Card Set Information
Astronomy 101 Test 1
-Organize ideas/ theory
-Predictions & testing
Powers of 10?
10^3 = 1000
10^2 = 100
10^1 = 10
10^0 = 1
sphere surrounding earth, which all objects in sky were considered attached to.
path of sun
, relative to stars on celestial sphere,over course of yr.
Responsible for seasons?
1)Summer Solstice? 2)Winter Solstice?
1)Verrnal equinox? 2)Autumal equinox?
change in avg temp & length of day due to tilt of earth's axis respect to plane of its orbit.
1)Pt on ecliptic where sun is at
celestial equator(near June21)
2)Pt on ecliptic where sun is at
celestial eq. (near Dec 21)
1) Date when sun
celestial eq. moving
(near march 21)
2) Date when sun
celestial eq. moving
(near sept 22)
of a spinning object cause by external gravitational influence.
Appearance of sunlit face of moon at different pts along orbit(seen fr. earth).
Phase, none of lunar disk is visible.
Phase,moon appears half disk.
Phase,appears complete circular disk in sky.
Event during which one body passes in
front of another
, so light
Celestial event which
moon passes through shadow of earth
(temporary darken surface)
only part of covered body is blocked
Celestial event which o
ne body is completely blocked
from view by another.
Measurement of distance. Trangulation?
One distance measurement method.
of relatively close object w/ respect to a more distance background as the location of the obserber changes.(shift of object from different line of site)
Backward, westward loop traced out by a planet w/ respect to fixed stars.
: model of solar system that holds
earth is at enter
of universe & all bodies orbit around it.(Aristotle)
Heliocentric:model of solar system that is
centered on Sun
, while earth in motion about sun.(Copernicus)
Kepler's First Law
The orbital paths of planets are elliptical with sun at one focus.
Distance from focus to ellipse to other focus stay same.
Kepler's Second Law
Imaginary line connecting the Sun to any planet sweeps out equal areas of ellipse in equal intervals of time.
Swing out equal areas in equal time when close/far to sun.
Kepler's Third Law and
The square of a planet's orbital period is proportional to the cube of its semi major axis.
P2(yr)= a3(AU)/ M(M0)
Average distance btw earth and sun.
Newtons Law One and Two
1)An object at rest remain at rest, moving object continues straight line at constant speed, unless external force changes their state of motion. ( See Pic)
2) The Acceleration(change of speed) of object is directly proportional to the net applied force and inversely proportional to the objects mass.
Newtons Third Law and
To every action(force) there is an equal and opposite reaction.
Force= GM1*M2/r2 (product masses/ distance)
Light described as wave.
Number of meters needed for wave to repeat itself at given moment in time.
Union of electricity and magnetism, which don't exist as independent qualities but in reality are two aspects of single physical phenomenon.
Radio, inferred, visible ultraviolet, x-ray, gamma-ray
Radio(AM FM) Inferred (far near) Visible(micron oms) Ultraviolet (near far) x-ray (soft hard)
Number of crest going by in hertz
and Stefan's Law.
Wavelength(max) = 0.29 cm/ T (temp)
F= o T^4
spectra in which radiation is distributed over all freqs (EX
: blackbody radiation emitted by hot, dense body)
bright line in specific location of spectrum of radiating material, corresponding to emission o flight at certain freq. (EX
: heated gas in glass container)
Dark line in an otherwise continuous bright spectrum, where light within one narrow freq range has been removed. (missing lines is emission lines)
Formation of Spectral Lines
-Compostion ( what is there)
-Abundances ( how much is there)
-temp ( wiens law, black body,/other)
-pressure ( Broadens lines)
- Rotation ( doppler effect)
-magnetic field( zeeman effect)
-electric field( stark effect)
(motion towards/ away from obserber)(pitch high toward, low going away)
Visible light telescope, curved
to gather& focus light from distance object.
Telescope that uses a
to gather 7 focus light from distance object.( small ie binoculars) ( no modern research use this )
side eye view mirror
see through lens
solid glass w. chemical reaction on surface to make permanent record of observation.
improved by using larger telescopes and shorter wavelengths.
smeared out image of a star in long duration exposure
lights at different telescopes and slight different times
sensitive to longer wavelength radiation, absorbed by atmosphere, not reflect on mirror, SEE THROUGH DUST.
X ray telescope
High energy telescope b/c reflected easily by any kind of surface.