Once upon a time, science communication was a niche hobby, reserved for the rare few who could translate lab jargon into something the public might understand. Carl Sagan made it look easy, but most ...

With the occasional nod to his greatest achievements, his exploration of the cosmos is at times a challenging, daunting ...

or high concentrations of ammonia gas (as suggested by Sagan) are favored possibilities, or a combination of these effects.