Space research reveals possibility of more Earth-like planets
There could be hundreds of billions of Earth-like planets in our galaxy which might support life, according to new research.
A team at the Australian National University in Canberra analysed the figures from the Kepler space telescope to predict the number of planets which could be orbiting stars in an area dubbed the "Goldilocks zone".
These planets are thought to be far enough away from stars for liquid water to survive in the atmosphere to encourage life.
Associate Professor Charley Lineweaver and PhD student Tim Bovaird applied a 200-year-old idea to the thousands of exoplanets spotted in the sky to determine the number of suitable planets.
"We looked at the sub-set of stars that have multiple planets, not just one or two, and among those we looked for specific pattern called the Titius-Bode relation and we found that these exoplanet systems fit the relation better than our solar system does," he said.
"So based on that we made predictions about where other planets would be if this pattern can be successfully extrapolated beyond what is normally seen."
The revelation that many more planets than previously thought could contain life sent a shockwave through the astronomy community.
"It's not just a rare occurrence, and it is not just in our galaxy," Associate Professor Lineweaver said.
"Essentially our result says almost every single star will have a planet or two in the habitable zone around it.
"The problem is our techniques to detect planets have very strong biases against being able to find planets in the habitable zone and that's why this new technique, which is really an ancient technique that we have modified, is necessary to make this type of claim."
Associate Professor Lineweaver stressed these Earth-like planets had not been detected, but his team developed the theory to help identify possible sites.
He said the lack of confirmed signs of life or aliens from other planets could be because it is harder for life to emerge than believed.
"One theory is the emergence of life is just a rare event, another could be that once you develop life and it becomes intelligent then you kill yourself, its called a self-destruction bottleneck.
"Or that human-like intelligence is a rare thing, and it could all be viral or bacterial life, and it doesn't evolve towards technological intelligence."
The research will be published in the journal Monthly Notices of the Royal Astronomical Society.
