In a new campaign to make the world aware of the threat from orbiting asteroids, American astronauts and astronomers are sponsoring a global program to be carried out by government space agencies and industries, astronomy organizations, schools and science museums on every continent.

They are proclaiming June 30 as Asteroid Day to focus on the effort.

Scientists know of two asteroids that have crashed on Earth, and they warn that someday one could wipe out all life in every country.

“The more we learn about asteroid impacts, the clearer it becomes that the human race has been living on borrowed time,” said Brian May, a noted British astrophysicist who is also the guitarist of the famed rock band Queen.

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