Exam 2

A  Is caused by the motion of Venus along an epicycle whose center orbits the Sun

B  Is caused by the “backward” rotation of Venus about its own axis

C  Is caused by the change in perspective as Venus catches up with, and passes, Earth while both planets orbit the Sun

D  Is caused by the gravitational tug of other planets on Venus

E  Was used by Galileo to explain the complete set of phases of Venus that he observed through his telescope

A  Saturn

B  Uranus

C  Jupiter

D  Neptune

A  TRUE

B  FALSE

A  longer than an Earth day

B  less than an hour

C  many Earth days

D  less than an Earth day

A  planets with an oxygen atmosphere

B  all of these choices

C  none of these choices

D  planets that could have liquid water

E  planets with a rocky surface

F  planets 1 AU from their star

A  older than

B  younger than

C  the same age as

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  Neptune and Uranus appear greenish blue because they are covered by a liquid water ocean

B  Of the four giant planets, only Saturn and Uranus have rings.

C  The giant planets consist mostly of hydrogen and helium,

D  Saturn’s rings rotate as a solid body, like a bicycle wheel and its spokes; all particles have the same orbital period.

E  Jupiter’s volume is roughly 10 times Earth’s volume

A  the same distance

B  now way to tell with available data

C  farther

D  closer

A  Uranus

B  Venus

C  Triton

D  Io

A  Mars

B  Venus

C  Mercury

D  Earth

A  It doesn’t revolve about the Sun like planets.

B  It’s orbit is not clear of other orbiting objects.

C  It fell into Neptune when their orbits crossed.

D  If it was a distant planet, it would be a gas giant planet.

A  randomly distributed throughout the solar system.

B  between the Sun and Mars.

C  among comets in the Oort cloud, beyond Neptune.

D  tidally-disrupted icy rock debris between Mars and Jupiter.

A  direct imaging

B  the transit method

C  gravitational microlensing

D  the Doppler-wobble method

E  astrometric measurements

A  Callisto

B  Titan

C  Io

D  Europa

A  the Moon has been around longer than the Earth and has been exposed to more periods of meteor bombardment.

B  the Moon is more distant than the Earth, causing incoming rocks to hit it first.

C  the Moon is much more deficient in iron relative to the Earth, causing craters to form more easily.

D  the Moon experiences frequent volcanic eruptions that cause craters.

E  the Moon experiences almost no erosion compared to the Earth, causing craters to remain much longer.

A  By observing the Moon long enough from Earth, night after night, we are able to draw a map of its entire surface.

B  At any given location on Earth, there are two high tides each day – one caused by the gravitational pull of the Sun, and the other by the gravitational pull of the Moon.

C  High tide occurs on the side of the Earth nearest to the Moon, while low tide occurs on the opposite side of the Earth.

D  The same half of the Moon’s surface is perpetually dark (craters on that side never see sunlight), leading us to call it the “dark side of the Moon.”

E  The orbital period of the Moon around the Earth and the rotation period of the Moon around its axis are equal.

A  FALSE

B  TRUE

A  Formation of the protosun,Ignition of the Sun,Formation of the Jovian Planets,Formation of the Terrestrial Planets,Late Heavy Bombardment

B  Formation of the Jovian Planets,Formation of the Terrestrial Planets,Formation of the protosun,Ignition of the Sun,Late Heavy Bombardment

C  Formation of the protosun,Formation of the Jovian Planets,Formation of the Terrestrial Planets,Ignition of the Sun,Late Heavy Bombardment

D  Ignition of the Sun,Formation of the protosun,Formation of the Jovian Planets,Formation of the Terrestrial Planets,Late Heavy Bombardment

A  Kuiper Belt,Mercury,Earth,MarsVenus,Jupiter,Uranus,Neptune,Saturn,Asteroid Belt

B  Mercury,Asteroid Belt,Venus,Earth,Mars,Kuiper Belt,Jupiter,Saturn,Uranus,Neptune,

C  Neptune,Saturn,Mercury,Venus,Earth,Mars,Jupiter,Uranus,Kuiper Belt,Asteroid Belt

