Is Mark 16:9-20 Authentic?

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Some modern translations, including the New International Version, include the following note after Mark 16:8: “The earliest manuscripts and some other ancient witnesses do not have verses 9–20.” A similar insertion is found at the end of John 7. It reads, “The earliest manuscripts and many other ancient witnesses do not have John 7:53—8:11. A few manuscripts include these verses, wholly or in part, after John 7:36, John 21:25, Luke 21:38 or Luke 24:53.” Considering this, should Mark 16:9-20 ...