135 cardinals from around the world will take their picks on who the new pope should be.
They'll be locked in Rome's Sistine Chapel from tomorrow to decide who will replace Pope Francis.
There's no timescale for how long it'll take, but the last two papal elections lasted for two days.
Australian Catholic Journalist Mark O’Connor told Mike Hosking the cardinals know what they're looking for.
He thinks the cardinals want to have someone with charisma, who can connect with ordinary people.
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