Astronomy Test 3
Order by
64 terms
Terms | Definitions |
|---|---|
 Asteroid | Mars and Jupiter- Belt- Rocks |
| Trojan | Jupiters family of asteroids |
| Earth Crossers | Apollo class can hit NEO- Near earth objects |
| Oort's Cloud | spherical cloud surrounding solar system 50000 AU |
| Kuiper's Belt | Outside Neptune- leftover planetismals |
| Meteroid | Small piece in space |
| Meteor | burning up in out atemosphere |
| Meteroite | Rock on the ground |
| Photosphere | part of the sun we see about 500 miles thick - 5800K |
| Chromo sphere | pink-- 10000 miles above photosphere- 15000K |
| Corona and Holes | outer atm and 1,000,000K+-- areas which have no corona are called holes |
| Luminosity | how much energy sun gives off - we use sun as standard unit of 1 solar lum |
| Convection Zone | area just below surface that energy moves and undulates sun surface |
| Radiation Zone | area around core of sun that moves the energy |
| Core | 15,000,000K dense and all fusion takes place here |
| Helio Seismology | study of convection undulations below surface |
| Granualtion | salt and pepper texture on surface due to convection |
| Sunspots | Magnetic storms cooler by 2000K on suns surface |
| Cycle | 11 years if you look at numbers and 22 years if you look at total polarity switch |
| Prominences | loops of gasses that connect paired sunspots |
| Flares | hot storms that last 5 to 20 minutes 5 million degrees sends out a lot of x rays and solar radiation |
| Fusion | combining hydrogen into helium which releases energy only in core |
| p-p reaction | reaction that takes place in suns core- 4 hydrogen to 1 helium |
| E=mc2 | E= enegry m= mass c= speed of light |
| Neutrinos | essentially mass less particles that are created at sunds core and may let us study the core |
| Parsec | parallax of one arc sec- 3.26 light years |
| Proper Motion | amouth stars moves across the sky- most are to far away to see proper motion |
| Apparent Brightness | Brightness of star in night sky |
| Magnitude Scale | each magnitude number changes by 2.5 times up of down |
| Absolute Mag | How bright star would appear at 10 parsecs |
| Mass-Luminosity | the more massive the star the brighter it is |
| Radius-luminosity-temperature relationship | to truly know the brightness of star you need to know size and temp |
| Visual Binaries | can see the two stars and used to get masses |
| Spectroscopic Binaries | cannot see the companions but spectrum tells them they are there |
| Spectroscopic Parallax | uses HR diagram to measure distance to stars |
| Eclipsing Binaries | two stars the block each others light-- east to measure masses of stars |
| Main sequence turnoff point | star leaves main sequence as it gets old |
| Molecular Clouds | large cool gas cloud that have many material and dust- star formation |
| Protostar | forming star |
| Jets | gasses ejected as star forms |
| Thermal vs Degenerate Pressure | thermal- out degenerate- stops collapse inward |
| Brown Dwarfs | failed stars |
| Hydrogen Shell Burning | olders stars having fusion moved out from core |
| Helium fusion-flash | star trying new fuel in flash |
| White dwarf and planetary nebula | sun dies are core called white dwarf surrounded by planetary nebula |
| CNO cycle | more massive stars than sun use this |
| Iron Stage | last fuel most massive stars can use |
| Supernova | huge explosion - type 1 binary star dearth type II one large star explosion |
| Neutron Star | 1.4 to 6 solar mass-- 10 mile collapsed core of neutrons |
| Electron Degeneracy | That which stops white dwarf from collapsing any further |
| White Dwarf | .1 to 1.4 sollar masses - sun ends up this 10000 miles across- earth size |
| White dwarf limit | .1 to 1.4 |
| Accretion Disk | material falling in 10 percent energy production |
| Nova | Binary star explosion- periodic |
| White Dwarf Supernova | binary stars collaps on each other - type 1 |
| Massive star Supernova explosion | type II one large star explosion |
| Neutron Stars | 1.4 to 6 solar masses-- 10 mile collapsed core of neutrons |
| Neutron Degeneracy | stops further collapse |
| Pulsars | rotating neutron star |
| Black Hole | light cannon escape- 6 solar masses and above |
| Schwarz Child Radius | the size of a black holes event horizon |
| Event Horizon | once you cross you cannot return |
| Signularity | mass but no size |
| Gamma Ray Bursts | matter falling into black holes giving large explosions to gammas |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.