The "Local Bubble" was probably created by:

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The "Local Bubble" is thought to have been created by a nearby supernova that occurred about 300,000 years ago. This supernova would have been much brighter than the full Moon and would have created a shock wave that blew away interstellar material, creating a void in space that we now call the Local Bubble. The Local Bubble is thought to have been created by a nearby supernova that occurred approximately 300,000 years ago. This supernova would have been brighter than a full Moon and would have blown a bubble of gas and dust out into the surrounding interstellar medium. The Local Bubble is a region of low-density hot gas and is located within the Orion Arm of the Milky Way.

The "Local Bubble" Was Probably Created By