Please enter something

Ast ch 14 and 15

question

The orbits of most asteroids
answer

Lie entirely beyond the orbit of Mars
question

The NASA orbit that ultimately landed on the surface of the asteroid Eros was
answer

Near Shoemaker
question

About what percent of all asteroids are C-Type?
answer

75%
question

About what percent of all asteroids are S-type?
answer

15%
question

What is the typical size of most known asteroids?
answer

A few kilometers
question

What are Dactyle, Gaspra, Mathilde, Eros, and Ida?
answer

The only four asteroids explored by spacecraft to date
question

What is the defining property of the Trojan asteroids?
answer

They have orbits at the distance of Jupiter and 60 degrees ahead of or behind it
question

The orbital resonances with Jupiter are shown in the
answer

Kirkwood Gaps
question

The type of asteroid that would appear darkest and reflect the least light is type
answer

C
question

The type of asteroid that would be the densest would be
answer

M
question

The three largest asteroids are
answer

Ceres, Pallas, and Vesta
question

On its way to Jupiter, Galileo also gave us close-ups of
answer

Gaspra and Ida
question

Before it arrived in orbit about Eros, the NEAR spacecraft also flew past
answer

Asteroid Mathilde
question

The Trojan asteroids have orbits that
answer

Stay 60 degrees ahead of or behind Jupiter
question

The Amor asteroids have orbits that
answer

Cross the orbit or Mars, but not Earth, at perihelion
question

Asteroid 2004 FH passed within a tenth of the Earth-Moon distance in March 2004. When its period was found to be about nine months, it was classified as an
answer

Aten Asteroid
question

Compared to Ida, Eros and Gaspra, what was odd about Mathilde?
answer

It was less dense than rock, but more than ice, suggesting a porous structure
question

The Apollo and Aten asteroids have orbits that
answer

Cross the orbit of Earth at perihelion
question

Which of the following objects never collide with the Earth?
answer

Amor asteroids
question

The major impact in the Yucatan wiped out the dinosaurs about:
answer

65 million years ago
question

The first hint of the role of asteroids in extinction of the dinosaurs came from
answer

Finding a layer of worldwide iridium enriched dust
question

The Kirkwood Gaps in the asteroid belt are due to resonances with Jupiter
answer

True
question

Most asteroids are differentiated, as reflected by their spherical shapes
answer

False
question

All known asteroids can be found in the asteroid belt
answer

False
question

Eros is the only asteroid upon which a spacecraft has landed
answer

True
question

Discovered by the spacecraft Galileo, Dactyl is a satellite of larger Ida.
answer

True
question

The asteroid Vesta seems to have once been volcanicly active, amazing for its small size
answer

True
question

About a trillion comets are thought to be located far, far beyond Pluto in the
answer

Oort cloud
question

The bright spherical part of a comet observed when it is close to the Sun is the
answer

Coma
question

A comet’s _________ stretches directly away from the sun
answer

Plasma tail
question

A comet’s ________ is the frozen portion of a comet
answer

Nucleus
question

Particles ejected from a comet can cause a ________ on Earth.
answer

Meteor Shower
question

The ________ extends from about beyond the orbit of Neptune to about twice the distance of Neptune from the Sun
answer

Kuiper belt
question

The Kuiper Belt objects have orbits that
answer

Lie just beyond Neptune and close to the ecliptic
question

Halley’s Comet last passed Earth in 1986. It will be due back in
answer

2061
question

What part of a comet has only been seen by a space probe?
answer

Nucleus
question

Most comets are discovered when their coma develops, giving them a fuzzy appearance instead of stellar such as asteroids
answer

True
question

The orbits of most comets
answer

Lie almost entirely beyond the orbit of Neptune
question

What are comets made of?
answer

All of the above
question

The Oort cloud is thought to be
answer

The spherical cloud of comets and some larger icy bodies surrounding the outer solar system
question

Long period comets are thought to reside mainly in the
answer

Oort Cloud
question

Pluto’s classification as a planet has been called into question
answer

True
question

Pluto is smaller than many moons in the solar system
answer

True
question

Pluto’s orbit takes it closer to the Sun than Neptune for part of its orbit
answer

True
question

Pluto is visible to the naked eye on extremely dark nights
answer

False
question

What is so unusual about Pluto’s orbit
answer

It is more inclined to the ecliptic than any of the eight planets
question

The two names most associated with the discovery of Pluto are
answer

Lowell and Tombaugh
question

Charon’s orbit
answer

Is highly inclined to Pluto’s orbital plane
question

Which of the following gives direct information about the age of the solar system?
answer

