Using the Titius-Bode relation and Kepler data, astronomers from Australian National University estimate that the standard star has about two planets in the habitable zone.
Planetary scientists have calculated that there are hundreds of billions of Earth-like planets in our galaxy which might support life.
The new research, led by Ph.D. student Tim Bovaird and Associate Professor Charley Lineweaver from The Australian National University (ANU), made the finding by applying a 200-year-old idea to the thousands of exo-planets discovered by the Kepler space telescope.
They found the standard star has about two planets in the so-called Goldilocks zone, the distance from the star where liquid water, crucial for life, can exist.
“The ingredients for life are plentiful, and we now know that habitable environments are plentiful,” said Associate Professor Lineweaver, from the ANU Research School of Astronomy and Astrophysics and the Research School of Earth Sciences.
“However, the universe is not teeming with aliens with human-like intelligence that can build radio telescopes and spaceships. Otherwise, we would have seen or heard from them.
“It could be that there is some other bottleneck for the emergence of life that we haven’t worked out yet. Or intelligent civilizations evolve, but then self-destruct.”
The Kepler space telescope is biased towards seeing planets very close to their stars, that are too hot for liquid water, but the team extrapolated from Kepler’s results using the theory that was used to predict the existence of Uranus.
“We used the Titius-Bode relation and Kepler data to predict the positions of planets that Kepler is unable to see,” Associate Professor Lineweaver said.
The research will be published in Monthly Notices of the Royal Astronomical Society.
Reference: “Using the Inclinations of Kepler Systems to Prioritize New Titius-Bode-Based Exoplanet Predictions” by Timothy Bovaird, Charles H. Lineweaver and Steffen K. Jacobsen, 13 March 2015, MNRAS.