Second Wave

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GALAXY HAS ‘BILLIONS OF EARTHS’

Joanie February 15th, 2009

GALAXY HAS ‘BILLIONS OF EARTHS’
BBC News
February 15, 2009

http://news.bbc.co.uk/2/hi/science/nature/7891132.stm

There could be one hundred billion Earth-like planets in our galaxy, a US
conference has heard.

Dr Alan Boss of the Carnegie Institution of Science said many of these
worlds could be inhabited by simple lifeforms.

He was speaking at the annual meeting of the American Association for the
Advancement of Science in Chicago.

So far, telescopes have been able to detect just over 300 planets outside
our Solar System.

Very few of these would be capable of supporting life, however. Most are gas
giants like our Jupiter; and many orbit so close to their parent stars that
any microbes would have to survive roasting temperatures.

But, based on the limited numbers of planets found so far, Dr Boss has
estimated that each Sun-like star has on average one “Earth-like” planet.

This simple calculation means there would be huge numbers capable of
supporting life.

“Not only are they probably habitable but they probably are also going to be
inhabited,” Dr Boss told BBC News. “But I think that most likely the nearby
‘Earths’ are going to be inhabited with things which are perhaps more common
to what Earth was like three or four billion years ago.” That means
bacterial lifeforms.

Dr Boss estimates that Nasa’s Kepler mission, due for launch in March,
should begin finding some of these Earth-like planets within the next few
years.

Recent work at Edinburgh University tried to quantify how many intelligent
civilisations might be out there. The research suggested there could be
thousands of them.

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