To date, of the roughly 800 planets catalogued beyond our Solar System, only four are known to orbit stars in a cluster.

BBC: 'Dirty' stars hint at Sun's future

Weather of a slightly more familiar kind is thought to exist on Titan, the largest satellite of Saturn and the only moon in the solar system to have a thick atmosphere.

ECONOMIST: Comparative meteorology

Prof Solomon said that what Messenger finds not only unlocks secrets about the innermost planet in our Solar System, but could also shed light on those of other planets.

BBC: Mercury's water ice at north pole finally proven

The stakes have just been raised a notch: Not only is there another planet right next door in our own solar system that had habitable environments on its surface long ago, but there appear to have been common and recognizable -- perhaps even Earthlike -- environments on Mars.

CNN: Have a drink on Mars

This will be a long ride to Baton Rouge -- only 80 miles away -- but might as well be half a solar system tonight.

CNN: Miles O'Brien's hurricane blog

But comets were really only unpredictable to ancient peoples, who lacked a knowledge of the full extent of the solar system.

FORBES: Magazine Article

Customers (in this case the school district) pay no money up-front, paying only for the solar energy they use and typically seeing reductions on their utility bills as soon as the system is connected to the grid.

FORBES: Could Solar Save Education?