John D. Ruley Latest articles by John D. Ruley Intelligence: A Rare Cosmic Commodity By John D. Ruley published 10 April 08 A model suggests that intelligent life may be very rare in the universe. Astronomy Get the Space.com NewsletterBreaking space news, the latest updates on rocket launches, skywatching events and more!Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors MORE FROM SPACE...1Could time travel tourism be the next space tourism? (op-ed)2Can we protect historical sites on the moon before it's too late?325 years ago, 'Mission to Mars' and 'Red Planet' had a bad Martian movie showdown. Was there a winner?4Jeff Bezos' Blue Origin targeting May 31 for 12th space tourism launch5'This is an attack on NASA.' Space agency's largest union speaks out as DOGE cuts shutter science institute located above 'Seinfeld' diner in NYC
Intelligence: A Rare Cosmic Commodity By John D. Ruley published 10 April 08 A model suggests that intelligent life may be very rare in the universe.
