It is flooded with light.

Something that is helpful

To move from one place to another

The astronomers. They began to realize it in the 1970s.

Turtles do not feel safe on brightly lighted beaches. They won't come to shore to lay their eggs. This affects their reproduction process.

About 1,500 stars.

We learn about our place in the universe.

Was that harms nature.

It is caused by excess light that is beamed into the sky. It reflects onto low clouds, causing a sky glow that blots out the stars.

They need to crawl to the water. Light coming from the land leads them the wrong way. As a result, the turtles wander into street and parking lots and get lost.

Migratory birds use the stars like street signs to find their way. Bright lights sometimes confuse birds in flight. The birds veer off course.

It's a short piece of nonfiction writing about one subject.

In 1879.