D passed a Gestational Age Act. It contains this central provision: “Except in a medical emergency or in the case of a severe fetal abnormality, a person shall not intentionally or knowingly perform . . . or induce an abortion of an unborn human being if the probable gestational age of the unborn human being has been determined to be greater than fifteen (15) weeks.” The legislature made a series of factual findings. At the time of enactment, only six countries besides the United States “permitted nontherapeutic or elective abortion-on-demand after the twentieth week of gestation.” It then found that at 5 or 6 weeks’ gestational age an “unborn human being’s heart begins beating”; at 8 weeks the “unborn human being begins to move about in the womb”; at 9 weeks “all basic physiological functions are present”; at 10 weeks “vital organs begin to function,” and “hair, fingernails, and toenails . . . begin to form”; at 11 weeks “an unborn human being’s diaphragm is developing,” and he or she may “move about freely in the womb”; and at 12 weeks the “unborn human being” has “taken on ‘the human form’ in all relevant respects.” It found that most abortions after 15 weeks employ “dilation and evacuation procedures which involve the use of surgical instruments to crush and tear the unborn child,” and it concluded that the “intentional commitment of such acts for nontherapeutic or elective reasons is a barbaric practice, dangerous for the maternal patient, and demeaning to the medical profession.” P is an abortion clinic and one of its doctors. P filed suit in Federal District Court alleging that the Act violated this Court’s precedents establishing a constitutional right to abortion. The District Court granted summary judgment in favor of P because “viability marks the earliest point at which the State’s interest in fetal life is constitutionally adequate to justify a legislative ban on nontherapeutic abortions” and that 15 weeks’ gestational age is “prior to viability.” The Fifth Circuit affirmed. The court granted certiorari.