Astronomy Picture of the Day . Hong Kong Sky . 6.02.2010 . ... It follows a young crescent Moon, with brilliant planet Jupiter to its left, as they set together in the western sky. Their two luminous trails are faintly paralleled by trails of background stars. Dust Storm on Mars . ... This cosmic expanse of dust, gas, and stars covers close to 3 degrees on the sky in the heroic constellation Perseus. ... Mars, on the far upper left, is the brightest object in the above picture. ...