... Tonight's Sky . ... Star Atlas . ... Explore deep-sky delights . ... While the Moon and brighter planets show little affect from light pollution, and double and variable stars also punch through pretty well, many deep-sky objects are not so fortunate. ... As a result, broadband light-pollution filters, which suppress the orange-yellow wavelengths where many roadway and building lights concentrate their emissions, can effectively increase contrast between open star clusters and the surrounding sky. ...