The unknown one
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| show | God made the light waves closer to us than the astronomical object
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| Name some problems with the in transit theory | show 🗑
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| show | CDK
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| show | the speed of light was much greater in the past
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| show | Early data has large error bars - people would look for data to match a prediction - changing speed of light changes the nature of space
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| The heating theory says | show 🗑
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| Name some problems with the heating theory | show 🗑
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| show | Matter we can interact with
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| show | 4
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| show | Carmelian
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| show | Neutonian
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| The orbit of _____________ was an issue for astronomers. | show 🗑
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| ___________ physics does not need to invoke ________ | show 🗑
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| In 1996, ________ predicted accelerating universe | show 🗑
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| show | Parallax
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| show | Parsec
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| show | the distance at which 1 AU suptends an angle of 1 arc second
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| show | subtending
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| 1/parsecs | show 🗑
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| as stars get closer, the parallax angle gets | show 🗑
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| a ____________ arcsecond is 1/3600 of a degree | show 🗑
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| there are ____ lightyears per parsec | show 🗑
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| the nearest star to the sun is | show 🗑
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| The two components of star movement are | show 🗑
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| show | radial motion
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| Proper motion is used to measure the | show 🗑
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| show | Bernard's star
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| The measure of the total power radiated by a star | show 🗑
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| show | distance
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| show | luminosity/distance^2
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| show | magnitude
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| show | larger
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| __________ is a star large enough for us to image directly | show 🗑
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| For stars that cannot be imaged directly, size must be calculated from | show 🗑
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| Luminosity is proportiional to | show 🗑
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| The radiation from stars is | show 🗑
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| show | OBAFGKM
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| Finding the stars spectral type reveals its | show 🗑
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| stars with low temperatures and high luminosity are | show 🗑
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| high temperature and low luminosity | show 🗑
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| show | Hydrogen into helium
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| show | hot (blue)
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| show | cooler (yellow or red)
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| Nuclear fusion requires that ____________________ get close enough to each other to fuse | show 🗑
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| Nuclear fusion can only happen if the temperature is | show 🗑
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| The process that powers most stars is | show 🗑
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| show | larger
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| show | higher
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| show | luminosity
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| show | Spectroscopic parallax
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| show | is on main sequence
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| show | binary stars
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| two stars orbiting a center of mass around each other | show 🗑
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| name the 3 types of binary stars | show 🗑
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| we can measure ___________ binary stars by measuring brightness over time | show 🗑
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| We can measure ____________ binary stars using Doppler shifts | show 🗑
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| show | mass
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| show | 100 times... .08 times
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| Sun's life expectancy is | show 🗑
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| show | gas
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| show | dust
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| general term for fuzzy objects in sky | show 🗑
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| show | dark nebula
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| dust cloud glows due to hot stars | show 🗑
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| Nebula which scatters blue light | show 🗑
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| emission nebulae are made of | show 🗑
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| The most prominent emission line from emission nebulae is the | show 🗑
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| Stars within nebulae cause dust and gas to | show 🗑
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| show | a few tens of kelvins
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| dark nebulae absorb ______ and emit _______ | show 🗑
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| show | horsehead nebula
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| show | 21cm
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| some molecules used to study dust clouds are | show 🗑
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| The formation of stars goes | show 🗑
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| as the dust cloud collapses, the cloud | show 🗑
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| when stuff falls through disksa nd into stars, this is called | show 🗑
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| show | magnetospheric accretion
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| In stage 1 of star formation | show 🗑
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| for a star to form, ________ must overcome the force of _____________ | show 🗑
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| show | thermal energy into infrared and radio photons
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| show | cloud fragments begin to collapse
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| show | the interior of the fragment has begun heating and is 10,000K
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| In stage 3 of star formation, collisions with particles in the cloud, cause it to | show 🗑
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| When, during star formation, the star first appears on the H-R diagram, it is a | show 🗑
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| Stage 4 of star formation is | show 🗑
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| show | Protostars luminosity decreases as temperature rises
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| Stage 6 of star formation is | show 🗑
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| show | star has reached main sequence, remains until hydrogen burns out
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| If the mass of the original star is not enough, it becomes | show 🗑
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| True or false: when photons strike matter, they exert pressure? | show 🗑
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| show | 300Msun, .08Msun
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| Star clusters are the best way to study star formation since | show 🗑
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| The two types of star clusters are | show 🗑
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| Open star clusters are | show 🗑
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| show | old, strongly bound, mostly in halo, densely packed
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| When a star leaves main sequence, what it becomes is based on | show 🗑
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| when a star leaves main sequence, if it has high mass it __________ if it has low mass it __________ | show 🗑
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| show | subgiant
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| show | red giant
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| show | helium fusion
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| When the core reaches 10^8, what happens | show 🗑
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| helium fuses to | show 🗑
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| After a helium flash, the star becomes | show 🗑
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| Stage 11 the star moves | show 🗑
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| stage 12 the star is | show 🗑
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| a nebula has 2 parts | show 🗑
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| show | white and brown dwarves
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| show | the remaining core of dead stars
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| show | 1.4Msun
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| When a white dwarf in a binary star pair gets hot enough, a | show 🗑
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| show | an 8 solar mass star cools off
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| a supernova is ______ times more luminous than a nova | show 🗑
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| show | carbon detonation and death of a high mass star
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| show | a white dwarf accumulates too much mass
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