Schoolchildren have long remembered the order of the planets from the sun with the mnemonic device My Very Erudite Mitochondria Jocosely Shot Us, Nathan. Discover your own decoding of outer space with today's Groupon: for $10, you get two tickets to "The Universe in a Night" planetarium evening program at the H.R. MacMillan Space Centre (a $22.56 value, including taxes) in Vanier Park. The program is held Saturdays at 7 p.m.

Experience the infinite expanses of the galaxies without dragging the family spacepod out of storage with two tickets ($10.75 each) to "The Universe in a Night." Your tickets include admission for you and a fellow astronomy enthusiast to see a visually surrounding multi-media presentation in the Planetarium Star Theatre. Starting July 3, the planetarium show will be "Quest for Origins." Delve into the birth of stars, the age of the universe, and what came first—the chicken or the asteroid—in 360-degree panoramic glory, as knowledge swirls around you, drowning you in a whirlpool of wonder. Also included in "The Universe in a Night" is admission to the micro-lecture "Hot Topics!," which tackles the latest developments in all things astro. Finally, you'll stop in the observatory for a sky-watching session, where you can play connect-the-dots with the constellations, discovering atmosphere images of spoons, hunters, and South American tapirs on jet-skis.

Call up the Triton to your Neptune and hit the H.R. MacMillan Space Centre for a night of star gazing and cosmos surfing.

This deal is not valid toward the space centre's laser shows.