In a study published in the Astrophysical Journal (arXiv.org preprint), a team of astronomers at Cornell University has modeled the locations of the habitable zones for stars of spectral classes F to M and how long exoplanets can stay in them. This graphic shows where a planet can be habitable and warm around our Sun, as it ages over billions of years. Image credit: Cornell University. The habitable zone (HZ) is the region where water could be liquid...
