Two Spaceships Are Approaching One Another, Each at a Speed

question 87

Short Answer

Two spaceships are approaching one another, each at a speed of 0.31c relative to a
stationary observer on Earth. What speed, in terms of the speed of light, does an observer
on one spaceship record for the other approaching spaceship?

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Definitions:

Yolk Sac

An extra-embryonic membrane in many vertebrates that provides food for the embryo via absorbed nutrients.

Gas Exchange

The biological process through which organisms exchange oxygen and carbon dioxide with their environment, typically occurring in the lungs or gills.

Fetus

A developing mammal or human from the end of the embryonic stage, recognizably human in form, until birth.

Amnion

A thin membrane forming a closed sac around the embryo in amniotes, containing the amniotic fluid, which provides a protective environment.