Meteorites from asteroid debirs
question

The most famous asteroid impact scar on Earth is located in
answer

Arizona
question

Meteorites are valuable to astronomers because
answer

They may provide evidence about the process in which the solar system was born
question

Large meteroids are thought to collide with Earth
answer

A few times every million-year period
question

Iron meteorites are believed to come from
answer

The core of a dense M-type asteroid, now broken up
question

Carbonaceous Chrondrites are believed to come from
answer

The crust of a differentiated C-type asteroid, now broken up
question

The body which wiped out the dinosaurs was about
answer

as big as one of Mar’s moons
question

The Perseid meteor shower gives us about a meteor every minute in mid
answer

August
question

Meteor showers result when asteroids collide and this debris showers the inner solar system
answer

True
question

Some meteorites found on Earth are believed to have originated from the Moon or Venus
answer

True
question

In terms of composition the Jovian planets
answer

are more like the Sun than are the terrestrials
question

In terms of its orbit, which of the terrestrials is oddest?
answer

Mercury
question

Why are the Jovian planets so large?
answer

They formed the largest protoplanets which swept gas from the solar nebula
question

What is a distinguishing characteristic of planetesimals which was critical to planetary formation?
answer

They were large enough so that their gravity could attract more material and still grow larger
question

How did Mercury’s location in the solar system affect its composition?
answer

Mercury is rich in metals because only metallic grains could survive the high temperatures so near the Sun
question

How does the melting and vaporization point of materials determine the composition of the planets?
answer

Durable solids that are very hard to melt and vaporize form close to the Sun, making terrestrial planets.
question

The concept that Jupiter and the other Jovians formed farther out than their present orbits is called
answer

planetary migration
question

The perturbations of Mars’ gravity prevented large planets from forming in the asteroid belt
answer

False
question

The Oort cloud is believed to be
answer

A spherical cloud of cometary nuclei far beyond the Kuiper Belt
question

The most distant objects in our solar system are
answer

in the Oort Cloud
question

Which of the following is not icy in composition
answer

Asteroids
question

The Kuiper Belt is
answer

A collection of asteroid-sized icy bodies located outside the orbits of Neptune
question

The chief reason the asteroid belt formed is because
answer

the gravitational perturbation of Jupiter disrupting stable orbits there
question

Why did a major planet not form out where the Kuiper Belt now lies?
answer

Some may have, but they have since migrated to orbits nearer the Sun
question

Objects that are in a 3:2 orbital resonance with Neptune are called
answer

Plutinos
question

Which of these is not a consequence of resonance?
answer

Venus’ cloud and surface rotation rates
question

A late collision with a large planetismal may have caused what feature on Mars?
answer

Its curious north-south asymmetry
question

“Catasrophes” are NOT needed to explian
answer

The asteroid belt
question

Some type of catastrophe is likely needed to explain the highly tiled rotational axis of Uranus
answer

True
question

Most scientists think catastrophes played little role in the solar system’s history
answer

False
question

Most extrasolar planets are hot Jupiters, discovered in the infrared by the Spitzer Space telescope
answer

False
question

We now know of over 100 jovians, but no terrestrial planets around other stars similar to the the Sun.
answer

True
question

Around other suns, we have found Jupiters where Mercury should be.
answer

True
question

None of the other stars yet studied has more than one planet orbiting it
answer

False
question

Which statement about extrasolar planets found to date is true?
answer

Some are so close to their stars that their periods are just a few days.
question

So far, beyond the solar system the extrasolar planets found have been mostly
answer

Large jovians with terrestrial-type orbits
question

Most of the extrasolar planets found have been mostly
answer

Noting the Doppler shifts of the star as the planet orbits it from side to side
question

When we are lucky enough to see an extrasolar planet transit its star
answer

We can by the drop in light find the planet’s size, mass, and density
question

As of early 2004, the number of extra solar planets found was
answer

Over 120, around over 100 typical nearby stars
question

Concerning our solar nebula theory, the presence of so many “hot Jupiters” gives us problems with how they can form that close to their star
answer

True
question

According to the Solar Nebula theory, planets
answer

Should be a common result of star formation
question

In comparing our own solar system with others found to date, we find:
answer

all of the above