Studying hazy, distant exoplanets for signs of life: This is what happened on Archean Earth
As per a latest report from NASA, Earth’s atmosphere seems to have been quite different then, probably with little available oxygen but high levels of methane, ammonia and other organic chemicals.
Feb 09, 2017, 10:21 AM ISTDiamonds used to "probe" ancient Earth
While the diamonds of this study were found in 3 billion-year-old sedimentary rocks, diamond formation occurred much deeper, within Earth's mantle.
Jan 24, 2016, 15:55 PM IST