Astronomy Review questions

Astronomy Review questions - Review questions I Why do/did...

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Review questions I Why do/did humans observe the sky? We observe the sky for time and calendar How many constellations cover the sky? 88 constellatons cover the sky Recognize constellations 1. Ursa Major (big bear; Big Dipper) 2. Ursa Minor (little bear; Little Dipper) – Polaris (Star in constellation) 3. Draco (dragon) 4. Bootes (herdsman) – Arcturus (Star in constellation-all have stars these named) 5. Corona Borealis (northern crown) 6. Hercules At what altitude is your horizon? 0 degrees At what altitude is your Zenith? 90 degrees At what declination is your Zenith? My own latitude At what Declination is the north celestial pole? 90 degrees At what Declination is the celestial equator? 0 degrees At what Altittude is the north celestial pole? Altitude of the north pole is your own latitude…Ann Arbor 42.3 degrees What are the directions/definitions of 0 degrees Azimuth and 0 degrees right ascension? 0 azimuth is towards north and increases towards the east. 0 right ascension is towards the point of vernal equinox and increases eastward. The vernal equinox is a well defined point in space, where the Sun seems to cross the celestial equator in the spring. Review questions II What is the structure of the solar atmosphere? Photosphere, Chromosphere, and Corona
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Which part of the atmosphere can be observed when? Photosphere What is the Sunspot cycle? Relatively dark areas on the surface of the Sun where intense magnetic activity inhibits convection and so cools the surface. 11 years: Most obvious is a gradual increase and decrease of the number of sunspots over a period of about 11 years Why do Aurorae occur? (Planet has to have magnetic field and atmosphere for Aurorae to occur) Ejected material is often bound by magnetic field; Coronal Mass Ejections (CMEs) blast particles into space-….also must have atmosphere to create light aurorae/northern lights on earth possible Review questions III How did the solar system form? Our Solar System began as a rotating metal enriched-cloud of gas and dust about 4.5 billion years ago. Something, perhaps a shockwave from a nearby supernova, caused that cloud to begin to collapse. Smaller particles clumped together into increasingly larger objects, with the greatest density in the center. The spinning motion caused the cloud to flatten into a pancake called an accretion disk. Over millions of years, the center of this disk accumulated mass, and as the mass increased, so did the temperature. Eventually, the core reached a critical point when it ignited – nuclear fusion began. The Sun was born. What’s the visible evidence for the formation? Once the planets were there the bombardment of smaller particles is what created craters. What’s the age of the solar system?
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Astronomy Review questions - Review questions I Why do/did...

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