Finding the perfect home away from home isn’t always easy. Remember that “chic rustic” holiday home that turned out to be a rusty shed? Yes, the location was great, but cockroaches can be a real mood killer. So with all the new earth like planets popping up, we’re spoiled for choice when it comes to finding a new home. Or are we? Here’s a barplot of key parameters from all known habitable planets as of Feb 22, 2017.

Barplot of key parameters for all known habitable planets as of 22 Feb, 2017


When it comes to planets, the word “habitable” can have a rather broad definition. We see from the barplot that most “habitable” planets show some big differences from Earth.


Hierarchical clustering is a handy way to visualize relationships and clusters in data. In the plot below, hierarchical clustering is applies to the parameters of known habitable worlds so that we can see what clusters with earth. And the bad news is – still not much, even with TRAPPIST-1 included.


hierarchical clustering of parameters from habitable worlds

Heatmap of key planets from known habitable worlds, including the TRAPPIST-1 system

The scale is Log2 – so a difference of 1 corresponds to a 2-fold change. Temperatures  don’t show up well compared with the other parameters, although the clustering algorithm still takes them into account.


Coming soon: tutorial on how to generate heatmaps like this, using exoplanet data for fun!