Quizlet

Science 9 ACS Astronomy Unit Test

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About this set

Created by:

cthiessen  on October 27, 2010

Subjects:

science

Description:

Mrs. Van Dop's Science 9 Class

Classes:

The Will of William Shakespeare, follow our God it will help, Science/ Math, science

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mynameisdannywhatsyours : derppaderpherrpanuurplepurple
Johnnyhippo : haaaaaaaaaaaaaa
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puddingbear : WILL you go out with me
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puddingbear : i need a answer
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jemjem787 : getting on what
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puddingbear : give me a hi five
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puddingbear : o
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puddingbear : whos hater
mynameisdannywhatsyours : my name is danny whats yours
johnnyhipposfriend : ijhjk
puddingbear : pudding
jemjem787 : PUDDING
mynameisdannywhatsyours : hi pudding bear :)
jemjem787 : :P
Johnnyhippo : :D :D
jemjem787 : :O
jemjem787 : :) :)
puddingbear : hello
johnnyhipposfriend : :p :p
jemjem787 : :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) vv
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johnnyhipposfriend : :) : ) :D :D :p :p
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jemjem787 : whos godsgirl
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smiley777 : hi
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PVANDOP1 : detention for all of u!@!
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PVANDOP1 : ^@#%@#&@&#*(@&#*(@
PVANDOP1 : HAHA JULIA
PVANDOP1 : DETENTION
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johnnyhipposfriend : Im scared
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godsgirl101 : somehow thinking PVANDOP1 isn't mrs.vandop....
smiley777 : no it's not
johnnyhipposfriend : hello?
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johnnyhipposfriend : harro?
kbrooke58 : hello?

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Science 9 ACS Astronomy Unit Test

