Having a dark cloud in the solar neighborhood greatly facilitates observation and measurement.

The stars sampled are similar to the immediate solar neighborhood.

It is the nearest subgiant star to the Sun and one of the oldest stars in the solar neighborhood.

About 1 in 800 (0.125%) of the main-sequence stars in the solar neighborhood are class B stars.

About 1 in 160 (0.625%) of the main-sequence stars in the solar neighborhood are class A stars.

About 1 in 33 (3.03%) of the main-sequence stars in the solar neighborhood are class F stars.

They make up about 12%, nearly one in eight, of the main-sequence stars in the solar neighborhood.

But no new spaceships entered the solar neighborhood from the empty reaches of interstellar space.

As derived below, they depend only on the motions and positions of stars in the solar neighborhood.

Irregularities oh plasma density in the solar neighborhood, Mon.