| front |
back |
revisions |
lasted changed by |
history |
| neutrino |
can go thru 3 or 4 light years of solid lead w/ out being stopped, only way of confirming what goes on in the heart of the sun |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
 |
| position |
anti-matter equivalent of a proton |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| low fusion |
proton-proton chain |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| high fusion |
CNO cycle |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| corona's arms |
prominances, huge arcs of glowing gas that jut out from the corona |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| solar eclipse |
suns disc is blocked out by the moon and the only thing you can see is the corona |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| temperature |
energy of kinetic motion, how fast particles move |
0 |
maddyc Mon, 05 May 2008 02:55:07 GMT |
|
| solar flares |
suns brief but violent interuptions, sun puts out as much energy in a couple minutes that it does in months |
0 |
maddyc Mon, 05 May 2008 02:55:06 GMT |
|
| conduction |
transport by random molecular motion |
0 |
maddyc Mon, 05 May 2008 02:36:51 GMT |
|
| radiation |
transport by fluctuating electrical and magnetic fields |
0 |
maddyc Mon, 05 May 2008 02:36:51 GMT |
|
| convention zone |
atoms combine and form a gas, opaque to radiation |
0 |
maddyc Mon, 05 May 2008 02:36:51 GMT |
|
| core |
where most of the energy is produced, contains a plasma- ionized gas |
0 |
maddyc Mon, 05 May 2008 02:36:51 GMT |
|
| fusion |
process by which the sun produces energy, lighter nuclei combine to form heavier elements, in the process energy is released according to ensteins theory |
0 |
maddyc Mon, 05 May 2008 02:36:50 GMT |
|
| blackhole |
region where escape velocity is greater than the speed of light so nothing can escape |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| 2 kinds of stellar remnants- |
white dwarf (what sun will form)
neutron star- can become pulsar or black hole |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| 3 forces |
gravity, weak force, electromagnetc |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| what does light from stars tell us |
distance
composition
temperature
speed |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| radio waves include |
AM, FM, TV, microwaves |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| longer wave lengths = |
less energy per unit |
0 |
maddyc Sun, 04 May 2008 22:30:01 GMT |
|
| whats the difference between radio and gamma waves? |
different frequencies |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| electromagnetic radiation |
energy trasported by fluctuating electro and magnetic fields |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| defer |
in addition to epicycles the main path of earth |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| cosmic microwave background |
when bb occured there was radiation left over, background noise at certain level |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| repulsive force is caused by |
dark energy |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| perameter used to catogorize shape |
omega |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| the universe is cooling/heating while is is expanding |
cooling |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| galileo |
first person to use a telescope to examine heavens |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| eliptical planet exceptions |
mars and mercury |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| keplers law |
planets move in elliptical orbits with the sun at one focus |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| epicycles |
small circles that planets make while going around the earth |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| tycho brahe |
experimentist, didnt like math so hired kepler |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| copernicus |
revived aristarchus' helioventruc theory |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| gregorian calender |
centuries not divisble by 400 cant be leap years |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| summer solstic |
-sun is at the northern most point of the ecliptic
-on or near june 21st
-signals the beginning of summer in the northern hemisphere
-largest # of daylight hours |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| ecliptic |
suns path across the celestial sphere |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| altitude |
above horizon |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| azimuth |
below horizon |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| aphelion |
planets farthest distance from the sun |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| perihelion |
closest distance to the sun |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| declination |
lines that run parallel to the celestial equation |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| right ascension |
lines that run north-south and divide the celestial sphere in 24 equal divisions |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| parrallex |
shift in an objects position due to the obervers motion |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| aristarchus |
heliocentric universe |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| geocentric universe |
aristotle |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
measurements:
terrestrial
in solar system
outside solar system |
km
Au
light year |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| quasar |
very energy dense, 100 to 1000 times the energy of a typical galaxy |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| pulsar |
rapidly rotating neutron star whose magnetic field interacts with surrounding gas and beans of radiation at the pulse |
0 |
maddyc Sun, 04 May 2008 22:22:04 GMT |
|
| low mass star stages: |
nebulae, main sequence, red giant stage, yellow giant, red super giant |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| shellburning |
outter layers fuse hydrogen |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| hihg mass stars leave behind a _____ or _____ |
pulsar or black hole |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| low mass stars leave behind a remnant called a |
white dwarf |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| stars produce energy by the fusion of ____ and ________ |
