Number of Habitable Exoplanets Found by NASA's Kepler May Not Be So High After All
The tally of potentially habitable alien planets may have to be revised downward a bit. To date, NASA's prolific Kepler space telescope has discovered about 30 roughly Earth-size exoplanets in their host stars' "habitable zone" — the range of orbital distances at which liquid water can likely exist on a world's surface.
Or so researchers had thought. New observations by the European Space Agency's (ESA) Gaia spacecraft suggest that the actual number is probably significantly smaller — perhaps between two and 12, NASA officials said today (Oct. 26)
[...] Gaia's observations suggest that some of the Kepler host stars are brighter and bigger than previously believed, the officials added. Planets orbiting such stars are therefore likely larger and hotter than previously thought.
Also at NASA.
(Score: 4, Informative) by Runaway1956 on Tuesday October 30 2018, @04:02PM (12 children)
We can't even engineer a parasol to shield the earth from part of the sun's emissions. I don't mean to put the earth in darkness - just a parasol or mirror to deflect a small percentage of the energy we absorb. The greenhouse won't heat up, if the excess energy is deflected away, can it? What would it take - a 3% reduction in sunlight? 6%? Just put a mirror up there, and move it closer to the sun to block out more of the sun. Something the size of Delaware, for starters? Or, the size of Texas?
Seriously, if we can't invent and operate a simple window shade, we'll never move moons around.
(Score: 2) by ikanreed on Tuesday October 30 2018, @04:58PM (6 children)
The problem with this strategy, is while it's sufficient to mitigate climate change up to around 350 ppm(given the numbers you provide and some napkin math), it also diminishes, you know, plant and algae growth. Which are big ol carbon sinks. And sources of food. 3-6% less food might be semi-sustainable, but it's a biiiiiiiiiig cost. I'm sure you can further spitball megaengineering solutions to these problems, but I just want to say it's not as easy as just flying into space with a couple million tons of light-weight titanium alloys, and calling it done.
Also, if anything, I have to imagine a sustainable future brings in higher insolation to increase the sustainable energy base.
(Score: 3, Informative) by takyon on Tuesday October 30 2018, @05:03PM (5 children)
https://www.technologyreview.com/s/511016/a-cheap-and-easy-plan-to-stop-global-warming/ [technologyreview.com]
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 2) by ikanreed on Tuesday October 30 2018, @05:12PM (1 child)
Consider me fully informed on the aerosol proposals. "what if we brought back acid rain?" is sure a take on climate change, though.
(Score: 3, Interesting) by takyon on Tuesday October 30 2018, @05:30PM
We currently emit the stuff near the ground. Switch to electric cars, solar, fusion, etc. and inject it into the stratosphere instead. FTA you were fully informed about:
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Tuesday October 30 2018, @05:16PM (2 children)
Ah, I always wondered what the humans in the Matrix world did to "scorch the sky."
(Score: 2) by takyon on Tuesday October 30 2018, @05:34PM (1 child)
Ah, yes. The movie that justified using humans as "batteries" by throwing in "a form of fusion". That even more vague throwaway line should definitely inform our geoengineering efforts.
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Tuesday October 30 2018, @10:44PM
I think it was all explained in the animatrix.
(Score: 2) by takyon on Tuesday October 30 2018, @05:04PM (2 children)
https://www.technologyreview.com/s/511016/a-cheap-and-easy-plan-to-stop-global-warming/ [technologyreview.com]
https://www.technologyreview.com/s/603974/harvard-scientists-moving-ahead-on-plans-for-atmospheric-geoengineering-experiments/ [technologyreview.com]
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 1) by Sulla on Tuesday October 30 2018, @08:44PM (1 child)
So those articles are from 2013 and 2016, has there been any update on the real world test of this using a balloon? I was going to go down the rabbithole of reading the documentation on the Keith Group website but if you already have it would save me some time.
Ceterum censeo Sinae esse delendam
(Score: 2) by takyon on Tuesday October 30 2018, @09:02PM
Planned for Spring to Fall 2019:
https://projects.iq.harvard.edu/keutschgroup/scopex [harvard.edu]
https://www.technologyreview.com/s/611682/how-one-climate-scientist-combats-threats-and-misinformation-from-chemtrail-conspiracists/ [technologyreview.com]
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Tuesday October 30 2018, @08:51PM (1 child)
Or instead of cluttering up outer space even more, make vast tracts of those films that radiate in the "window" of infrared wavelengths that go readily through the atmosphere.
e.g. https://soylentnews.org/article.pl?sid=18/10/28/008223 [soylentnews.org]
e.g. https://soylentnews.org/article.pl?sid=17/09/05/0250247 [soylentnews.org]
(Score: 0) by Anonymous Coward on Tuesday October 30 2018, @08:54PM
...and pave the Earth [archive.org] with the stuff.