Unit 2 Test Review 2023

The planets in our solar system are thought to have come from

• clumps of rocky material that exists between the stars

• the same cloud of gas and dust in which the sun formed

• the cloud of gas in the Orion nebula

• the sun

The outer planets are mostly large and gaseous because

• beyond the frost line, H froze to form the jovian planets

• the Sun's gravity caused the denser rock and metals to settle towards the center of the solar system

• beyond the frost line, the gravity of large, ice-rich planetestmals captured the abundant light gases

• the disk's spin flung lighter materials farther from the sun

As the solar nebula collapsed under its own gravity,

• it increased in temperature and increased in spin

• it decreased in temperature and increased in spin

• it decreased in temperature and decreased in spin

• it increased in temperature and decreased in spin

The nebular theory of the formation of the solar system successfully predicts all but one of the following. Which one does the theory not predict?

• planets orbit around the sun in nearly circular orbits in a flattened disk

• the compositional differences between the terrestrial and jovian planets

• the equal number of terrestrial and jovian plantes

• asteroids, Kuiper-belt comets, and Oort cloud

The age of our solar system is approximately

• 10,000 years

• 3.8 million years

• 4.6 million years

• 4.6 billion years

True or False: Nebular theory predicts that other solar systems that formed in the same way should also have eight planets.

• True

• False

This type of planet(s) have many moons.

• Inner

• Outer

This type of planet(s) tend to have rings.

• Inner

• Outer

This type of planet(s) tends to have a higher surface temperature.

• Inner

• Outer

Sunspots are believed to be most closely related to the Sun's

• corona

• period of rotation

• magnetic field

• changing size