astronomy
is the science that studies the composition, position, and movements of all objects in space.
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astronomy is the science that studies the composition, position, and movements of all objects in space.
Astronomer a scientist who studies astronomy
constellations a pattern of stars arranged as a mythical figure or animal
asterism are parts of constellations. The big dipper is part of the constellation ursa major
circumpolar constellation three constellations that always appear in our night sky: Dig Dipper, Little Dipper and Casseopia.
Copernicus He suggested the sun is the center of our solar system
rotation the spinning of an object around an imaginary axis.
photoperiod the number of hours of daylight
galileo He constructed accurate telescopes and discovered moons and rings around planets.
aphelion when the earth is farthest away from the sun
(July 4)
kepler he created the laws of planetary motion
perihelion when the earth is closest to the sun (Jan 3)
precession the change in direction of the Earth's axis
equinox when the sun is above and below the horizon an equal amount of time
corona the part of the sun that is visible during a complete solar ecllopse. The outer atmosphere of the sun.
geocentric the view that the earth is the center of the universe
solar eclipse the type of eclipse that occurs when it is sun, moon, earth
spring tide very strong tides, very high and very low, when the sun,earth and moon are lined up
solstice when the sun is at the highest and lowest positions in the sky
winter solstice the day with the least hours of sunlight
summer solstice the day with the most hours of sunlight
revolution the motion of an object around another object (a year)
retrograde motion the apparent slowing, reversal and looping of a planet in its path across the sky
lunar eclipse Eclipse when it is sun, earth, moon
heliocentric the view that the sun is the center of the solar system
seasons Caused by the tilt of the earth's axis
tides caused by the gravitational pull between the earth and the moon and the sun.
neap tides weak tides, when the sun and moon are perpendicular to each other with respect to the sun.
outer planet one of the four planets furthest from the sun, the gas giants, Jupiter, Saturn, Uranus and Neptune
gas giant most of the planet is made up of gasses. Another name for the outer planets: Jupiter, Saturn, Uranus and Neptune.
Inner planet The planets closest to the sun; Mercury, Venus, Earth, and Mars. They are also known as the terrestrial planets.
Terrestrial planet one of the dense rocky planets nearest to the sun: Mercury, Venus, Earth, and Mars.
Asteroid any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)and are too small to be called planets
meteorite large meteors that reach the earth's surface and hit the surface
meteor A STREAK OF LIGHT in the sky produced by the burning of a meteoroid in Earth's atmosphere, a falling star. It doesn't hit the ground.
comet frozen chunks of rocks and metalllic particles that orbit the sun in long elliptical paths
Big splash theory The current theory that explains the formation of the moon; it states that, approximately 4.5 billion years ago, the moon was formed as a result of an object colliding with earth, causing less dense portions to be blasted into space.
rotating nebula theoryTheory of the formation of solar system. It started as a nebula which collapses and then then sun forms. The remaining particles rotate around the sun and clump forming protoplanets and then terrestrial planets. When the sun powered up it blasted the gases out further which ended up forming the gas giants.
Hubble He discovered the existence of other galaxies and determined that galaxies are moving away from us
red shift a shift of the spectral lines to longer wavelengths. The greater the shift, the faster the galaxy is moving away from us
spectrum a range of wavelengths, evident by bands of light, seen through a spectroscope. Each chemical element has its own spectrum. (color bands)
spectroscope an instrument that splits and spreads out light into a spectrum.
big bang theory the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions
light year the distance light travels in one year
parallax an apparent shift in the position of a star against the background of more distant non-moving stars.
triangulation a method of determining the distance to a point using two angles and a baseline of known distance.
baseline the measurement between two fixed points, used in triangulation. Used to measure the distance of stars. The longest baseline used is the diameter of the earth's orbit.
nuclear fusion hydrogen nuclei fuse to form helium nuclei.The reaction releases an enormous amount of energy
cepheid variable stars are unstable big stars that are 1000x brighter than the sun and the pulse, they have predictable brightness and behavior, brighter=closer, dimmer=further, they are found in most galaxies and are used to determine distance
absolute magnitude Amount of light a star actually gives off.
apparent magnitude How bright a star appears to be.
photosphere The surface of the sun.
Ptolemy He stated that the earth is the centre of the universe
Escape Velocity The speed needed for a rocket to escape the pull of the Earth's gravity
Geosynchronous Orbit The orbit of a satellite when it stays in the same position above the Earth.
chromosphere a gaseous layer of the sun's inner atmosphere
corona the Sun's outer atmosphere, consisting of thin , hot gases
sunspots dark spots on the Sun's surface, varying in size and regularity, caused by disturbances in the Sun's magnetic field. These are the origin of solar flares/prominences.
solar prominences huge, arching line of gas, released from the photosphere. They last several weeks.
solar flares brief expulsion of large quantities of gas and charged particles originating from sunspots.
solar wind an ionized gas emitted from the Sun from solar flares and prominences. This gas enters our atmosphere and causes the northern lights.
main sequence the area on the Hertzsprung-Russel diagram where the majority of stars are found
elliptical galaxy An oval shaped galaxy that is very old, and has very little dust and gas.
spiral galaxy a galaxy shaped like a pinwheel. Our Milky Way galaxy is an example of this type of galaxy.
Barred spiral galaxy A galaxy that is similar to a spiral galaxy, except that the spiral arm pattern originates from a bar of material that passes through the nucleus of the galaxy.
irregular galaxy a galaxy that does not have a regular shape
quasar a star-like object that may send out radio waves and other forms of energy
Globular cluster a large, round, densely-packed grouping of thousands to millions of older stars
open cluster a star cluster that has a loose, disorganized appearance and contains no more than a few hundred, typically young, stars.
reflecting telescope optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece -Isaac Newton
electromagnetic radiation a form of energy that exhibits wavelike behavior as it travels through space
refracting telescope optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece-Galileo
space probe a spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew
local group a group of about 30 galaxies that includes the Milky Way
solar mass a unit of measure equal to the mass of the sun
nebula the beginnings of the formation of a star
nebula a collection of dust and gases, consisting mainly of hydrogen and helium
red giant A star that expands and cools once it runs out of hydrogen fuel
white dwarf a dim star that forms from a collapsed red giant
black dwarf a white dwarf whose light has gone out, and is no longer visible
supernova the brilliant explosion of a dying supergiant star
neutron star/pulsar the end stage of a high mass star life cycle . It is a star that emits light and a beam of very high energy radio waves
black hole Remnant of a very high mass star that is so dense that nothing, not even light, can escape its gravity field.
red supergiant The star formed when a high and very high mass star runs out of fuel and expands.

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