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McC 8Astronomy Ch 24
McC 8 Astronomy Ch 24
| Term | Definition |
|---|---|
| white dwarf | small, hot star consisting of a hot dense core contracting under the force of gravity |
| absolute magnitutde | actual amount of light a star gives off |
| apparent magnitude | amount of a star's light observed on Earth |
| parallax | apparent shift in position of an object when viewed from different places: used to determine distances |
| constellations | groups of stars whose positions in the sky seem to change as Earth moves |
| main sequence | classification of about 90 percent of the stars |
| nebula | earliest stage of a star's formation |
| giant | large, cool expanding star in which helium fuses to form carbon |
| light-year | distance light travels in a year (9.5 trillion km) |
| supergiant | relatively cool star that has expanded to more than 700 times as large as our sun |
| neutron star | star in which only neutrons can exist in its core |
| black hole | object so dense that nothing, including light, can escape it |
| supernova | produced from an explosion that occurs when a star's core collapses |
| binary star system | two stars revolving around one another |
| galaxy | large group of stars, gas, and dust held together by gravity |
| Big Bang Theory | explanation for the beginning of the universe |
| Why do stars shine? | energy produced by fusion |
| Friedmann Theory | universe began with a big bang followed by a big crunch |
| Steady-State Theory | universe is the same and never changes |
| Oscillating Theory | never-ending cycle of bangs and crunches |
| What determines how long a star lives? | the starting mass |
| Spiral Galaxy | dense central region surronded by arms; arms have young, stars, gas and dust; nucleus has older stars less gas and dust |
| Barred Spiral Galaxy | similar to Spiral Galaxy but arms have a pronounced bar portion coming from the nucleus |
| Elliptical Galaxy | round to discus shaped (football); old stars with little or no gas & dust |
| Irregular Galaxy | patchy sprawling collection of young stars with gas & dust |
| Name & Type of our Galaxy | Milky Way & Barred Spiral Galaxy |
| How are stars classified? | size, brightness and temperature |
| Colors of Stars from hottest to coolest | Blue, White, Yellow, Orange, Red |
| Brightness of a star depends on | size and temperature |
Created by:
MCJH
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