Exam 15: The Origin of the Solar System

Which one of the following objects is most like the planetesimals that formed in the solar nebula

A meteoroid, meteor, and meteorite could come from the same celestial body.

The planets all lie in nearly the same plane resulting in a disk-like structure for the solar system. This disk-like structure is believed to exist because

Which are the oldest solar system objects that have been dated radioactively What are their ages

in the following cartoon, the interior of a planet has separated into the layers shown by a process known as ___________.

The adding of material an atom at a time to create a solid grain or flake is the process of ____________.

____________ is the separation of material in a newly formed planet or asteroid according to density. This happens when the object becomes molten.

The pressure of sunlight was one of the forces that cleared the solar nebula.

Debris disks are cold dust disks around main-sequence stars that are produced by collisions among planetesimals.

Describe four effects that helped to clear the solar nebula.

In one sentence, write a scenario involving a meteor, meteorite, and meteoroid.

We observe a planet crossing in front of its host star and the planet is smaller than the star. We call this crossing motion a ____________.

The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system

An extrasolar planet is

Sweeping up of space debris by the planets.

The ____________ planets have larger radii than the ____________ planets.

Solar wind: the flow of ionized hydrogen and other atoms away from the Sun's upper atmosphere. The strong surging wind from the young Sun may have helped push dust and gas out of the nebula.

Cold dust disks are _____________ disks around main-sequence stars, the dust of which is created by collisions among the planetesimals.

On a photograph of the Moon, the Moon measures 30 cm in diameter and a small crater measures 0.2 cm. The Moon's physical diameter is 1738 km. What is the physical diameter of the small crater

Massive planets create ____________ Doppler shifts of their stars than lower-mass planets.