More results from the Kepler mission continue to be processed and analyzed, and reports are hitting the mainstream media today about Kepler-22b. This object is about 2.4 times the size of Earth (mass still uncertain), and orbits a slightly cooler star than our own Sun, but at a distance of about 125 million km, resulting in an estimated temperature on its surface of 22C. For non-metric Americans, that’s 71.6 degrees Fahrenheit, folks. Short-sleeve weather.
In terms of confirming that there are worlds out there with Earthlike conditions, this is huge. It’s the closest we’ve come to finding a verifiable garden world like our own, and compared to what we’ve been excited about already, well, this is much, much better. We can be sure we will strain our remote sensing technologies to their limit, for decades and probably centuries, trying to glean more and more information about this object: Is the surface solid? What’s in the atmosphere? Is there water? What about biosignatures?
Too bad it’s 600 light-years away.
Now imagine how exciting this could have been if we had detected an object like this at Tau Ceti, or Sirius, or Alpha Centauri. There are teams working very hard right now to tease out planetary hints from doppler data on the Alpha Centauri A/B binary, but unfortunately, it’s not an easy case. I know of no teams working on other nearby stars – but I’d sure like to hear about such efforts (please comment, if you know of any)!
As great as Kepler-22b is in an abstract sense, our civilization has no serious prospects to reach that place – and it’s a for-real place – for several millenia. Give us some planetary detections, especially a garden world candidate or two, within 15 light-years, and then let’s see about starting a foundation to build us a solar sail probe or a robot orion or something worthwhile.
Meanwhile, I’m afraid terraforming Mars is a lot more practical for now.