How Fast Does Light Travel from Proxima Centuri to Earth

question 27

Multiple Choice

How fast does light travel from Proxima Centuri to Earth?

• A) 4.2 ly
• B) 4.2 years
• C) 3 × 10⁸ m/s
• D) None of the other choices are correct.

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Definitions:

Identical Twins

Twins that originated from the same fertilized egg, sharing all of their genetic material, and typically having very similar appearances.

Dizygotic Twins

Dizygotic twins, also known as fraternal twins, are produced from the fertilization of two separate eggs during the same pregnancy, sharing about 50% of their DNA.

Fraternal Twins

Siblings born at the same time from separate eggs fertilized by different sperm cells, sharing 50% of their DNA.

One-Child Policy

A government-imposed limit of one child per family, famously utilized by China from 1979 to 2015 to control population growth.