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Study Guide for Exam 1 - Introduction to the Universe | ASTR 1000, Study notes of Astronomy

Material Type: Notes; Professor: Higdon; Class: Introduction to the Universe; Subject: ASTR Astronomy; University: Georgia Southern University; Term: Fall 2008;

Typology: Study notes

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Study Guide For Exam #1 Astro 1000 Fall 2008
This test will cover Lectures 1-6: the Nature of Science/Astronomy, the
Changing Night Sky, the Earth-like planets, and Jupiter.
No calculators or electronic gizmos will be allowed (none needed).
Strategies for preparation:
1) Study the lecture notes and identify the major points.
2) Study the chapters in the book & read the chapter summaries.
3) Work the Review/Discussion & Conceptual Self-Tests at the end of each chapter.
Lecture 1: Introduction to Astronomy
1. What is Astronomy? What does it deal with? What does it try to explain?
2. Why can one consider Astronomy to be the most “inclusive” science?
Why would a geologist find astronomy interesting? A climatologist? A
computer scientist?
3. What is a Scientific Theory? What must it be able to do? (answer: make
precise & testable predictions; must be expressed in mathematics;
should be elegant; should clear up lots of old questions & lead to lots of
new ones).
4. Can you prove a Scientific Theory? How many experiments does it take
to do this? If you can’t ever prove a theory, then how does science make
any progress at all?
Lecture 2: The Night Sky ( parts of Chap. 8 )
1. What things do you see when you look up in the sky on a dark night?
(Stars, Planets, the Milky Way, comets).
2. Why does the sky change from hour to hour? From month to month?
3. What is special about the star Polaris?
4. What are Constellations? Are the stars in a constellation physically
related? How old are the constellations that appear in cave paintings?
5. Why do we have Seasons? Why are the seasons reversed in the two
hemispheres (i.e., December means winter in Chicago but summer in
Sydney, Australia).
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Study Guide For Exam #1 Astro 1000 Fall 2008

This test will cover Lectures 1-6: the Nature of Science/Astronomy, the

Changing Night Sky, the Earth-like planets, and Jupiter.

No calculators or electronic gizmos will be allowed (none needed).

Strategies for preparation:

_1) Study the lecture notes and identify the major points.

  1. Study the chapters in the book & read the chapter summaries.
  2. Work the Review/Discussion & Conceptual Self-Tests at the end of each chapter._

Lecture 1: Introduction to Astronomy

  1. What is Astronomy? What does it deal with? What does it try to explain?
  2. Why can one consider Astronomy to be the most “inclusive” science? Why would a geologist find astronomy interesting? A climatologist? A computer scientist?
  3. What is a Scientific Theory? What must it be able to do? (answer: make precise & testable predictions; must be expressed in mathematics; should be elegant; should clear up lots of old questions & lead to lots of new ones).
  4. Can you prove a Scientific Theory? How many experiments does it take to do this? If you can’t ever prove a theory, then how does science make any progress at all?

Lecture 2: The Night Sky ( parts of Chap. 8 )

  1. What things do you see when you look up in the sky on a dark night? (Stars, Planets, the Milky Way, comets).
  2. Why does the sky change from hour to hour? From month to month?
  3. What is special about the star Polaris?
  4. What are Constellations? Are the stars in a constellation physically related? How old are the constellations that appear in cave paintings?
  5. Why do we have Seasons? Why are the seasons reversed in the two hemispheres (i.e., December means winter in Chicago but summer in Sydney, Australia).
  1. What are Solar Eclipses? What are Lunar Eclipses? Be able to explain how they are produced. What did the ancient Greek scientists correctly deduce about the Earth based on observations of Lunar Eclipses?
  2. What is a Light Year?

Lecture 3: Intro to the Solar System & The Earth ( parts of Chap. 8 )

  1. What is the definition of a planet? (3-criteria given in class)
  2. What are the two families of planets in our solar system?
  3. What is the “Central Problem” in Astronomy ( answer : figuring out the Distance to something in space. Once we have a distance, many other properties can be determined).
  4. How do we measure masses of objects? (answer: if they have something orbiting it).
  5. The Earth’s Interior Structure.
    • What are the four main regions (crust, mantle, outer-core, inner-core)
    • Describe their basic properties (solid or molten? Composition. Temp.)
    • The inner-core would be liquid due to its high temperature (6000 K) if not for the high pressure, which squeezes it into a solid.
  6. How do we learn about the Earth’s interior structure?
    • analysis of seismic-waves. Earthquakes  seismic-waes. “P” – or “primary” or “Pressure” waves. Up&down disturbances. “S” – or “secondary” or “shear” waves. Side-to-side disturbances.
    • “P” waves can travel through solid & liquid rock.
    • “S” waves cannot travel through liquid rock.
  7. The Earth’s Composition Changes with Depth ( Differentiation ). Why?
  8. Continental Drift.
    • How was continental drift first discovered?
    • What is it? What powers it?
    • How fast do the continents move on average.
    • Does this mean that continents are constantly changing position?
    • What happens when plates collide? (mountain ranges/earthquakes)
    • What happens when plates move apart? (volcanoes)
    • What happens when plates brush by each other? (earthquakes)
  9. The Earth’s Atmosphere
    • know its basic composition (78% Nitrogen; 21% Oxygen; 0.9% Argon; trace amounts of CO 2 & water vapor.

