Question

The authors' suggestion that "as much as 90 percent of the mass of the universe is not radiating at any wavelength with enough intensity to be detected on the Earth" would be most weakened if which of the following were discovered to be true?

• A. Spiral galaxies are less common than types of galaxies that contain little nonluminous matter.
• B. Luminous and nonluminous matter are composed of the same basic elements
• C. The bright nucleus of a typical spiral galaxy also contains some non luminous matter.
• D. The density of the observable universe is greater than most previous estimates have suggested.
• E. Some galaxies do not rotate or rotate too slowly for their rotational velocity to be measured

Answer 1

The correct option is A Spiral galaxies are less common than types of galaxies that contain little nonluminous matter.

Spiral galaxies contain stars, clouds, the gas which is nonluminous in nature which generates or creates light from other sources. So option "A" is correct because all nonluminous matter are included in spiral galaxies only and nonluminous are more known than spiral galaxies. And according to the findings, 90 percent of the mass of the universe is not radiating at any wavelength with enough intensity on Earth.