Now that Earth plans to cut its energy bill by having daylight only on Wednesdays, humanity will need to adapt to endless night if it's to keep owls from stealing all the jobs and delicious mice. Start building up your glow-in-the-dark vision with today's Groupon: for $8, you get two tickets to any cosmic light show at Clark Planetarium (up to a $16 value).

Clark Planetarium's Hansen Dome Theatre, home to the cosmic light show series, launches high-definition, full-color graphics onto a 55-foot domed screen that ensconces astro-enthusiasts in an auditory and pictorial exploration of rock music. Fog machines and LED lighting effects enhance visuals while the theater's 13,000-watt Dolby surround sound system thunders with a concert-quality bass that drifts into aural canals like an aura of pretense drifts into a conversation about the colors of the sunset. The Dark Side of the Moon show lights up Pink Floyd's classic album in a 43-minute production—suggested for ages 8 and up—and Led Zeppelin, the series' newest show, stimulates senses for 40 minutes to archetypal tunes such as Kashmir and Stairway To Heaven. Rock On Demand explores universes for 45 minutes to tunes chosen by the audience from a library of rock music more voluminous than Father Time's coffee mug. Cosmic light shows are scheduled seven days a week.