LOONBALLOON Alien, Space, Earth Theme Balloons, 22in. BUBBLE – BIRTHDAY OUTER SPACE, 4 Pearl White Latex Set, Accent your space, plant or alien themed party with this long-lasting 22in. Birthday Outer Space plastic Bubble Balloon. The perfect balloon for your space, plant or alien party, this 22in. party balloon is great for setting the scene! This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float. Balloon arrives uninflated.