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bubble. 1  a nearly spherical body of gas contained in a liquid. 2  a small globule of gas in a thin liquid envelope. 3  a globule of air or gas, or a globular vacuum, contained in a solid. 4  anything that lacks firmness, substance, or permanence; an illusion or delusion.
Imagine a bubble bath where each bubble represents a universe. In this multiversal tub that existed before our Big Bangâand still exists todayâuniverse bubbles are colliding, popping, budding new bubbles, expanding and contracting. If this scenario really exists, âBig Bangs happen all the time,â says Kaku.