What Evidence Tells Us That at Least Some Dark Matter

question 44

Multiple Choice

What evidence tells us that at least some dark matter consists of objects made of ordinary matter that orbit in the halo of the galaxy?

• A) We have detected gravitational lensing of distant objects that appears to be caused by unseen objects in the halo of our galaxy.
• B) Radio observations have detected numerous such objects in the galactic halo.
• C) Powerful new telescopes can see even the dimmest objects in the halo.
• D) The rotation curve of the Milky Way Galaxy shows that some dark matter must be ordinary.

Understand the concepts of sum of squares, mean square, and F statistic in ANOVA.

Recognize the assumptions necessary for conducting ANOVA.

Interpret the results and significance level in ANOVA.

Distinguish between different experimental designs in ANOVA.

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Definitions:

Neural Membrane

The lipid bilayer that encloses a neuron, playing a crucial role in the conduction of electrical impulses.

Resting Potential

The electrical potential of a neuron when it is not actively sending a signal, representing a state of readiness.

Synaptic Gaps

Small spaces between neurons where neurotransmitters are released to transmit signals from one neuron to another.

Neurotransmitter Receptor Sites

Specific locations on the surface of neurons that are designed to receive and respond to chemical messengers known as neurotransmitters.