... Tonight's Sky . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... milky way . ... Cosmic cloud races toward Milky Way . ... Smith's Cloud is speeding toward the Milky Way at more than half a million miles per hour (870,000 km/h) and will impact the galaxy in less than 40 million years "When it hits, it could set off a tremendous burst of star formation," Lockman said. ... Only registered members of Astronomy.com are allowed to comment on this article. ...