Simplify the following text for a Grade 5 native English-speaking person.
Original: Since there is no actual communication between points in a shadow ( except for reflection or interference of light , at the speed of light ) , a shadow that projects over a surface of large distances ( light years ) can not give information between those distances with the shadow 's edge .
Simplified: This makes the shadow . A shadow is not completely black though , as some light reflects off other objects to reach the shadow area .