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Astronomy Review
| Term | Definition |
|---|---|
| Why is the Big Bang important? | energy to matter |
| When did it happen the big bang | 13 billion years ago |
| How does Hubble's law support the big bang theory? | age of the universe, distance galaxy moving faster and away universe is expanding |
| How does cosmic microwave background radiation support the big bang theory? | homogeneous radiation was 3000 k is now 3k cooled due to universe expanding |
| what is redshift | used to solve for recessional velocity difference between the measure of rest wave length. The wave length increasing; the object is moving away |
| How does one solve for the redshift of a galaxy? | Measured wavelength - rest wave length |
| What is the relationship between luminosity and mass | directly proportional |
| what characteristics of a star are represented on a HR diagram? | Color, Temp, Mass, Radios, Luminosity, Age |
| What is a brown dwarf | Still born star the mass is to small to create nuclear fusion |
| Describe the main sequence | 90% of all stars are located here hydrogen in to helium in a nuclear fusion |
| What is hydrostatic equilibrium | gravity= pressure-size of star doesn't change |
| what is hubbles constant? | H=D/V velocity of expanding universe or age of universe, Both start from nebula, Different-Massive supernova other black whole less mass white dwarf |
| size increases on the HR diagram | when go to the top right |
| Mass increases on the HR diagram | when go to the top left corner |
| surface temp increases on HR diagram | when go to the left |
| luminosity increases on the HR diagram | when it goes up |
| list the spectrum from hottest to coldest | O,B,A,F,G,K,M |
| list the colors hottest to coldest | Blue, White, Yellow, Orange, Red |
| Life cycle of a star | Nebula, Protostar, Main sequence, Red giant, Planetary nebula, White dwarf, Black dwarf |
| Black dwarf | lost all its energy and blended into space |
| Brown dwarf | is a failed star and did not have enough mass to start nuclear fusion |
| what is hubbles law | Distance and velocity are directly proportional outer galaxies move farther in the same amount of time |
| Red shift | Moves farther away |
| Blue shift | Moves closer away |
| Nuclear fusion | turn Hydrogen to Helium |
| white dwarf | hot surface temp low luminosity |
| Red giant | big high luminosity low surface temp |
| Blue giant | big high luminosity high surface temp |
| Red super giant | very big low luminosity low surface temp |
| What does a mass of a star determine | how soon it is going to die |
| how do scientists measure wave length | measured wave length-rest wave length |
| Luminosity | Total energy amount measured in a star |
Created by:
smeisman
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