What Discovery in 1998 Changed Our Understanding of the Overall

question 43

Multiple Choice

What discovery in 1998 changed our understanding of the overall history of the universe?

• A)The universe is permeated with radiation at microwave frequencies.
• B)The universe is expanding, and has been since the Big Bang.
• C)The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch.
• D)The expansion of the universe is accelerating, due to an unknown cause known as dark energy.
• E)Rotational measurements of our galaxy and others demonstrated the existence of dark matter.

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Definitions:

Gotti Family

A notorious crime family based in New York, well-known for their involvement in organized crime activities.

Informant

An informant is a person who provides confidential information or intelligence, especially to the police or other authority.

Physical Change

A change in which the form of matter is altered but one substance is not transformed into another.

Chemical Identity

The unique combination of chemical properties and composition that precisely identifies a substance.