HW5

A  There’s no way to determine which moon rotates the fastest without knowing their relative masses.

B  The moon closest to Daniel.

C  The moon farthest away from Daniel.

D  The smallest moon will orbit the fastest, just like Mercury (the smallest planet) orbits the Sun the fastest.

A  Our observations of a full or gibbous Venus provide evidence against the Ptolemaic, Earth-centered model of the Solar System

B  As seen from Earth’s surface, planets rise in the east and set in the west, even when they undergo retrograde motion.

C  According to Kepler’s first law, the orbit of planets are ellipses with the Sun at one focus; there is no object at the second focus.

D  If you lived on Mercury, you would notice that Earth exhibits retrograde motion for a while every year.

E  Copernicus’ model of the Solar System was accepted shortly after being proposed, because it provided significantly more accurate positions of the planets than did the Ptolemaic system.

A  A given planet’s speed among the background stars varies with time.

B  Jupiter’s four large moons.

C  Craters and mountains on the Moon.

D  Large numbers of stars in the Milky Way.

E  The full set of phases of Venus.

A  the west to east motion of a planet against the stars

B  the backward motion of a planet through the sky

C  the apparent backward motion of a planet against the fixed stars

D  the east to west motion of a planet compared to the viewer’s horizon

A  speed of revolution

B  radius

C  mass

D  distance from the Sun

A  FALSE

B  TRUE

A  in ellipses in random directions

B  bound by gravity of the planets

C  as far apart as possible

D  around the Sun in roughly the same plane

A  Each night, it makes a loop in the sky.

B  My life will be Topsy-turvy.

C  It travels from west to east each night.

D  It travels from east to west each night.

E  If I take a picture of it each week at roughly the same time, against the fixed stars, and connect the dots, it will appear to travel from west to east.

A  Venus revolved about the Sun.

B  Copernicus was wrong.

C  Venus rotated about Earth.

D  Both Venus & Mars had epicycles.

A  TRUE

B  FALSE