For fifty years, the Search for Extra Terrestrial Intelligence has been scanning the galaxy for a message from an alien civilisation. So far to no avail, but a recent breakthrough suggests they may one day succeed. Horizon joins the planet hunters who've discovered a new world called Gliese 581 c. It is the most Earth-like planet yet found ...

Exciting news about Saturn's moons and distant galaxies, future missions to Earth's moon and promising findings about hurricanes on Earth were just a few of the developments in 2007.