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A groundbreaking theory suggests that dark matter—the invisible material shaping galaxies—may have formed before the Big Bang ...

The man thought it was the sound of a low flying helicopter before he heard "a huge crash noise," his brother, who arrived at ...

A new idea about cosmic expansion has emerged that might remove the need for dark matter and dark energy altogether.

A herd of African elephants instinctively formed an "alert circle" to protect the younger elephants at the San Diego Zoo ...