The Technological Zone is Closer to Stars Than Superhabitable Exoplanets

(Image credit: Greg Wyatt)If you live in a house, one out of billions of other houses on your street, it is most likely that you do not have the best living conditions. This logic should apply to habitable worlds around stars in our cosmic neighborhood.(Image credit: Greg Wyatt)The class of exoplanets more conducive to life than Earth, are labeled superhabitable worlds. They offer ideal vacation destinations for interstellar travel agencies. If we ever meet aliens from superhabitable planets, they can tell us all about the paradise exoplanets on which they were born. This will likely make us jealous but should not catch us by surprise.(Image credit: Greg Wyatt)Is there a better host star than our Sun?OBAFGKM is the Harvard spectral classification system used by astronomers to categorize stars by their surface temperature, moving from hottest (O) to coolest (M). This system was developed at the turn of the 20th century by pioneering Harvard astronomers, including Annie Jump Cannon and Williamina Fleming. They reordered an earlier, confusing alphabetical system based on hydrogen line strength into a smooth sequence reflecting effective surface temperature. A popular, classic mnemonic used to remember the sequence is “Oh, Be A Fine Girl/Guy, Kiss Me”.(Image credit: Greg Wyatt)The Sun is a main sequence G-dwarf star. Orange K-dwarf stars are cooler, smaller and dimmer than our yellow Sun and their slow burning allows them to shine for 50–100 billion years. Yet lower-mass stars, named M-dwarfs, have powerful flares that can sporadically sterilize Earth-size planets in the so-called Habitable Zone where liquid water may exist on a planetary surface. The longevity of K-dwarfs, along with their relatively stable radiation output, provides a more benign environment for planets to develop and sustain atmospheres on geological timescales.(Image credit: Greg Wyatt)K-dwarfs have surface temperatures between 3700 and 5,200 degrees Kelvin compared to the Sun’s 5,772 degrees, and l