Planet

An object orbiting a star that is not a brown dwarf but bigger than an asteroid. -

Google:define:planet

Planet is also a flexible feed aggregator. It downloads news feeds published by web sites and aggregates their content together into a single combined feed, latest news first. It uses Mark Pilgrim's Universal Feed Parser to read from RDF, RSS and Atom feeds; and Tomas Styblo's templating engine to output static files in any format you can dream up. Planet requires Python 2.2 or greater installed on your system. It requires only python-bdb, everythingelse is included in the Planet distribution. - http://www.planetplanet.org/

see for example:
 * http://planet.debian.net/
 * http://fossplanet.osdir.com/
 * http://planet.jabber.org/
 * http://planetsecurity.bacarospo.net/
 * http://planet.c3bi.de/
 * http://planet.phinn.de/