* Astronomy

A mysterious "boom" that resounded across Vancouver early Friday may have been an extraterrestrial wakeup call, theorizes a geophysicist with the U.S. Geological Survey in Vancouver.

"I can't think of any other explanation, other than a fairly substantial gravel quarry explosion" - Jeff Wynn, research geophysicist with the Cascades Volcano Observatory.

Local gravel quarries reported no activity, especially at 6 a.m.

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