The existence of dark matter has not yet been fully proven.

Antibiotics don't work for colds, so please don't take them unnecessarily.

It is said that antimatter has properties opposite to those of matter.

We exist as a part of the material world.

This food may contain carcinogens.

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

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

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

We are a part of the Milky Way.

He found her on a dating website.