There may well bemore than 60 billion habitable planetslittering the Milky Way , but it ’s virtually unacceptable to make use of that name . or else , how aboutthis picture , which shows you how many planets are within 60 light - years of Earth .
https://gizmodo.com/there-are-60-billion-habitable-planets-littering-the-mi-645012671
In the picture , the sizing of the circle represents the size of the satellite , while colouration indicates the variety of star it orbits : swarthy ruddy signifies that it ’s spinning around something similar to the Sun , gray means that the star is a dissimilar size . Dark circles defend planets the same size of it as Earth .
While it does n’t quite match the 60 billion total of the Milky Way , it ’s deserving remembering that our extragalactic nebula happens to be a massive 100,000 light - years across , while this show planets within 60 . In other word , distance that — given the right engineering — might one day be possible to travel . More compelling grounds , if it were required , that we ’re probably not alone . [ XKCD ]
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