Celebrate science on AstroDay

HOLLYN JOHNSON/Tribune-Herald file photo Colten Endrina-Range, 8, tries on a prop helmet from the movie “The Martian” at the HI-SEAS booth April 30, 2016, during AstroDay at Prince Kuhio Plaza in Hilo.

The 18th Annual AstroDay will be held 10 a.m. to 4 p.m. Saturday, May 4, at Hilo’s Prince Kuhio Plaza. The event is free.