51.In the nebular theory, the process by which planets form is referred to as

A)accumulation

B)fusion

C)agglomeration

D)accretion

52.In the outer regions of the solar nebula where temperatures were low,

A)only rock and iron could condense

B)only hydrogen compounds could condense as ices

C)hydrogen and helium gases were able to condense

D)in addition to rock and iron, hydrogen compounds also condensed as ices

53.The outer Jovian planets most likely formed from

A)clumps of hydrogen and helium gas spun from a rapidly rotating protosun

B)larger collections of hydrogen and helium gas attracting particles of rock and ice to them

C)the collision and coalescence of clumps of hydrogen and helium gas within the solar nebula

D)planetesimals of rock and ice attracting hydrogen and helium gas from the solar nebula

54.According to the nebular theory for the formation of the solar system,

A)planets should be rotating in the same direction as they orbit the Sun

B)planets can be rotating in any random direction compared to the direction they orbit the Sun

C)planets should be rotating in the opposite direction to the direction they orbit the Sun

D)no prediction is made as to the directions of rotations of the planets

55.Which of the following properties of the planets in our solar system is not explained by condensation theory?

A)direction of revolution

B)rotation rates

C)chemical compositions

D)orbital shapes

56.Given the basic building blocks of planets are widespread and the same laws of physics operate everywhere, we would expect

A)we have not detected any other planetary systems so we have no way of knowing

B)other planetary systems to be identical to our own with the same number and types of planets as our own solar system

C)other planetary systems to be laid out in a similar manner to our own with inner rocky terrestrial planets and outer gaseous Jovian planets

D)other planetary systems to be very different than our own because the detailed conditions that existed in our own solar nebula are unlikely to have been replicated elsewhere

57.The larger moons of the Jovian planets

A)were probably formed from spinning disks of gas that surrounded the planets

B)are most likely gravitationally captured asteroids and comets

C)formed when large planetesimals collided with them

D)were spun out from their parent planets due to their rapid rotation

58.The tiny outer moons of the Jovian planets

A)were probably formed from spinning disks of gas that surrounded the planets

B)are most likely gravitationally captured asteroids and comets

C)formed when large planetesimals collided with them

D)were spun out from their parent planets due to their rapid rotation

59.Asteroids and comets are

A)planetesimals left over from the era of planet formation

B)former moons of the jovian planets that were lost into interplanetary space

C)the remnants of early planets that fragmented into pieces

D)fragments of material blasted from the inner planets during the era of planet formation

60.Most asteroids tend to reside in the asteroid belt due to the gravitation influence of

A)the Sun

B)Mars

C)Jupiter

D)nearby stars