Nebular Theory

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Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the Nebular Theory?
Back
The Nebular Theory is a model that explains the formation of the solar system, suggesting that it formed from a rotating cloud of gas and dust (nebula) that collapsed under its own gravity.
2.
FLASHCARD QUESTION
Front
What is a protoplanet?
Back
A protoplanet is a large body of matter in orbit around the sun or another star that is in the process of forming into a planet.
3.
FLASHCARD QUESTION
Front
What are planetesimals?
Back
Planetesimals are small bodies from which a planet originated in the early stages of solar system formation.
4.
FLASHCARD QUESTION
Front
What is the significance of planets rotating counter-clockwise?
Back
Most planets rotate counter-clockwise due to the conservation of angular momentum from the original rotating nebula.
5.
FLASHCARD QUESTION
Front
What does it mean for planets to orbit the sun in the same plane?
Back
It means that the orbits of the planets are aligned along a flat disc-like structure, which is a key piece of evidence supporting the Nebular Theory.
6.
FLASHCARD QUESTION
Front
What is half-life in the context of radioactive decay?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
7.
FLASHCARD QUESTION
Front
If a sample has 6.25% of the parent isotope left, how many half-lives have passed?
Back
Four half-lives have passed.
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