Measurements from Distant Galaxies Indicate That Supernovae Should Occur at a Rate

question 130

Multiple Choice

Measurements from distant galaxies indicate that supernovae should occur at a rate of five per century in a spiral galaxy such as the Milky Way,but only three have been recorded in this Galaxy in the past 1000 years.Explain.

• A) Most supernovae produce X-rays and radio waves, not visible light, and were hence invisible to earlier observers.
• B) The majority of supernovae must have occurred in the plane of the Milky Way and hence were hidden from Earth by the dense gas and dust in the Milky Way plane.
• C) The Milky Way Galaxy is somehow different, with much lower numbers of very massive stars in general, so many fewer stars have undergone supernova explosions.
• D) Observers were not watching the sky carefully enough, particularly through the Dark Ages and over the past few centuries.

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Definitions:

Transformational Behavior

Actions and behaviors exhibited by leaders that motivate and inspire followers to exceed their own interests for the sake of the organization or group.

Idealized Influence

A leadership approach where leaders become role models by acting in ways that inspire and earn the admiration, respect, and trust of their followers.

Self-sacrifices

Denotes the act of giving up one's own interests, comfort, or well-being for the benefit of others or for a greater cause.

Attributions Of Charisma

The process of attributing charismatic qualities to a leader by their followers, based on the leader's behavior or communication.