Shadow.

Just like you or me, Earth casts a shadow. Earth’s shadow extends millions of miles into space, in the direction opposite the sun. There are several good times to think about 

and be aware of Earth’s shadow.

You can see Earth’s shadow any clear evening ascending in the eastern sky at the same rate that the sun sets below the western horizon. The shadow is a deep blue-grey, and it’s darker than the blue of the twilight sky. The pink band above the shadow is called the Belt of Venus.

The shadow of the Earth is big. You might have to turn your head to see the whole thing. And the shadow is curved, in just the same way that the whole Earth is curved.

Read the rest at EarthSky.