Earth formation
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Khan AcademySal Khan
Earth formation
Earth was formed approximately 4.6 billion years ago, likely as the result of a supernova (star explosion). The debris from this explosion began to collapse in on itself due to gravity, forming the sun. Gravity continued to draw the remaining particles together, clumping them into larger bodies, ultimately forming Earth and the other planets in ...
2011年2月20日
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Did Life Really Begin in Space?" What if I told you… life didn’t start on Earth at all? 🌍⚡ 4 billion years ago, our planet was just fire, gas, and chaos — until one lightning strike changed everything. ⚡ That single spark created the first building blocks of life itself. But here’s the twist — scientists believe those chemicals may have come from space, riding on meteorites and comets! ☄️ So the real question is… if life began in space, could it already exist somewhere else? 👽💫 #ScienceMyster
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