What Leads Astronomers to Conclude That the Proto-Galactic Cloud (The

question 2

Multiple Choice

What leads astronomers to conclude that the proto-galactic cloud (the cloud from which our Galaxy formed) was roughly spherical?

• A) all black holes have spherical event horizons
• B) the shape of the disk and spiral arm of the Milky Way Galaxy is spherical, so the original cloud must have been too
• C) the oldest stars in the Galaxy (Population II stars, globular clusters) form a spherical halo around the Galaxy; they outline the original shape of the cloud that gave the Galaxy birth
• D) since the Big Bang that made everything was spherical, all structures in the universe must also be spherical
• E) actually, astronomers believe the original proto-galactic cloud was in the shape of a flat disk, like the Galaxy is now

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Definitions:

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, indicating how much individual values deviate from the mean.

Correlation

A statistical measure that expresses the extent to which two variables change together, indicating a relationship but not causation.

Standard Deviation

A measure that represents the dispersion or variation of a dataset relative to its mean, indicating how spread out the data points are.

Correlation

A numerical indicator showing how much two or more variables move in relation to each other.