Nebular Theory, Terrestrial and Jovian Planets

What theory explains the formation of the solar

system and proposes that the Sun and planets formed from a rotating

cloud of interstellar gases (mainly hydrogen and helium)

and dust?

• Big Bang Theory

• Nebular Theory

• Capture Theory

• All of the above

Which of the following statements is TRUE?

• The planetesimals that formed beyond the orbit of Mars,

  where temperatures were high, contained high percentages

  of ices

  and small amounts of rocky and metallic debris.

• As the solar nebula contracted

  due to gravity, most of the material collected in the center to

  form the planetesimals.

• The composition of planetesimals was largely determined

  by their proximity to the protosun.

• Between the present orbits of Mercury and Mars, the planetesimals

  were composed of materials with low melting

  temperatures.

TRUE or FALSE. Planetesimals

which are composed of metals and rocky substances through

repeated collisions and accretion, these asteroid-sized rocky

bodies combined to form the four protoplanets that eventually

became Mercury, Venus, Earth, and Mars.

• TRUE

• FALSE

Which of the following statements is FALSE?

• The composition of planetesimals was largely determined

  by their proximity to the protosun.

• As the solar nebula contracted

  due to gravity, most of the material collected in the center to

  form the hot protosun.

• The planetesimals that formed beyond the orbit of Mars,

  where temperatures were low, contained low percentages

  of ices.

• A rotating

  cloud of interstellar gases

  and dust is called the solar nebula.

Repeated collisions resulted in most of the material clumping

together into larger and larger chunks that eventually became

asteroid-sized objects called __________

• planetesimal

• protosun

• nebula

• cloud of dust and gas

What are the variables used as basis for the division of the planets in the solar system?

• location, size, shape

• size, shape, temperature

• location, size, temperature

• location, size, density

Which of the following statements is FALSE about terrestrial planets?

• Relatively small in size and mass

• Rocky surface

• High average density

• All have rings.

Which of the following statements is TRUE about Jovian planets?

• High average density

• Only Saturn has rings.

• Do not have craters.

• Relatively small in size and mass

Which of the following statements is TRUE?

• The terrestrial planets are less dense, having relatively miniscule

  cores of iron and nickel.

• Jovian planets have thick atmospheres as compared to meager atmospheres of terrestrial planets.

• Jovian planets are mostly gas with solid surface.

• None of the above

TRUE or FALSE: Airless bodies develop where solar heating and

gravities are weak.

• TRUE

• FALSE