All Earths water
If all Earth's liquid water was put into a sphere it would be about 1,385 kilometers in diameter.
Extent of Human Radio Broadcasts / The Tiny Humanity Bubble
Mankind has been broadcasting radio waves into deep space for about a hundred years now — since the days of Marconi.
That, of course, means there is an ever-expanding bubble announcing Humanity’s presence to anyone listening in the Milky Way. This bubble is astronomically large (literally), and currently spans approximately 200 light years across. But how big is this, really, compared to the size of the Galaxy in which we live (which is, itself, just one of countless billions of galaxies in the observable universe)?
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