What Did Carl Sagan Mean When He Said That We

question 134

Multiple Choice

What did Carl Sagan mean when he said that we are all "star stuff"?

• A) that life would be impossible without energy from the Sun
• B) that the Earth formed at the same time as the Sun
• C) that the carbon, oxygen, and other elements essential to life were created by nucleosynthesis in stellar cores
• D) that the Sun formed from the interstellar medium: the "stuff" between the stars
• E) that the Universe contains billions of stars

---

Definitions:

Gravitational Forces

The attraction between two bodies due to their mass, which dictates the motion of planets, stars, and other objects in the universe as described by the law of gravity.

Endocrine Glands

Glands of the endocrine system that release hormones directly into the bloodstream to regulate various bodily functions.

Central Nervous System

is a fundamental part of the neurosystem comprising the brain and spinal cord, responsible for processing and sending out information throughout the body.

Spinal Cord

is a long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the brainstem to the lumbar region of the spinal column, crucial for transmitting messages between the brain and the body.