hydrogen and helium |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| hydrostatic equilibrium |
balance between gravity and the pressure of the hot gases in the stars core |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| nebulae |
vast clouds of gas and dust, star forms from them |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| light tells us |
1. composition
2. speed
3. temperature |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| red is ______ than blue wavelength |
longer |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| planetesmals |
pre-planets |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| emission line spectrum |
tenuous gas |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| continuous spectrum |
hot dense object |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| wiens law |
the hotter a body is the more strongly it raciated at higher frequencies |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
blue= _______ the observer
red = _______ the observer |
towards
away |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| what can light from a star tell us? |
1. what an object is made of
2. speed
3. temperature |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| electromagnetic spectrum |
radio
infared
visible
ultravilolet
x rays
gamma rays
<---------------------------wavelength
---------------------------> energetic
---------------------------> frequency |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| How do astronomers learn about the universe? |
1. light
2. forces |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| plasma |
ionized gas (gas where electrons have been stripped away) |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| cosmic microwave background |
left over stuff from the big bang theory |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| inflation explains |
explains casuality problem and flatness problem (if you draw a small portion of a shere its going to look flat) |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| 2 parts of big band |
inflation and cosmic microwave background |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| finite speed of light |
limitation to how fast things can travel |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
omega > 1 =
omega = 1 =
omega < 1 = |
round
flat
saddle shape |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| flatness problem |
because the universe is so big, its going to look flat to us |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| einstein's theory of relativity |
all mass is going to make things come togehter |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| isotropic |
looks the same from any direction that you looks at it |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| cosmological princliple |
the inoverse is both homogenous and isotropic |
0 |
maddyc Sun, 04 May 2008 21:59:23 GMT |
|
| dark energy makes up _____% of the universe, 5% is_______ and _______, 25% is missing or_____ |
70, baryonic matter and energy, dark mass |
0 |
maddyc Sun, 04 May 2008 21:59:22 GMT |
|
| ecliptic |
the sun's path across the celestial sphere |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| the difference in the length of the sidereal and tropical years arises from |
the earth's precession |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| solar day |
24 hr period of earth's axial rotation that brings the sun back to the same local meridean, sun reaches highest pt. |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| sidereal day |
amount of time of succesive horizons of a given star |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| t or f: the celestial north pole lies directly above the earth's north pole |
t |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| constelations |
star patters on the celestial sphere |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| perhelion |
the earth is closer to the sun during winter in the northern hemisphere |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| right ascension and declination |
celestial coordinates used to describe the positions of heavenly bodies |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| perhilionhelium flash |
the runaway explosive burning of helium in the degenerate helium core of a red giaant |
0 |
maddyc Sun, 04 May 2008 21:08:36 GMT |
|
| red giant |
a low mass star characterized by a contracting energy depleted helium core surrounded by a volumous hydrogen burning shell |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| what evidence leads astronomers to believe that they have detected black holes |
they have seen x- rays, perhaps from gas around a black hole, suddenly disappear as a companion star eclipses the hole |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| evolutionary path of a low mass star |
nebula, protostar, main sequence, red giant, yellow giant, red supergiant, white dwarf/ planetary nebula |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| schwarzchild radius |
something is so small it becomes a black hole |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| event horizon |
the escape velocity is greather than the speed of light |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| planetary nebula |
is a shell of gas ejected by a low mass star at the end of its evolutionary lifetime |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| high mass stars evolve similarily to low mass stars through the red supergiant stage. However these stars are massive snough to continue to fuse heavier and heavier elements creating a layered strucutre. This continues until a core of _______ nuclei is produced. |
iron |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| as a star like the sun evolves into a red giant, its core |
contracts and heats |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| a high mass star is at least ____ times as massive as the sun |
8 |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| when our sun expires five billion years ago it will leave behind a remnant known as |
white dwarf |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| what keeps a star from collapsing under its own gravity |
the outward force exerted by the pressure of the gas in its hot interior |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| quasars are thought to be |
galaxies in formation |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| quasars |
