WebMar 17, 2024 · star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye. Many stars occur in pairs, multiple systems, or star clusters. The members of such stellar … WebThe Cambrian Explosion: For most of the nearly 4 billion years that life has existed on Earth, evolution produced little beyond bacteria, plankton, and multi-celled algae. But beginning about 600 ...
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WebThe continental crust contains the historical record of our planet. Its most ancient rocks are four billion years old, and the youngest ones are still forming today. Parts of the continental crust may be older than four billion years, but if so, they are not exposed, or have not been found, on the Earth’s surface. WebNov 1, 2024 · Drag from our natural satellite has gradually slowed the planet’s rotation ever since, increasing day length from about six hours in Earth’s youth to 24 hours today. WebMay 13, 2024 · Earth’s Timeline and History. 4,567,000,000 years ago, Earth was covered in molten lava. Earth was completely unrecognizable. In its earliest stage of formation, it was uninhabitable as it clumped from a cloud of dust. About 1,000,000,000 years ago, Earth had its first signs of life. Single-celled organisms consumed the sun’s energy. how to send bulk sms from excel sheet free