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20 questions
The nebular theory is
How the solar system was formed
How the Milky Way galaxy was formed
How the solar system will be destroyed
How the universe was formed
A nebula is
A cloud of ice
A cloud of just gas
A cloud of dust and gas
A cloud of just dust
The most abundant gases in the nebula are
Hydrogen &Helium
Hydrogen & Oxygen
Nitrogen & Oxygen
Oxygen & Helium
A nebula starts to move because
A nearby star
A nearby supernova
A passing spaceship
A passing comment
A nebula starts to collapse because of
Gravity
A passing comment
A passing spaceship
A nearby star is shining it’s light
As a nebula collapses it also begins
Turn to ice
Rotate
Expand
Shake
A nebula collapses down into a disk known as
A circular disk
An irregular cloud
A compact disk
An accretion disk
What is forming in the accretion disk away from the center
Light
hydrogen
Proto stars
Planetesimals
The planetesimals keep
Breaking down into smaller pieces
Colliding and sticking together
Colliding and breaking apart
Colliding and bouncing around
The group of inner planets are known as
The terrestrial planets
The outer planets
The gas giants
The hallow planets
What caused a lighter elements to leave the terrestrial planets
Heat from the sun
Gravity from the sun
Gravity from the gas giants
Nothing the lighter element stayed
The group of outer planets are known as
The terrestrial planets
The rocky planets
The gas giants
The inner planets
Why did the lighter elements stay in the gas giants
Just because their own gravity is strong enough
Because the solar wind does not affect these planets AND their own gravity is strong enough
Just because the solar wind does not affect these planets
Because they are less dense
How long ago did these nebular processes start
4.6 million years ago
4.6 billion years ago
5.6 billion years ago
4.6 years ago
Intense pressure in the protosun (protostar) caused
Helium to break down into hydrogen
Nuclear fusion to start
Nuclear fusion to End
Fire in the sun to start
What percentage of the nebula will the sun accumulate
99%
75%
1%
50%
The shape of the planets and dwarf planets after accumulating all the material is
Irregular
A disk
A sphere
An oval
What materials cannot survive the heat where the rocky planets were formed
Gamma rays
Rocks
Ice and gas
Plasma
What to objects to scientist studies to learn about the formation of the solar system
comets & exoplanets
Exoplanets & asteroids
Asteroids & distant stars
Comets & asteroids
What forms in the very center of the accretion disk
A protosun
A planetesimal
A protoplanet
A planet
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