June 8: World Oceans Day. “Wear Blue and Tell Two” about ocean conservation efforts today — or pitch in at a beach cleanup.
June 8-15: Grand Canyon Star Party. See Saturn, star clusters and nebulae by night, and Mercury by day, with relative freedom from light and air pollution.
June 15-16: Star Wars Days at Legoland Billund (Denmark). Legos + Star Wars. What more do you need?
June 18: Sally Ride Day/Free Rocket Day. Launch your own rocket as Cleveland’s International Women’s Air and Space Museum honors the 30th anniversary of Sally Ride’s space flight.
June 21: It’s summer solstice. Got bonfire?
June 30: On this date in 1908, more than a century before Russians captured February’s meteor on their smartphones, eyewitnesses near Tunguska saw a sky “split in two” and “covered with fire” when an asteroid detonated over Siberia.