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ASTRO 101 FINAL EXAM. QUESTIONS WITH 100% CORRECT ANSWERS

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Is the Universe finite? If space is positively curved, space is finite, but without a boundary. space is negatively curved or flat, space is infinite (unless a boundary or edge is imposed) How can we determine the curvature of the universe? The cosmic microwave background True or False: The Universe is curved to within 2% No, it is flat to within 2% How much of the Universe's density does dark matter take up? 23% True or False: 73% of the Universe's density is comprised of dark energy. TRUE What is dark energy? A uniform energy field that does not emit light; provides a repulsive force. Dark energy makes the expansion of the Universe speed up, while matter makes the expansion of the Universe slow down What is a habitable zone, and what does it depend on? Region around a star in which it is possible for a planet to have liquid water, and it depends on the star's luminosity What is Kardeshev's Scale? Measure of a civilization's level of technological advancement Does large mass of a black hole indicate a large radius when using the Schwartzchild radius? yes Smaller parallax = ? Farther Away

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ASTRO
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ASTRO

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ASTRONOMY 101 FINAL EXAM
How long does it take stars to circle back to their same location?
23 h, 56 m, 04 s




How long does it take the Sun to return to the same position?
Sun returns to same approximate location every 24 h




What is the general motion of the Sun and Moon?
Motion of sun and moon is East with respect to stars




What is the general motion of Mars, Jupiter and Saturn?
Mars, Jupiter and Saturn also move Eastward most of the time, but Westward when
opposite the sun




What is the general motion of Mercury and Venus?
Mercury and Venus move Eastward most of the time, but westward after maximum
Eastward elongation

,What do Star Trail measurements depend on?
The latitude of the observer




What path do the Sun and planets follow?
The ecliptic




How long does it take the Sun to travel around the ecliptic?
365 days




How long does it take the moon to travel around the ecliptic?
27 days




What is the order of moon phases from first to appear to last to appear?
New moon, First Quarter, Full Moon, Third Quarter.




How long between each phase of the Moon?
About 1 week

, What time does the first quarter moon rise?
noon




What time does the full moon rise?
Sunset (6 PM)




What time does the new moon rise
Sunrise




What time does the third quarter moon rise?
Midnight




Why do seasons occur on Earth?
the changing angle with which sunlight hits the Earth/ The changing North-South
position of the Sun in the sky during the year

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