Want to Colonize an Alien Planet? Send 40,000 People
If humanity ever wants to colonize a planet beyond the solar system, it’s going to need a really big spaceship.
The founding population of aninterstellar colony should consist of 20,000 to 40,000 people, said Cameron Smith, an anthropologist at Portland State University in Oregon. Such a large group would possess a great deal of genetic and demographic diversity, giving the settlement the best chance of survival during the long space voyage and beyond, he explained.
101 Geysers Spotted on Saturn’s Icy Moon Enceladus
The icy Saturn moon Enceladus sports at least 101 geysers, which reach all the way down to the satellite’s subsurface ocean, new research suggests.
Scientists mapped out 101 geysers of water vapor and ice near Enceladus’ south pole after analyzing images captured by NASA’s Cassini spacecraft over a period of nearly seven years. This effort also helped astronomers trace the eruptions to their source, researchers said.