A quick rundown of Tuesday’s what-and-where:

“Countdown to Yuri’s Night”

Yuri’s Night, a yearly celebration of mankind’s ascent into outer space (named for Soviet cosmonaut Yuri Gagarin) takes place around the world every April. And like any space-worthy event, it’s preceded by a countdown: This exhibition at the Artisphere features works by 19 artists, whose visions of space travel, science fiction and the swirling cosmos will get you ready for liftoff. See the exhibition beginning today or attend the opening reception Thursday at 5:30 p.m.

Environmental Film Festival in the Nation’s Capital

Wheter it’s deep-sea drilling, the burning of coal or the construction of wind farms, makind’s energy demands pose immediate and long-term impacts on the Earth. The relationship between energy and the ecosystem is the focus of the Environmental Film Festival in the Nation’s Capital. The 140 (mostly free) offerings include documentaries, animated features and even a Russian psychological thriller. They begin showing on screens across the area today. Visit the festival’s Web site for a complete list of showtimes.

“New Ireland: The Enda Walsh Festival”

The Studio Theatre celebrates one of Ireland’s most prominent contemporary playwrights, hosting and presenting a three-play series of works by Enda Walsh. First up is Druid Theatre Company’s production of “Penelope,” a gritty Irish adaptation of “The Odyssey,” tonight at 7:30 p.m. through April 3. That’s followed by Studio’s own productions of “The Walworth Farce” (April 6-May 1) and “The New Electric Ballroom” (April 13-May 1), the former a farcical family drama; the latter, a rock and roll love story filled with regret. Walsh appears for an in-person conversation after Thursday’s 8 p.m. performance.