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EXO WORLDS
Scientists predict earth-like planets around most stars
by Staff Writers
Canberra, Australia (SPX) Feb 06, 2015


This is the Goldilocks zone, where liquid water can exist. Image courtesy Aditya Chopra, ANU, adapted from NASA/JPL.

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 PhD 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 space ships. 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 civilisations 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.

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EXO WORLDS
"Vulcan Planets" - Inside-Out Formation of Super-Earths
Evanston IL (SPX) Feb 04, 2015
NASA's Kepler telescope has discovered many strange, new worlds. None are stranger than the planetary systems that are commonly seen orbiting very close to their host star. These planets are typically Earth to "super-Earth"-size. Some of these planets are almost 100 times closer to their star than the Earth is to the Sun, and many of these orbits are much smaller than those of Mercury. The ... read more


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