Seven earth-sized planets discovered circling a star 39 light years from Earth

Re:Seven earth-sized planets discovered circling a star 39 l... by semaphoreP on Wednesday February 22, 2017 @03:04PM (#13708704)

Don't know the number off the top of my head, but it should be considerably less. It should also be highly varying as some galaxies live in pretty densely packed environments (galaxy clusters), which some live in very open environments like our own galaxy.

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Re:Seven earth-sized planets discovered circling a star 39 l... by infogulch on Monday February 27, 2017 @11:04AM (#13745175)

Nothing like a little "look it up yo damn self": Looks like it's about 1 hydrogen per m^3 [1] (via SO [2]), about 1 million times less dense. Damn.

  [1]: http://www.universetoday.com/30280/intergalactic-space/
  [2]: http://physics.stackexchange.com/questions/25378/how-vacuous-is-intergalactic-space/25379#25379

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