/u/cbt711's posts in /r/askscience

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If we assume Mars, Earth, Venus all spun off the sun and have relatively similar compositions and the Sun has slowly cooled and will continue to slowly cool over time, can we look at Mars as Earth's future? And Venus as Earth's past? Are these assumptions incorrect?

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If Lithium Sulfur batteries have more power density than LI, and Aluminum ion have more power density, and lithium air have more density (nanopolymer coated sponge configuration) then shouldn't we be aiming for Aluminum Sulfur (+graphene oxide) air batteries?

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If all of the Asteroid belt between Mars and Jupiter was once a planet, how big would it have been based on the total mass of the belt?

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What are the theories for why the Earth 23.5 degrees off axis from its orbit around the Sun?

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Have any medical breakthroughs come from Engineers and not Medical professionals?

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Why are elbows and knees the driest part of human skin?

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Mars is opposite the sun tonight, is it possible at any time in history that Earth’s shadow has been or will be cast on Mars?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If we assume Mars, Earth, Venus all spun off the sun and have relatively similar compositions and the Sun has slowly cooled and will continue to slowly cool over time, can we look at Mars as Earth's future? And Venus as Earth's past? Are these assumptions incorrect?	1
If Lithium Sulfur batteries have more power density than LI, and Aluminum ion have more power density, and lithium air have more density (nanopolymer coated sponge configuration) then shouldn't we be aiming for Aluminum Sulfur (+graphene oxide) air batteries?	1
If all of the Asteroid belt between Mars and Jupiter was once a planet, how big would it have been based on the total mass of the belt?	1
What are the theories for why the Earth 23.5 degrees off axis from its orbit around the Sun?	1
Have any medical breakthroughs come from Engineers and not Medical professionals?	1
Why are elbows and knees the driest part of human skin?	1
Mars is opposite the sun tonight, is it possible at any time in history that Earth’s shadow has been or will be cast on Mars?	1