We are a part of the Milky Way.

He found her on a dating website.

The Solar System is composed of eight planets, including Earth.

In this experiment, we will use the International System of Units.

He is deeply involved in the study of the meridian system.

We use this coordinate system to locate the position of an object.

In physics, the inertial frame of reference is a very important concept.

This system is very complex.

The government declared a state of emergency to prevent the spread of the new coronavirus.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.