ASTR 101-3, FALL 2010 1

LECTURE 8, SEPTEMBER 21, 2010

ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT

jcbrandt@unm.edu

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TEST NO. 1, HISTOGRAM

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Question 1

Which of the following are terrestrial planets?

a) only Earthb) Earth, Moon, and Venusc) Mercury, Venus, Earth, and Marsd) Mercury, Venus, Earth, Moon, Mars,

and Plutoe) Mercury, Venus, Earth, Moon, Mars,

and Ceres

Question 1

Which of the following are terrestrial planets?

a) only Earthb) Earth, Moon, and Venusc) Mercury, Venus, Earth, and Marsd) Mercury, Venus, Earth, Moon, Mars,

and Plutoe) Mercury, Venus, Earth, Moon, Mars,

and Ceres

Terrestrial planets are “Earth-like.”

Question 2

The major difference(s) between the terrestrial and jovian planets involve(s)

a) mass.b) density.c) rotation speed.d) density and rotation speed.e) mass and density.

Question 2

The major difference(s) between the terrestrial and jovian planets involve(s)

a) mass.b) density.c) rotation speed.d) density and rotation speed.e) mass and density.

Jovian planets are more massive, but less dense, than terrestrial

planets.

Question 3

Which of the following defines density?

a) mass times surface gravityb) mass divided by volumec) size divided by weightd) mass times surface areae) weight divided by size

Question 3

Which of the following defines density?

a) mass times surface gravityb) mass divided by volumec) size divided by weightd) mass times surface areae) weight divided by size

Density can be thought of as

MATTER SPACE

Lots of matter in a small space = HIGH density.

Little matter in a large space = LOW density.

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Question 11

Any theory of the origin of the solar system must explain all of these EXCEPT

a) the orbits of the planets are nearly circular, and in the same plane.

b) the direction that planets orbit the Sun is opposite to the Sun’s spin.

c) the terrestrial planets have higher density and lower mass.

d) comets do not necessarily orbit in the plane of the solar system.

Question 11

Any theory of the origin of the solar system must explain all of these EXCEPT

a) the orbits of the planets are nearly circular, and in the same plane.

b) the direction that planets orbit the Sun is opposite to the Sun’s spin.

c) the terrestrial planets have higher density and lower mass.

d) comets do not necessarily orbit in the plane of the solar system.

The planets do orbit in the same direction that the Sun spins.

Most also spin in that direction, and most also have large moons that orbit in that direction.

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Question 12

The condensation sequence theory explains why

a) our planet Earth has water and rain.b) stars are more likely to form large planets

orbiting very near.c) terrestrial planets are different from jovian

planets.d) the Moon formed near the Earth. e) Pluto has such a circular orbit.

Question 12

The condensation sequence theory explains why

a) our planet Earth has water and rain.b) stars are more likely to form large planets

orbiting very near.c) terrestrial planets are different from jovian

planets.d) the Moon formed near to Earth. e) Pluto has such a circular orbit.

The condensation sequence theory explains how the temperature of the early solar nebula controls which materials are solid, and which are

gaseous.

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HOW ABOUT THE REQUIREMENTS ?-1

• 1. PLANETS WIDELY SPACED• 2. PLANET ORBITS CIRCULAR• 3. PLANET ORBITS IN THE SAME PLANE• 4. ORBIT DIRECTIONS SAME AS SUN’S AXIAL

ROTATION• 5. ROTATION OF PLANETS IN THE SAME SENSE,

COUNTERCLOCKWISE

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HOW ABOUT THE REQUIREMENTS ?-2• 6. ORBITS OF MOON SYSTEMS, SAME SENSE,

COUNTERCLOCKWISE• 7. TEMPERATURE DISTRIBUTION,

DIFFERENTIATION, & DIFFERENT KINDS OF PLANETS

• 8. ROCKY DEBRIS = ASTEROIDS AND METEOROIDS, OLD AND NEITHER TERRESTRIAL NOR JOVIAN PLANETS

• 9. ASTEROID-SIZED ICY BODIES FORM THE KUIPER BELT, BEYOND NEPTUNE

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HOW ABOUT THE REQUIREMENTS ?-3

• 10. ICY FRAGMENTS, COMETS, FORM THE OORT CLOUD, AT LARGE DISTANCES & ROUGHLY SPHERICAL

• GENERALLY, THE AGREEMENT BETWEEN THE MODEL AND THE GENERAL RULES IS QUITE GOOD

• COLLISIONS ACCOUNT FOR SOME OF THE DEVIATIONS FROM THE GENERAL RULES