Public tours of the LIGO Hanford Observatory are Sept. 12 and 25.
Times are from 1:30 to 3:30 p.m. Sept. 12 and from 3 to 5 p.m. Sept. 25.
The observatory is west of Richland on Horn Road.The tours are free and open to all ages. Participants should wear comfortable shoes and seasonal clothes. The observatory is wheelchair accessible.