In his first "Urbi et Orbi" (to the city and the world) message, Francis also called for peace between Israelis and Palestinians, an end to the civil war in Syria, and political solutions to conflicts in several African countries.
The former Cardinal Jorge Bergoglio of Argentina also condemned the "iniquitous exploitation of natural resources" and urged everyone to be "guardians" of creation.
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The scan of the object will begin on Wednesday, with astronomers using four different radio frequency bands. It will last around 10 hours.
Wednesday will be cloudy with more breezy and wet weather for many of us.
They met the stars of the new Star Wars movie at the Royal Albert Hall in London, arriving on the red carpet to be greeted by robot BB-8.