Extended Data Fig. 3: PDF of the estimate of the number of supernovae required to power the Local Bubble’s expansion.
From: Star formation near the Sun is driven by expansion of the Local Bubble
![Extended Data Fig. 3](https://cdn.statically.io/img/media.springernature.com/full/springer-static/esm/art%3A10.1038%2Fs41586-021-04286-5/MediaObjects/41586_2021_4286_Fig5_ESM.jpg)
The estimate is obtained by comparing the shell’s present-day momentum to the average momentum injected by supernovae.