Neptune's windy atmosphere in August 1989. The ice giant Neptune was the first planet located through mathematical predictions rather than through regular observations of the sky.
well slavery was an big issue because it separated the northern and southern states. the northern states realize that slavery was an unnessary inhumane treatment and wanted to abolished it. While the southern states depended on slaves since they worked for free on their plantation. To resolve this they counted 3 free men for 5 slaves until 1808.
The debate over slavery in the United States did not begin with the Constitutinal Convention (1787), but it was here that the issue first came to the fore. Some northern delegates were opposed to it. Southern delegates were committed to it.