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  • Matt Williams at Universe Today notes a paper suggesting that, to have adequate amounts of biomass for a complex biosphere, Earth-like exoplanets would need a good balance between continents and oceans.

  • Matt Williams at Universe Today notes a proposal that, when searching for living worlds, astronomers should search for purple worlds, marked by the pigments of the retinal-based photosynthesis that may have predominated on the early Earth.

  • This Universe Today report on the mysterious collision producing the strange stellar object CK Vulpeculae does a great job of outlining a galactic mystery.

  • This report about a proposal by scientists at MIT to create a laser beacon that would signal our existence to extraterrestrial civilizations looking at our sun intrigues, and alarms, me.

  • James Nicoll at Tor notes speculation that strange extrasolar object 'Oumuamua might be an errant alien artifact. What would that indicate about the galaxy?

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