The Andromeda Spiral Galaxy Is Almost Edge-On to Us

question 121

Multiple Choice

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

• A)using Hubble's law.
• B)measuring Doppler shifts of different parts of the disk.
• C)the steady state theory.
• D)measuring Doppler shifts of different parts of the disk.

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Definitions:

Gross Primary Productivity

The total rate at which an ecosystem's producers, like plants, convert solar energy into chemical energy in the form of biomass.

Photosynthesis

A method by which plants and other organisms transform light energy, often from the sun, into chemical energy that can subsequently be utilized to power the organism's functions.

Third Trophic Level

The level in an ecosystem's food chain occupied by secondary consumers, which eat primary consumers.

Herbivore

An animal that feeds on plants or algae. Also called primary consumer.