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90 Cards in this Set
- Front
- Back
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the annual or yearly motion of the earth occurs because of the
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real orbital motion of the earth and the sun
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which object is at the center of the celestial sphere
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earth
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a parsec is a unit of
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distance
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the South Celestial Pole
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the projection of the earths south pole on the the celestial sphere
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the celestial equator is the
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projection of the earths equator onto the celestial sphere
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the obliquity of the ecliptic is the same as the tilt of the ____ axis of rotation
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earths
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the obliquity of the ecliptic is the
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angle between the celestial equator and the ecliptic
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degree of th obliquity of the ecliptic
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23.5 degrees
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for an observer at the earth's north pole, all stars above the horizon
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are circumpolar
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the observer's meridian is a semi-circle through the
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NCP, SCP zenith and np of hte horizon
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the observers meridian is a semi-circle through the
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ncp scp zenith and south point on thehorizon
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declination of a star is the equivalent to
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latitude on the celestial sphere
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the precession of the earth takes
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26000 years
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nutation vs precession
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precession has a bigger effect
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sideral orbit of hte moon is
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its orbital period with respect to the stars
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the apparent shifting of the position of mars bc of earths orbital motion is called
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retrograde motion
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hipparcus wanted to prove the heliocentric theory when he tried to measure
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stellar parallax
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aristarchus used geometrical arguments to state that
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the sun was at center of universe
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aristotle studied the curved shadow of the earth during a lunar eclpse and found that
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earth must be a sphere
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copernicus beleived in wat theory
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copernicus
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copernicus measured the
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orbital speeds of the planets
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copernicus measured what for the 1st time
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stellar parallax
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based on keplers 3rd law
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planet with the shortest orbital period has the smallest semi-major axis
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mass of earth 1st calculated by
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cavendish
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every action has an equal and opposite reaction
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3rd law newton
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galileos evidence in favor of the heliocentric theory was
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the completely perfect surfaces of the moon and the sun
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kepler studied tycho brahes observations of mars and found that
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the planets move in ecliptic orbits wit the sun at one focus
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the surface gravity or the acceleration due to gravity on the moon is
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less than on earth so you would feel lighter on the moon
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if earth shrank to a quarter of its current size gravitational force between sun and earth would
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decrease by a factor of four so 4 squared = 16
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if earth shrank to a quarter of its currrent size your weight would
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increase by a factor of four so 16
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copernicus measured the
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orbital speeds of the planets
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copernicus measured what for the 1st time
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stellar parallax
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based on keplers 3rd law
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planet with the shortest orbital period has the smallest semi-major axis
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mass of earth 1st calculated by
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cavendish
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every action has an equal and opposite reaction
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3rd law newton
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galileos evidence in favor of the heliocentric theory was
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the completely perfect surfaces of the moon and the sun
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kepler studied tycho brahes observations of mars and found that
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the planets move in ecliptic orbits wit the sun at one focus
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the surface gravity or the acceleration due to gravity on the moon is
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less than on earth so you would feel lighter on the moon
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if earth shrank to a quarter of its current size gravitational force between sun and earth would
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decrease by a factor of four so 4 squared = 16
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if earth shrank to a quarter of its currrent size your weight would
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increase by a factor of four so 16
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lunar eclipse- moon sun earth
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Moon Earth Sun
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lowest to highest - types of electromagnetic radiation in order of increasing energy
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radio infrared visible ultravioelt xray gamaray
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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
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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.
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4 bulbs
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each element has a unique set of spectral lines bc
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there is a unique set of electron orbits
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Kirchoffs laws describe
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how absorption emission and continuos spectrum are formed
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dispersion grating to look at lightbulb
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continuos spectrum
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dispersion grating to look at hot low density gas
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bright emission lines only
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dispersion grating to look at a star
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a continuos spectrum
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a stars spectral lines would be blueshifted when
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star is moving towards us
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why are radio telescopes much larger than optical telescopes?
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larger telescopes have better resolving power
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a 10 m and a 1 m telescope differences?
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wom b has larger surface area and apaerture and 00 times more light gathering power
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herbig haro object and t tauri star
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young stars
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large size rapid rotation contain mostyle hydrogen and helium
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jovianl planets
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small size slow rotation rocky composition
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terrestrial planets
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fewer moons jovian or terrestrial
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jovian
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shortest to longest orbital period
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mercury venus earth mars jupiter saturn uranus neptune
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highest albedo planet
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venus
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in the greenhouse effect the ground radiates
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infrared radiation
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atmospheric extinction
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has the largest effect when observing stars close to horizon and causes light passing throiugh an atmosphere to appear dimmer
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p waves travel through
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solis dand liqueids
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you have 2 ball of eqwual size and smoothness one is heavy and ht eother one ismuch lighter -which hits 1st
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hit at same time
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if you ____________ you will weight twice as you do now
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double earths mass
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satellites in geosynchronous orbits take ________ hrs to orbit earth
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24
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escape velocity of a planet is the
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velocity required to escape the the gravitational attraction of hte planet
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Globular clusters are found
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in the halo
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what is found in hte disk of our gallery
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earth and sun
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young stars are found ______ from the instellar gas and dust
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very close to
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the spiral structure of our galaxy can be found from
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the distribution of young stars
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stars near the sun take about ____ yrs to complete 1 orbit of our galaxy
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250 million
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the shape of a galaxy rotation curve tells us that
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there is a lot of dark matter ina galaxy that we cannot see
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the local group is
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the cluster of galaxies in which the milky way is located
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most of hte galaxies in the universe are
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elliptical galaxies
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the hubble classification system is based on the
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shapes of galaxies
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elliptical galaxies contain only
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old stars and almost no gas or dust
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spiral galaxies contain both
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youn and old stars and a lot of gas and dust
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irrecgular galaxies contain both young and old stars and lots of
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gas and dust
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quasars are ____ to the milky way galaxy
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far from
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quasars have spectra with
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high redshifts
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quasars look faint but
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have very high luminosities
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the spectra of distant galaxies show a
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large redshift
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hubbles law sugguests the universe is
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expanding
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the hubble's law suggests that the
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universe must hv started from a compact object
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we know that hte universe started as a small object because it is now
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expanding
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the remnant of the big bang explosion has a wavelength in the
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microwave part of electromagnetic spectrum
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the remnant of the big bang explosion is called the
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cosmic background radiation
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the anisotropy of hte backround radiation_____ same tempereature as background radiation
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does not have
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cosmological principle states that on a large scale the universe is
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isoptropic and homogenous
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measurements of the density of matter in the universe suggest that hte universe is
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flat and accelerating
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baryonic matter makes up only
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4 percent of universe
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