compact sources which have hundred to thousands of times the energy output of an entire galaxy |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| a pulsar does not |
undergo nuclear fusuion |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| no force in the universe can counteract the gravity of a black hole so its core must continue to collapse towards 0 radious and infinite density forming a |
singularity |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| electromagnetic force |
binds the protons (and neutrons) togehter to form the nuclei of atoms despite their tendency to repel each other |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| solar system |
is a star or closely spaced group of stars and their satellites |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| what is the shape of the milky wat galaxy and where in it is the sun located? |
it is barred spiral, the sun is close to the inner rim of the galxies orion arm |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| which of the following structures spans about 100,000 light years? |
galaxies |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
which is not a stellar remnant:
black holes, white dwarfs, neutron stars, quasars, pulsars |
quassars |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| galaxies are not spread smoothly over the sky but rather are clumped into loose groups known as clusters that |
are seperating from one another at high velocities |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| distance to various objects in our solar system are typically measured by |
astronomical units |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| a light year measures |
distance |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| order of the solar system |
earth, solar system, milky way, local group |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| an astronomer located a celestial object whose spectrum is blue shifted to a great extent. he or she concludes that |
the object is moving away from the earth at a high speed |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| red light has a wavelength about 700nm whereas blue light has a wavelength of about 400. from this we can conclude that |
blue light is of a higher frequency than red light |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| why do all macroscopic objects emit electromagnetic radiation? |
the atoms of which they are made contain charged particles that are in constant varying motion |
0 |
maddyc Sun, 04 May 2008 21:02:02 GMT |
|
| Spectroscope |
an instrument used to analyze electromagnetic radiation |
0 |
maddyc Sun, 04 May 2008 21:02:01 GMT |
|
| Our sun has a surface temperature of 5800K and radiated most intensely in the yellow light region of the electromagnetic spectrum. Stars thirty times as massive as the sun have surface temperatures exceeding 30,000K. one would expect them to: |
emit more strongly in the ultraviolet region |
0 |
maddyc Sun, 04 May 2008 20:39:46 GMT |
|
which kind of photon carries the least amount of energy?
xray, infared, visible, ultraviolet, microwave |
microwave |
0 |
maddyc Sun, 04 May 2008 20:39:46 GMT |
|
which of the following is not part of the electromagnetic spectrum?
x rays, ultrasonic rays, radio waves, ultraviolet radiation, visible light |
ultrasonic waves |
0 |
maddyc Sun, 04 May 2008 20:39:46 GMT |
|
Which of the following does not travel at the speed of light?
visible light, ultraviolet radiation, radio waves, x rays |
none of the above |
0 |
maddyc Sun, 04 May 2008 20:39:46 GMT |
|
which of the following has the longest wavelength:
red light, blue light, ultraviolet radiation, radio waves, or xrays |
radio waves |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| An essential part of the big bang theory that explains how all parts of the universe were once in contact and able to interact long enough to become homogenous is |
inflation |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| Hubble's Law |
a relationship between a galaxy's distance and its recession velocity. It is based on the analysis of light from other galaies and indicated that more distant galaxies recede faster then nearby ones regardless of one's position in the universe. That is, the universe has no preferred position or center. |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| What represents the universe is closed? |
(omega)>1 |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| Dark energy |
an unknown form of energy that manifests itslef as a repulsive force accelerating the expansion of the universe. It is thought to be a reidual energy associated with space itself. Einstein referred to it in his theory of relativity as the cosmological constant |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| The shape of the universe is |
unknown |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| The casuality problem |
the universe is too big for all parts to interact with each other and create the large-scale uniformity observed |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| The universe seems to be heating up as it expands |
false |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| The universe consists primarily of |
dark energy |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| The universe is (expanding/contracting) at a (excelerating/ decelerating/ steady/ unknown rate) |
expanding and accelerating |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| how far away does the cosmic horizon lie from the edge of the universe? |
13.7 billion light years away, we'll never be able to catch up because it is expanding |
0 |
maddyc Sun, 04 May 2008 20:35:43 GMT |
|
| cosmic horizon |
apparent edge of observable universe visible in all directions |
0 |
maddyc Sun, 04 May 2008 20:35:42 GMT |
|
which of the following are made up of baryonic matter:
the sun, earth, living tissue, water, x rays, and planetesimals |
sun, earth, living tissue, water, and planetesimals |
0 |
maddyc Sun, 04 May 2008 20:26:11 GMT |
|
which of the following are forms of electromagnetic radiation:
dark matter, baryons, radio waves, hydrogen atoms, gamma rays, and light |
radio waves, gamma rays, and light |
0 |
maddyc Sun, 04 May 2008 20:26:11 GMT |
|
| If we randomly selected 5 large regions of space and compared them we would find that |
they were homogenous |
0 |
maddyc Sun, 04 May 2008 20:26:11 GMT |
|
| our universe has been rapidly expanding since the time of the big bang occurred about ______ years ago |
13.7 billion |
0 |
maddyc Sun, 04 May 2008 20:26:10 GMT |
|