D  Mercury,Venus,Earth,Mars,Asteroid Belt,Jupiter,Saturn,Uranus,Neptune,Kuiper Belt

A  a chunk broke off of the Earth

B  a captured comet

C  early solar system gas & dust

D  a collision with a rogue planet

E  Sun ejecta

A  Uranus

B  Mars

C  Jupiter

D  Venus

E  Mercury

A  ammonia

B  nitrogen

C  methane

D  hydrogen

E  helium

A  Ariel

B  Phobos

C  Luna

D  Io

E  Triton

A  TRUE

B  FALSE

A  Mars

B  Uranus

C  Venus

D  Earth

A  They are the most massive of all the planets in the Solar System since they are mainly composed of heavy elements like iron.

B  They generally have the thickest atmospheres of all the planets in the Solar System

C  They are the largest of all planets in the Solar System, with diameters up to nearly 1/10 the diameter of the Sun.

D  They have many moons, probably due to their large gravitational fields.

E  Despite their size, they rotate about their axis very rapidly, in fewer than 24 hours.

A  Groupings of stars in the sky that are smaller than constellations.

B  Meteorites falling on a radiant from the Perseid star cluster.

C  Objects smaller than comets; most between Mars and Jupiter.

D  Any astronomical object.

A  earthquake map

B  continents shifting over a convecting mantle

C  lava erupts at random

D  Earth’s mantle consists of stacked rock plates

A  At a given time, a total lunar eclipse is visible only from a small part of the Earth’s surface.

B  Total lunar eclipses last longer than total solar eclipses

C  The Moon is still visible during a total lunar eclipse because of light going through the Earth’s atmosphere.

D  Lunar eclipses don’t occur monthly, because the inclination of the Moon’s orbit around the Earth relative to the Earth’s orbit around the Sun.

E  Lunar eclipses are predictable.

A  coma

B  nucleus

C  ion tail

D  dust tail

A  TRUE

B  FALSE

A  Jovian planets rotate very rapidly, and some material near the equator of these planets was flung outward, forming the rings

B  tidal forces prevent the material in rings from forming into moons

C  tidal forces cause volcanic eruptions on some moons, and part of this material subsequently escaped the gravity of the moons, forming the rings.

D  their thick gaseous atmospheres would disintegrate any small rock that enter them

E  there is too much material to have fit into the ball of each planet

A  Venus

B  Uranus

C  Io

D  Triton

A  TRUE

B  FALSE

A  FALSE

B  TRUE

A  The greenhouse effect occurs when an atmosphere is transparent to optical or visible light but translucent to infrared light, thus trapping the heat.

B  No greenhouse effect currently occurs on Earth, and this is a good thing for humans.

C  An extreme, possible runaway, greenhouse effect occurred on Venus, making its planetary surface the hottest in the Solar System.

D  Venus’s atmosphere is much thicker than that of Earth – but some of Earth’s gases are trapped in rocks and oceans.

E  If we dump much more carbon dioxide in Earth’s atmosphere, Earth will become hotter because of the greenhouse effect.

A  TRUE

B  FALSE

A  The planet rotates once every 2/3 revolution about the Sun.

B  The planet rotates once every 243 days, but the atmosphere rotates faster.

C  The rotation axis is almost in line with the solar ecliptic

D  The rotation is counter-clockwise.

A  it is impossible to tell when most comets will return close to the Sun

B  comets are not gravitationally bound to our Solar System

C  most comets only pass close to the Sun 2 or 3 times, and then they disintegrate

D  comets burn quite rapidly, using up all their fuel within a few decades

E  orbits of comets are highly eccentric and their semimajor axes are large

A  nucleus

B  coma

C  dust tail

D  ion tail

A  ocean storms & weather

B  periodic sloshing of liquid water.

C  none of these

D  gravitational attraction to astronomical objects

A  FALSE

B  TRUE

A  a tidal instability

B  an atmospheric disturbance where a comet landed years ago.

C  a volcanic eruption

D  a hurricane