How Have Astronomers Measured the Acceleration of the Universe

question 108

Multiple Choice

How have astronomers measured the acceleration of the universe?

• A)by comparing lookback times for white- dwarf supernovae (by measuring their apparent brightness)with the average distance between galaxies (based on their cosmological redshifts)
• B)by measuring changes in galaxies' redshifts from year to year
• C)They have not. It is a purely hypothetical idea.

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Definitions:

Technological Knowledge

Society’s understanding of the best ways to produce goods and services.

Human Capital

The collective skills, knowledge, or other intangible assets of individuals that can be used to create economic value.

Diminishing Returns

An economic principle stating that as investment in a particular area increases, the rate of profit from that investment, after a certain point, cannot continue to increase if other variables remain constant.

Catch-Up Effect

The theory that poorer economies will tend to grow at faster rates than wealthier ones, allowing them to catch up in terms of income and other economic measures.