<span>Cells are everywhere. Even though most cells can’t be seen with the naked eye, they make up every living thing. Your body alone contains trillions of cells.</span>
From within the Moon's penumbra, a partial solar eclipse can be seen. Like any other opaque objects illuminated by a light source, the Moon and the Earth cast shadows into space as they block the sunlight that hits them. Each shadow has 3 different areas: the umbra, the penumbra, and the antumbra.
