Scientists discover a ‘cousin’ to Earth
Kepler-452b. What makes this planet remarkable is that it orbits its star at about the same distance that Earth orbits the sun. What’s more, its home star looks to be similar to our sun. Based on what scientists know today, Jenkins noted it’s the nearest thing to another Earth-sun twin system.
“Today the Earth is a little less lonely because there’s a new kid on the block,” Jenkins said during a news conference.
He led the team that discovered Kepler-452b.
The last Kepler discovery that had scientists gushing was just over a year ago. That close-to-Earth-size planet, Kepler-186f, was also in the habitable zone of its star. But that faint dwarf star was unlike our sun.
John Grunsfeld, NASA’s science mission chief, emphasised that the exoplanet system identified on Thursday - “a pretty good close cousin to the Earth and our sun” – is the closest so far.
“And I really emphasise the ‘so far’,” he said.
The planet-hunting Kepler will keep churning out new discoveries, Grunsfeld noted, and possibly find even better matches for “Earth 2.0”.
Kepler was launched in 2009 and has nearly 5000 potential exoplanets to its credit – worlds beyond our solar system. It is helping to address such fundamental questions as where do we come from and where are we headed, and arguably the biggest question of all: are we alone in the universe?
Grunsfeld said that thanks to Kepler’s latest finding, we’re taking “one small step in answering that question today”.
While scientists are uncertain whether Planet 452b is rocky like Earth, they believe