestial Pole
the projection of the earths south pole on the the celestial sphere
the celestial equator is the
projection of the earths equator onto the celestial sphere
the obliquity of the ecliptic is the same as the tilt of the ____ axis of rotation
earths
the obliquity of the ecliptic is the
angle between the celestial equator and the ecliptic
degree of th obliquity of the ecliptic
23.5 degrees
for an observer at the earth's north pole, all stars above the horizon
are circumpolar
the observer's meridian is a semi-circle through the
NCP, SCP zenith and np of hte horizon
the observers meridian is a semi-circle through the
ncp scp zenith and south point on thehorizon
declination of a star is the equivalent to
latitude on the celestial sphere
the precession of the earth takes
26000 years
nutation vs precession
precession has a bigger effect
sideral orbit of hte moon is
its orbital period with respect to the stars
the apparent shifting of the position of mars bc of earths orbital motion is called
retrograde motion
hipparcus wanted to prove the heliocentric theory when he tried to measure
stellar parallax
aristarchus used geometrical arguments to state that
the sun was at center of universe
aristotle studied the curved shadow of the earth during a lunar eclpse and found that
earth must be a sphere
copernicus beleived in wat theory
copernicus
copernicus measured the
orbital speeds of the planets
copernicus measured what for the 1st time
stellar parallax
based on keplers 3rd law
planet with the shortest orbital period has the smallest semi-major axis
mass of earth 1st calculated by
cavendish
every action has an equal and opposite reaction
3rd law newton
galileos evidence in favor of the heliocentric theory was
the completely perfect surfaces of the moon and the sun
kepler studied tycho brahes observations of mars and found that
the planets move in ecliptic orbits wit the sun at one focus
the surface gravity or the acceleration due to gravity on the moon is
less than on earth so you would feel lighter on the moon
if earth shrank to a quarter of its current size gravitational force between sun and earth would
decrease by a factor of four so 4 squared = 16
if earth shrank to a quarter of its currrent size your weight would
increase by a factor of four so 16
copernicus measured the
orbital speeds of the planets
copernicus measured what for the 1st time
stellar parallax
based on keplers 3rd law
planet with the shortest orbital period has the smallest semi-major axis
mass of earth 1st calculated by
cavendish
every action has an equal and opposite reaction
3rd law newton
galileos evidence in favor of the heliocentric theory was
the completely perfect surfaces of the moon and the sun
kepler studied tycho brahes observations of mars and found that
the planets move in ecliptic orbits wit the sun at one focus
the surface gravity or the acceleration due to gravity on the moon is
less than on earth so you would feel lighter on the moon
if earth shrank to a quarter of its current size gravitational force between sun and earth would
decrease by a factor of four so 4 squared = 16
if earth shrank to a quarter of its currrent size your weight would
increase by a factor of four so 16
lunar eclipse- moon sun earth
Moon Earth Sun
lowest to highest - types of electromagnetic radiation in order of increasing energy
radio infrared visible ultravioelt xray gamaray
stars x and y have the same temperature but x has a sa that is 5 x that of y - how much more luminous is is star x than star y

( same question with radius )
5 times

25
a person is reading book while standing 3 ft away from a table that has a lb on it. if table moved to a distance of 6 ft. how many lbs wouldhave t o be placed on the table to light up book same amt.
4 bulbs
each element has a unique set of spectral lines bc
there is a unique set of electron orbits
Kirchoffs laws describe
how absorption emission and continuos spectrum are formed
dispersion grating to look at lightbulb
continuos spectrum
dispersion grating to look at hot low density gas
bright emission lines only
dispersion grating to look at a star
a continuos spectrum
a stars spectral lines would be blueshifted when
star is moving towards us
why are radio telescopes much larger than optical telescopes?
larger telescopes have better resolving power
a 10 m and a 1 m telescope differences?
wom b has larger surface area and apaerture and 00 times more light gathering power
herbig haro object and t tauri star
young stars
large size rapid rotation contain mostyle hydrogen and helium
jovianl planets
small size slow rotation rocky composition
terrestrial planets
fewer moons jovian or terrestrial
jovian
shortest to longest orbital period
mercury venus earth mars jupiter saturn uranus neptune
highest albedo planet
venus
in the greenhouse effect the ground radiates
infrared radiation
atmospheric extinction
has the largest effect when observing stars close to horizon and causes light passing throiugh an atmosphere to appear dimmer
p waves travel through
solis dand liqueids
you have 2 ball of eqwual size and smoothness one is heavy and ht eother one ismuch lighter -which hits 1st
hit at same time
if you ____________ you will weight twice as you do now
double earths mass
satellites in geosynchronous orbits take ________ hrs to orbit earth
24
escape velocity of a planet is the
velocity required to escape the the gravitational attraction of hte planet
Globular clusters are found
in the halo
what is found in hte disk of our gallery
earth and sun
young stars are found ______ from the instellar gas and dust
very close to
the spiral structure of our galaxy can be found from
the distribution of young stars
stars near the sun take about ____ yrs to complete 1 orbit of our galaxy
250 million
the shape of a galaxy rotation curve tells us that
there is a lot of dark matter ina galaxy that we cannot see
the local group is
the cluster of galaxies in which the milky way is located
most of hte galaxies in the universe are
elliptical galaxies
the hubble classification system is based on the
shapes of galaxies
elliptical galaxies contain only
old stars and almost no gas or dust
spiral galaxies contain both
youn and old stars and a lot of gas and dust
irrecgular galaxies contain both young and old stars and lots of
gas and dust
quasars are ____ to the milky way galaxy
far from
quasars have spectra with
high redshifts
quasars look faint but
have very high luminosities
the spectra of distant galaxies show a
large redshift
hubbles law sugguests the universe is
expanding
the hubble's law suggests that the
universe must hv started from a compact object
we know that hte universe started as a small object because it is now
expanding
the remnant of the big bang explosion has a wavelength in the
microwave part of electromagnetic spectrum
the remnant of the big bang explosion is called the
cosmic background radiation
the anisotropy of hte backround radiation_____ same tempereature as background radiation
does not have
cosmological principle states that on a large scale the universe is
isoptropic and homogenous
measurements of the density of matter in the universe suggest that hte universe is
flat and accelerating
baryonic matter makes up only
4 percent of universe