science- chapter 25
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15 terms
Terms | Definitions |
|---|---|
 constellations | appear to change throughtout the year because the Earth revolves around the Sun |
| Sirius | the brightest star in the night sky |
| parallax | what you use to measure the distances for nearby stars |
| main sequence stars | about 90% of all stars |
| blue in color | the hottest stars in space |
| giant | what a main sequence star becomes after it uses up the hydrogen in its core |
| energy | what the Sun produces by fusing hydrogen into helium in its core |
| prominences | the intense magnetic field associated with Sunspots that may cause huge arching columns of gas |
| Sun | is a main sequence star, it's a yellow star and it is of average absolute magnitude |
| elliptical galaxy | a galaxy that has a shape similar to a football |
| The Milky Way | has more than 800 billion stars; is a member of the Local Group; is about 100,000 light years across |
| The Big Bang Theory | the formation and expansion of the universe is supported by the observed red shift in light beyond the Local Group |
| Rigel | does not look as bright in the night sky |
| A black hole | an object so dense that nothing can escape its gravity field |
| Sunspots | dark cooler areas on the Sun's surface |
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