How Neptune was predicted from changes in Uranus's orbit

Neptune was inferred from Uranus’s orbit

Neptune’s gravity caused slight but detectable variations in Uranus’s orbit. Those changes showed that an unseen planet could be inferred from the effects it produces on another planet.

The Spanish invaded an Inca Empire already weakened from within

Before the main Spanish attack, the Inca Empire had already suffered a war over who would rule, unrest among recently conquered peoples, and deadly disease outbreaks. Emperor Huayna Capac may have died in one of them. The Spanish therefore attacked an empire that was still powerful but already badly weakened.

Slave-trade profits helped fund Copenhagen buildings

Between 1660 and 1806, Danish merchants—many based in Copenhagen—transported about 120,000 enslaved Africans to the Danish West Indies. Profits from the slave trade helped fund prominent Copenhagen buildings, including Moltke Mansion and the Yellow Palace.

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How Neptune was predicted from changes in Uranus's orbit

Neptune was inferred from Uranus’s orbit

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