What Do Astronomers Mean When They Say That the Universe

question 49

Multiple Choice

What do astronomers mean when they say that the universe is homogeneous?

• A) All stars in all galaxies have planetary systems just like ours.
• B) The universe appears the same no matter where you look.
• C) Galaxies are generally distributed similarly throughout the universe.
• D) Generally speaking, there is little difference between conditions on Earth, in the Sun, or in outer space.

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Definitions:

Ketones

Organic molecules defined by the presence of a carbonyl group (C=O) attached to two carbon atoms.

Aldehydes

Organic compounds characterized by the presence of a carbonyl group connected to at least one hydrogen atom, with the general formula R-CHO.

Stereochemical Designators

Symbols used to describe the spatial arrangement of atoms or functional groups in a molecule.

IUPAC Name

The official systematic name of a chemical substance as determined by the International Union of Pure and Applied Chemistry guidelines.