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Elon Musk on reusable heat shields and Mars reentry:
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Elon Musk on reusable heat shields and Mars reentry:
— No one has created a truly reusable orbital heat shield before
— Reentry involves extreme heat and pressure — very hard to withstand
— Only advanced ceramics and carbon-based materials can survive it
— SpaceX aims to make
btc
(
twitter.com)
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Gentle dog waits at bus stop for little girl to get onto the school bus safely
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Gentle dog waits at bus stop for little girl to get onto the school bus safely
Gordon, the English Mastiff, seemed to be very protective of this little girl. He stood at the bus stop with her and waited for the bus to arrive. When the girl hopped onto the bus safely, the dog…
有趣
(
twitter.com)
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