Why Do Rotation Curves of Galaxies Imply That Dark Matter

question 34

Multiple Choice

Why do rotation curves of galaxies imply that dark matter exists?

• A) The velocity of stars rises dramatically at large distances from the centers of galaxies,implying large amounts of dark matter cause these stars to move much faster than stars at smaller distances.
• B) The velocity of stars stays somewhat constant at distances beyond the visible edges of galaxies,implying that more matter than what we observe in stars and gas must be there.
• C) The velocity of stars is low in the inner regions of galaxies,suggesting that dark matter is impeding their motion.
• D) The velocity of stars rises quickly in the inner regions of galaxies,suggesting that unseen matter is gravitationally moving this material at faster rates than expected.

Differentiate between the intrapersonal, interpersonal, developmental, and fundamental perspectives of authentic leadership.

Analyze the role of positive psychological capacities in authentic leadership.

Evaluate the importance and impact of ethical and moral considerations in practicing authentic leadership.

Discuss the practical implications and outcomes of authentic leadership in organizational settings.

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Definitions:

Thalamus

A brain structure that relays sensory and motor signals to the cerebral cortex, and regulates consciousness, sleep, and alertness.

Nodes of Ranvier

Gaps in the myelin sheath of a nerve fiber that facilitate the rapid conduction of nerve impulses along the axon.

Axon Hillock

The cone-shaped area of the neuron cell body from which the axon originates, crucial for the initiation of nerve signals.

Neurofibrils

Fine, thread-like structures within nerve cells that provide support and conduct electrical signals throughout the neuron.