NASA's Kepler Mission Discovers Earth's Bigger, Older Cousin
NASA says we're on our way to discovering Earth 2.0.
The
Kepler Space Telescope
has located a planet and star closely resembling Earth and the Sun,
NASA officials said. The newly discovered planet, which NASA has named
Kepler-452b, is believed to be 6 billion years old -- making it about
1.5 million years older than the Earth and our sun. NASA said the star,
Kepler-452, also has the same temperature as our Sun and has a diameter
10 percent larger.
The system is located 1,400 light-years from Earth in the constellation
Cygnus. What makes the discovery especially intriguing is that the
planet is orbiting the habitable zone of the solar system, the
"Goldilocks" region where it's not too hot or too cold, so that the
surface of the planet could sustain liquid water.
"It’s awe-inspiring to consider that this planet has spent 6 billion
years in the habitable zone of its star; longer than Earth," said Jon
Jenkins, Kepler's data analysis lead. "That’s substantial opportunity
for life to arise, should all the necessary ingredients and conditions
for life exist on this planet."
While the planet's mass and composition are still unknown, scientists
have determined the planet is 60 percent larger in diameter than Earth
and has a slightly longer orbit around its star -- clocking in at 385
days.
Kepler began its quest to find Earth-like planets in 2009. Today's
announcements comes as NASA completed an initial analysis of data from
the telescope, which has discovered more than 4,600 planets and planet
candidates. 
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