A launch vehicle program costs almost as much to maintain as a force in being without doing anything as it does to conduct active flight operations. (marssociety.org)
«[This is] the strongest evidence for active flight in Archaeopteryx that has been brought forward in the last 150 years,» Voeten says. (sciencemag.org)
«Their results convincingly show that it could do active flight» once it was already airborne, Mayr says. (sciencenews.org)