11.   Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult.

12.   Could be any planet, right.

13.   Among questions left unanswered are the origin of the Venusian atmosphere, what the planet was like before it became volcanically quiet and how its towering mountains evolved.

14.   And if there is a planet there, it is likely to be more Earth-like than any of the others discovered.

15.   And such planets could be warm enough to have water in liquid form, which is considered a requirement for chemical processes creating organic molecules associated with life.

16.   And, to the surprise and puzzlement of astronomers, the planet is closer to its parent star than tiny Mercury is to the Sun.

17.   Any object of mass has gravity, but the planets are not large enough or close enough to cause us trouble.

18.   Any such planets are beyond detection by current telescopes.

19.   As happens every November, our planet is about to brush into the dusty trail of Comet Tempel-Tuttle.

20.   As if the entire planet were one big Club Med, full of martinis and masseurs.