/u/ijflwe42's posts in /r/askscience

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Is there an evolutionary reason that aquatic reptiles (such as ichtyosaurs) moved their tails horizontally, while aquatic mammals move their tails vertically?

508 upvotes

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Would a planet-sized ball of liquid water in space have a solid core of "hot ice" the same way Earth's inner core is solid?

152 upvotes

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Are there any estimates for the coldest and hottest it has ever been (naturally) on Earth at any time in its history?

27 upvotes

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When the universe enters heat death, what will the average temperature of the universe be? Will it be absolute zero?

10 upvotes

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Has there ever been a documented case of a bacteria or protist that has gone extinct?

4 upvotes

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Assuming the theory that comets delivered water to Earth is true, why aren't Mars, Venus, and Mercury also full of water?

2 upvotes

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Can someone feel hungry without a stomach?

1 upvotes

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Could a hydrogen airship be safely built and operated today?

1 upvotes

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Could a cut be healed without scarring by using stem cells?

1 upvotes

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Non-metal substances, such as hydrogen, can become metallic under extreme heat and pressure. Can metals become non-metal under certain circumstances, even purely theoretical ones?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Is there an evolutionary reason that aquatic reptiles (such as ichtyosaurs) moved their tails horizontally, while aquatic mammals move their tails vertically?	508
Would a planet-sized ball of liquid water in space have a solid core of "hot ice" the same way Earth's inner core is solid?	152
Are there any estimates for the coldest and hottest it has ever been (naturally) on Earth at any time in its history?	27
When the universe enters heat death, what will the average temperature of the universe be? Will it be absolute zero?	10
Has there ever been a documented case of a bacteria or protist that has gone extinct?	4
Assuming the theory that comets delivered water to Earth is true, why aren't Mars, Venus, and Mercury also full of water?	2
Can someone feel hungry without a stomach?	1
Could a hydrogen airship be safely built and operated today?	1
Could a cut be healed without scarring by using stem cells?	1
Non-metal substances, such as hydrogen, can become metallic under extreme heat and pressure. Can metals become non-metal under certain circumstances, even purely theoretical ones?	1