GENERAL KNOWLEDGE

Detailed explanation-1: -New York, Feb 13 (IANS) It was 4.6 billion years ago when an enormous cloud of hydrogen gas and dust collapsed under its own weight, eventually flattening into a disk to form the solar nebula, new research has found.

Detailed explanation-2: -The Earth formed over 4.6 billion years ago out of a mixture of dust and gas around the young sun. It grew larger thanks to countless collisions between dust particles, asteroids, and other growing planets, including one last giant impact that threw enough rock, gas, and dust into space to form the moon.

Detailed explanation-3: -When Earth formed 4.6 billion years ago from a hot mix of gases and solids, it had almost no atmosphere. The surface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere.

Detailed explanation-4: -About 4.6 billion years ago, this gigantic cloud was transformed into our Sun. The processes that followed gave rise to the solar system, complete with eight planets, 181 moons, and countless asteroids. Researcher Tim Gregory explains how it burst into being.