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Looking to Exploding Stars for Clues About Life on Ancient Earth

Scientists know that two massive stars exploded about 300 light years from Earth less than 10 million years ago. Both explosions - the first between 8.7 and 6.5 million years ago, and the second about 3 million years later - happened during the age of large mammals - mastodons, ground sloths, bears, and the ancestors of humans. During this time, the Earth was going through major geological and environmental changes. There were even some minor extinctions. Scientists have long wondered if...

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