WASHINGTON (Reuters) - A strange and powerful burst of radio waves from near the center of our galaxy may have come from a previously unknown type of space object, U.S. astronomers reported on Wednesday. Other experts nicknamed the mysterious source a "burper" and said there would be a race to scan for similar radio bursts. "We hit the jackpot," said Scott Hyman, a professor of physics at Sweet Briar College in Virginia, who led the study. "An image of the Galactic center, made by collecting radio waves of about 1 meter (3 feet) in wavelength, revealed multiple bursts from the...