So, belatedly, I'm catching up now.
 
In Search of Earth 2.0
 
Nov. 23, 2015: NASA's Kepler spacecraft is a prolific hunter of planets
outside of our Solar System.  Since it launched in 2009, Kepler has confirmed
more than 1000 of these exoplanets and catalogued thousands of more
candidates.  The menagerie includes planets with densities greater than iron
and lower than Styrofoam; planets smaller than Mercury and bigger than
Jupiter; planets with one sun, two suns, and even four suns!
 
The number and variety of exoplanets is exhilarating to researchers, but in
some ways, the collection leaves something to be desired.  Lay people and
scientists alike share a longing to find one particular type of world-a world
like Earth-that speaks to us in a way that "hot Jupiters" and multiple star
systems cannot.
 
We long for a world whose very existence cries "We are not alone."
 
Kepler has just found the closest analog to the Earth-Sun system.
 
Astronomers have long hoped to find another planet in the cosmos similar to
Earth--a blue dot in the distance that could harbor life akin to our own.
NASA's Kepler spacecraft may have found the next best thing.
 
http://tinyurl.com/hglmop8
 
In July 2015, NASA announced the discovery of Kepler-452b, an exoplanet a
little over 1« times wider than Earth orbiting a G2-type star similar to our
own Sun.  Moreover, Kepler-452b's orbit is located in the "Goldilocks Zone" of
its star system where the temperature is just right for liquid water to
exist.  This is also known as the "habitable zone" because water is required
for life as we know it.
 
"We can think of Kepler-452b as an older, bigger cousin to Earth," says Jon
Jenkins of NASA's Ames Research Center, who led the team that discovered
Kepler-452b. "It's awe-inspiring to consider that this planet has spent 6
billion years in the habitable zone of its star-longer than Earth. That's
substantial opportunity for life to arise should all the necessary ingredients
and conditions for life exist on this planet."
 
Kepler-452b isn't the first exoplanet found in a habitable zone. Indeed, about
a dozen such worlds in this size range have been discovered so far -- that is,
10 to 15 planets between one-half and twice the diameter of Earth, depending
on how the habitable zone is defined and allowing for uncertainties in
measured planetary sizes.
 
Among those dozen, Kepler-452b fires the imagination most because it is the
closest analog to the Earth-sun system discovered to date: a planet only a
little over one-and-a-half times the diameter of Earth orbiting within the
habitable zone of a star very much like our own Sun.
 
A year on Kepler-452b is 385 days long, only a few weeks longer than a year on
Earth. The planet is only 5 percent farther from its parent star than Earth is
from the Sun.  This extra distance is mitigated by extra sunlight.
Kepler-452b's parent star is 20 percent brighter and has a diameter 10 percent
larger than the Sun. The similarities are remarkable, indeed.
 
Says John Grunsfeld, Associate Administrator of NASA's Science Mission
Directorate at the agency's headquarters in Washington, DC. "This exciting
result brings us one step closer to finding an Earth 2.0."
 
Kepler-452b whispers the possibility, that we are not alone.  How much longer
before a new discovery shouts it out?
 
For updates from the planet hunt, stay tuned to science.nasa.gov
 
 
Regards,
 
Roger

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 * Origin: NCS BBS - Houma, LoUiSiAna (1:3828/7)