Planetary Nebulae Are So-Named Because

question 26

Multiple Choice

Planetary nebulae are so-named because

• A) these extended objects,often green-colored,looked like planets when first seen by nineteenth-century observers through their telescopes.
• B) the ejected material is rich in carbon and oxygen,necessary elements for the manufacture of planets in the nebulae surrounding stars.
• C) they rotate slowly and condense into planetary objects around a central star.
• D) their spectra appear to be similar to that of the giant gas planets in our own solar system.

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Definitions:

Bimodal Distributions

Probability distributions with two different modes or peaks, reflecting two dominant values in a dataset.

Central Tendency

A statistical measure that identifies a single value as representative of an entire distribution of data, aiming to define the center of the data set with measures such as mean, median, and mode.

Outliers

Observations in data that are significantly different from the majority of the data points, potentially indicating a measurement error or a novel finding.

Central Tendency

A numerical value that summarizes an entire data distribution by identifying a central point, like the average, midpoint, or most frequent value.