The Scientist Who First Proposed That Comet Nuclei Were "Dirty

question 26

Multiple Choice

The scientist who first proposed that comet nuclei were "dirty snowballs" was:

• A) Edmond Halley
• B) Fred Whipple
• C) Eugene Shoemaker
• D) Isaac Newton
• E) Jan Oort

---

Definitions:

Schema

Schema involves a cognitive framework or concept that helps organize and interpret information in the brain, facilitating understanding and prediction of the world.

Prototype

An original model or first form of something from which later versions are developed or copied.

Higher-order Conditioning

A learning process in which a conditioned stimulus is paired with a new neutral stimulus, creating a second (often weaker) conditioned stimulus.

Secondary Reinforcers

Stimuli that have become reinforcing through association with primary reinforcers; they do not satisfy biological needs but often hold value, such as money or praise.