We narrowed the list by considering only candidates that received a better than average reliability rating from Consumer Reports, a top safety rating from the Insurance Institute for Highway Safety, a score of at least four out of fivestars from J.
Though some reviewers have critiqued the app for being overly basic, Stevens notes that the majority of users have rated the app five out of fivestars on the App Store.
In the second decade of this century, Esa plans to launch the Darwin flotilla - a fleet of four or five spacecraft that will hunt for Earth-like planets around other stars and analyse their atmospheres for signs of extra-terrestrial life.