70 years ago today, Pope Pius XII solemnly defined the Dogma of the Assumption of Mary into Heaven:
[B]y the authority of our Lord Jesus Christ, of the Blessed Apostles Peter and Paul, and by our own authority, we pronounce, declare, and define it to be a divinely revealed dogma: that the Immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory.
Hence if anyone, which God forbid, should dare willfully to deny or to call into doubt that which we have defined, let him know that he has fallen away completely from the divine and Catholic Faith.
(Munificentissimus Deus, n. 44-45)
Mary, assumed body and soul into Heaven, pray for us and help us attain heavenly glory!