Astro Exam 2
Terms
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- What are the causes of the Earth’s spherical shape, equatorial bulge, and high core pressure?
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Shape=Gravity
Bulge=Spinning like a pizza
Pressure=The weight/density of everything on earth pushing against it - Why do we think the Earth’s core is iron?
- We measured its density
- How do we deduce details about the interior of the Earth?
- We see iron coming up and earthquakes.
- What is the most abundant gas in Earth’s atmosphere?
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Nitrogen
2nd=Oxygen -
What breaks up methane, ammonia, carbon dioxide and
oxygen molecules to change the atmosphere? - Sunlight/Ultraviolet light
- What are the greenhouse gases?
- CO2 H2O
- Precession (top-like rotation of Earth’s axis over 26000 years)
-
is caused by the Sun and Moon acting on the
equatorial bulge. - Source of regolith
- Pulverized Rock
- Rilles
- Cracks in the surface of moon
- What are the long-term effects of tidal braking?
- Moon moves away.
- What is the prevailing theory about the origin of the Moon?
- Collision and Reaccreation
- What are the phases of the moon during Neap and Spring tides, and during eclipses?
- Weak/Strong/ (New Moon/Full Moon)
- Which side of the Moon is thicker? What visual clues support this theory?
- The farside. The maria supports this.
- How much weaker is the Moon’s gravity than Earth’s?
- 1/6
- Solar day
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24Hr,
Time between subsequent sun passages of the meridian "Noon-To-Noon" - Mean Solar Day
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Exactly 24Hr,
Averaged over a year - Know the characteristics and distinctions between the Julian Calendar
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10 Months->12 Months
- Know the characteristics and distinctions between the Gregorian Calendar
- The calendar had drifted by 10 days
- Julian calendar has
- 365 Days and 1 day every four years
- Pope Gregories calendar has
- 365 plus every 4 years add one day except every year divisible by 400.
- Religious or Cultural Calanders
- Tend to be lunar based with holy days added.
- To which city in England are astronomical times referred?
- Greenwhich village
- Which culture is the source of our 24 hour day?
- Egypt
- Which culture originated division of times into 60 parts?
- Babylonians
- Sidereal Days
- TIme between subsequent passages of a star through meridian. 366.25 Sidereal days.