Share this on WhatsApp The Oort cloud, postulated in 1950 by the Dutch astronomer Jan Oort, defines the periphery of the solar system—extending out beyond 100,000 times the Earth-sun separation. It contains billions of icy rocks larger than Manhattan Island, as bricks left over from the construction process of the solar system’s planets. The Oort … Continue reading Was the Interstellar Object ‘Oumuamua a Nitrogen Iceberg?