NASA's Kepler mission is to find terrestrial planets, in particular those in the habitable zone of their stars where water and possibly life might exist. Among thousands candidates, 156 planets, including three orbiting a binary star system, have been confirmed as of October 2013. It is just a question of time until the first Earth-like planet will be found in a habitable zone.
Considering that planets are not confirmed every day, the widget needs to be updated manually in that it won't drain your battery.
After installation, a splash comes up with instructions and an About button. Note that widgets need to be moved to the home screen; your device manual knows how to. Please appreciate that widgets cannot be moved to external memory card.