Lecture 4: Venus: Earth’s (“Evil”) Twin ( Chap. 9 )

  1. Orbit & Rotation
    • very circular, like Earth’s
    • 0.3 AU at closest
    • Venus spins on its axis very slowly & in opposite direction from other Earth-like planets.
    • prob. Collided with another object very soon after formation (4 billion years ago).
  2. Basic Properties
    • similar to Earth in mass, diameter, density (i.e., twin of Earth)
    • atmosphere present.
  3. Atmosphere
    • composition (96% CO 2 , no oxygen) – nearly all greenhouse gases!
    • mass (9-times more atmosphere than Earth)
    • surface pressure & temperature (high & hot!)
  4. Run-Away Greenhouse Effect on Venus
    • explain how this came about as a result of Venus being closer to the sun, and how it resulted in high surface temperatures.
  5. Surface of Venus
    • mapped accurately by orbiting radar
    • overall, flatter than the Earth
    • no crustal plates. No continents or continental drift.
    • Large craters visible on radar, but few small craters. Overall, only 1/10 the cratering of Mercury or the Moon. (Why?)
  6. Evidence for Volcanic Activity on Venus
    • recall the radar images of volcanoes
    • recall the radar images of lava flows
    • recall the radar images of lava domes
    • what is the evidence of on-going volcanic activity? (changing SO 2 in atmosphere; possible lightning near volcanoes)
  7. Venus’ Magnetic Field
    • surprise: no magnetic field!
    • why not? (hint: Venus rotates very slowly).
  8. Venus appears to have re-paved its surface with lava ~300 million years ago!
    • buried most of the craters under lava (certainly the small ones)

Lecture 5: Mars - The Red Planet ( Chap. 10 )

  1. Orbit, Rotation, & Basic Properties of Mars
    • Mars has an elliptical orbit
    • Martian day is 24-hours
    • Mars’ rotational axis is tilted like Earth’s  Mars has Seasons!
    • Mars is ~ ½ the Earth’s diameter
    • Mars is ~ 1/10 the Earth’s mass
    • Mars’ average density is significantly lower than Earth, Venus, & Mercury. (what can you conclude from this?)
    • Mars has an extremely thin atmosphere.
  2. Surface of Mars
    • Volcanoes (the biggest in the solar system)
    • Craters (“splosh” craters common)
    • Mariner Valley (not a real canyon – i.e., not formed by water).
    • no crustal plates. Crust is one piece. No continents or continental drift.
    • Mars’ surface divided into two halves:
      • Northern Plain: flat, low elevation, few craters
      • Southern Highlands: rugged, high elevation, lots of craters
    • Running water on Mars? What is the evidence? (Gullies at crater edges, flash-flood flows, ancient rivers)
    • Where did the water go???
    • Polar Ice Caps
      • composition; how they change with the seasons?
      • both polar ice caps are actually two ice caps in one. How is this? (the ice caps are frozen CO 2 and H 2 O)
      • during a summer does the water ice cap disappear?
  3. The Atmosphere of Mars
    • composition (mostly CO 2 , like Venus)
    • Mass (extremely thin atmosphere, not much protection from meteorites)
    • temperature and density (cold and thin)
  4. A Run-away Greenhouse Effect in Reverse!
    • be able to describe this process (i.e., green-house gases taken out of the atmosphere)
  5. Life on Mars
    • The three experiments of Viking I & II: what were they?
    • what was so important about the sterilized sample from Earth
    • Were the Viking experiments conclusive one way or the other? Did they produce a definite “yes” or “no” to the question of life on Mars?

core does on Earth: both produce their planet’s magnetic field.

  • Jupiter’s strong magnetic field captures charged particles from the Sun.
  • Jupiter’s magnetosphere is huge: 30-million km across, and extends out to Saturn. Saturn is sometimes inside Jupiter’s magnetosphere!
  • Jupiter has Aurora: Northern & Southern Lights!