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, US astronomers reported. 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 source during a seven-hour period from Sept. 30 to Oct. 1, 2002 -- five bursts in fact, and repeating at remarkably constant intervals."