MIDTERM STUDY NOTES (KEY CONCEPTS)

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Because the light that we see from distance stars/galaxies took time to reach us. This is also the distance between the sun to the earth y earth s orbital path is called ecliptic. Which means that it s not a perfect circle around the sun, but rather, is closer at one point than another. y earth s axis is tilted 23. 5 degrees from a line perpendicular to the ecliptic plane. The tilt is orientated so that it points directly to the star polaris or the north star. y milky way is also rotating y galaxy s have more mass than what is seen. However, it is also comprised of dark matter (no light comes from it) Chap 2 y constellation is a region of the sky with sell defined borders. There are 88 official constellations y the celestial sphere: stars in a particular constellation appear to lie close to one another but may be quit far apart in reality.

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