Mexico’s capital was lit ... and heat from entering the earth’s atmosphere. They are usually defined as being brighter than the moon in the night sky.

For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

Find out what's up in your night sky during April 2025 and how to see it in this Space.com stargazing guide. Looking for a telescope for the next night sky event? We recommend the Celestron ...