What Method Is Used by Astronomers to Infer the Existence

question 131

Multiple Choice

What method is used by astronomers to infer the existence in space of a dark object of about 5 solar masses, such as a black hole?

• A) infrared imaging of a region whose effective temperature is lower than the cosmic microwave background, rendering it dark
• B) measurement of the gravitational redshift of spectral lines in the spectrum of the object
• C) measurement of the effect of its gravitational force on a companion object in a binary system
• D) estimation of the luminosity of the object and the application of the mass-luminosity relationship

Assess the effects of changes in currency value on international trade and tourism.

Calculate currency conversions to evaluate the best purchasing options across countries.

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Definitions:

Nerve

A bundle of fibers that transmits electrical impulses toward and away from the brain and central nervous system.

Muscle

A tissue composed of fibers capable of contracting to effect bodily movement.

Bone

A rigid organ that constitutes part of the vertebrate skeleton, composed primarily of calcium phosphate and collagen, providing support and protection.

Neuroglial Cells

Supportive cells in the nervous system that provide protection, support, and nutrition to neurons.