A Cloudy Mystery

This image, taken with NASA's Spitzer infrared space telescope, shows the mysterious galactic cloud, seen as the black object on the left. The galactic center is the bright spot on the right. The Spitzer image of the cloud (left). The SMA image (center) shows the relative lack of dense cores of gas that are thought to form stars. The CARMA image (right) shows the presence of silicon monoxide, which suggests the cloud might be the result of two colliding clouds. ( full image ) -It's the mystery of the curiously dense cloud. And astronomers at the California Institute of Technology (Caltech) are on the case.
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