If a Star Has a Parallax of 0

question 73

Multiple Choice

If a star has a parallax of 0.02 seconds of arc, then its distance is

• A)20 pc.
• B)50 pc.
• C)2 pc.
• D)5 pc.
• E)500 pc.

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Definitions:

(1S,2R,3R,5R)-Pinanediol

A diol with a specific stereoisomeric configuration, derived from pinene, used in organic synthesis to protect or prepare chiral intermediates.

Fischer Projections

A method for representing three-dimensional molecular structures in two dimensions, often used for carbohydrates and amino acids, showing the configuration of chiral centers.

S-Alanine

An enantiomer of the amino acid alanine, specifically the S-configuration, which is the form incorporated into proteins.

Boiling Point

The temperature at which a liquid's vapor pressure equals the external pressure surrounding the liquid, causing it to change into vapor.