A(n) ____ is a commonly accepted set of scientific ideas and assumptions.

A(n) ____ is a commonly accepted set of scientific ideas and assumptions.

a. theory
b. paradigm
c. hypothesis
d. natural law
e. model

Question 2

Emission nebulae are also called ____ because they are composed of ionized hydrogen.

a. HI regions
b. HII regions
c. Bok globules
d. HeI regions
e. reflection nebulae

Question 3

A(n) ____ is a small circle whose center is located on the circumference of another larger circle.

a. equant
b. deferent
c. retrograde loop
d. ellipse
e. epicycle

Question 4

The ____ is the nuclear fusion of three helium nuclei to form a carbon nucleus.

a. proton-proton chain
b. Carbon-Nitrogen-Oxygen cycle (CNO cycle)
c. triple-alpha process
d. Coulomb barrier
e. infrared cirrus

Question 5

The book De Revolutionibus Orbium Coelestium

a. describes how Galileo's observations and Kepler's calculations proved the Copernican theory.
b. describes the construction of Galileo's telescope and his observations.
c. is a dialog written to convince the general public of the merits of the Copernican theory.
d. first described the Copernican theory.
e. describes the Tychonian theory.

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A(n) ____ is a commonly accepted set of scientific ideas and assumptions.

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