Answer Happy

Kirkwood Gaps are caused by:
the gravitational perturbations of Jupiter
the gravitational perturbations of Mars
unknown interplanetary forces
none of these
C-type asteroids:
are most common type within the asteroid belt
are composed of dark material
resemble carbonaceous chondrites
all of these
What are the Apollo asteroids?
the Apollo asteroids orbit between Jupiter and Saturn
the Apollo asteroids are a specific group of asteroids between
the Kirkwood Gaps
the Apollo asteroids are asteroids that cross the orbit of the
Earth
the Apollo asteroids orbit between the Sun and Mercury
The Titus-Bode Rule attempts to predict:
the orbital periods of the major planets
the distances of the major planets from the Earth
the distances of the major planets from the Sun
the correct sequence of planetary masses, from Mercury to
Neptune
The plasma tail of a comet:
is pulled from the coma by tidal forces from the Sun
is pushed out of the coma by the solar wind
is pushed out of the coma by radiation pressure from the Sun
is "boiled" off the coma by heat from the Sun
The asteroids most likely represent:
planetesimals that never accreted into a planet
escaped satellites of Mars
escaped satellites of Jupiter
a shattered planet