Sustainability, astrobiology illuminate future of life in the universe and civilization on Earth |

Two astrophysicists show how habitability studies of exoplanets hold important lessons for sustaining the civilization we have developed on Earth. This “astrobiological perspective” casts sustainability as a place-specific subset of habitability, or a planet’s ability to support life. While sustainability is concerned with a particular form of life on a particular planet, astrobiology asks the bigger question: what about any form of life, on any planet, at any time? “If they use energy to produce work, they’re generating entropy. And that entropy will almost certainly have strong feedback effects on their planet’s habitability, as we are already beginning to see here on Earth.”

Read more at:

This is a schematic of two classes of trajectories in SWEIT solution space. Red line shows a trajectory representing population collapse whereby development of energy harvesting technologies allows for rapid population growth which then drives increases in planetary forcing. As planetary support systems change state the SWEIT population is unable to maintain its own internal systems and collapses. Blue line shows a trajectory representing sustainability in which population levels and energy use approach levels that do not push planetary systems into unfavorable states.

Is there any place in the Universe where there's truly nothing?

What are the properties of nothing?
Even in the gulfs of intergalactic space, there are hundreds or thousands of particles in every cubic meter. But even if you could rent MegaMaid from a Dark Helmet surplus store, and vacuum up those particles, there would still be wavelengths of radiation, stretching across vast distances of space.
There's the inevitable reach of gravity stretching across the entire Universe. There's the weak magnetic field from a distant quasar. It's infinitesimally weak, but it's not nothing. It's still something.
Read More: