Science: Glass from the Lost Planet

Tektites are bits of semitransparent glassy stuff, mostly black or dark green, found in many parts of the world. They cannot be explained as earthly minerals, so most scientists who have studied them believe that they come from space. In The Scientific Monthly, Physicist Ralph Stair of the National Bureau of Standards tells how he thinks they were formed and how they got scattered so widely.

Ordinary meteorites are believed to be bits of a "lost planet" that revolved in an orbit between Mars and Jupiter. For some reason, it broke up and filled the solar system with large and small...

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