LECTURE 4, SEPTEMBER 2, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT ASTR 101-3, FALL 2010

a) planets move on epicycles. b) planets orbit the Sun in the same direction. c) Earth moves faster in its orbit. d) they are closer than Uranus. e) they rotate quickly on their axes. Mars, Jupiter, and Saturn show retrograde motion because Question 1

a) planets move on epicycles. b) planets orbit the Sun in the same direction. c) Earth moves faster in its orbit. d) they are closer than Uranus. e) they rotate quickly on their axes. Mars, Jupiter, and Saturn show retrograde motion because Question 1 As Earth overtakes and “passes” the outer planets, they seem to slow down and then reverse direction.

ASTR 101-3, FALL 2010

a) Hipparchus b) Galileo c) Tycho d) Copernicus e) Kepler Question 8 Who published the first astronomical observations made with a telescope?

a) Hipparchus b) Galileo c) Tycho d) Copernicus e) Kepler Question 8 Who published the first astronomical observations made with a telescope? Galileo published the “Starry Messenger” in 1610, detailing his observations of the Moon, Jupiter’s moons, stars, and nebulae.

ASTR 101-3, FALL 2010

Question 10 a) Kepler b) Newton c) Galileo d) Tycho Brahe e) Copernicus Which hero of the Renaissance postulated three “laws” of planetary motion?

Question 10 a) Kepler b) Newton c) Galileo d) Tycho Brahe e) Copernicus Which hero of the Renaissance postulated three “laws” of planetary motion? Note that Isaac Newton is also well known for three general laws of motion. But Kepler’s laws are about objects in orbits, like planets orbiting a star.

ASTR 101-3, FALL 2010

Question 14 Newton’s law of gravity states that the force between two objects a) increases with distance. b) depends on the state of matter (solid, liquid, or gas). c) can be attractive or repulsive. d) increases with mass.

Question 14 Newton’s law of gravity states that the force between two objects a) increases with distance. b) depends on the state of matter (solid, liquid, or gas). c) can be attractive or repulsive. d) increases with mass. The attractive force of gravity INCREASES with greater mass, and DECREASES QUICKLY with greater distance. The force doesn’t depend on the kind of matter.

ASTR 101-3, FALL 2010