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

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Do galaxies have clearly defined borders, or do they just kind of bleed into each other?

9839 upvotes

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Is there any kind of an upper limit for how many planets can be in a solar system? I assume that there are plenty of systems with zero, but are there others with hundreds or thousands, or is there some kind of clear maximum?

6593 upvotes

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As we age, do our organs lose transplant value? If they do, are there any with more longevity? Like, a 70 year old heart might not be desirable, but maybe kidneys or something else retain some value despite age?

94 upvotes

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Do any animals apart from humans have an evolving den/nest aesthetic?

37 upvotes

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Do Animals Hesitate Before Entering Cold Water?

27 upvotes

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Do worms (I was thinking earthworms, but nematodes of any kind will work) have a distinct top and bottom?

19 upvotes

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Are nocturnal animals active for longer periods in the winter?

13 upvotes

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Are there any animals that have been observed to provide medical care to another, more sophisticated than licking a wound?

11 upvotes

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How does under-skin become skin?

11 upvotes

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Where/how are antibodies stored in the body?

9 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Do galaxies have clearly defined borders, or do they just kind of bleed into each other?	9839
Is there any kind of an upper limit for how many planets can be in a solar system? I assume that there are plenty of systems with zero, but are there others with hundreds or thousands, or is there some kind of clear maximum?	6593
As we age, do our organs lose transplant value? If they do, are there any with more longevity? Like, a 70 year old heart might not be desirable, but maybe kidneys or something else retain some value despite age?	94
Do any animals apart from humans have an evolving den/nest aesthetic?	37
Do Animals Hesitate Before Entering Cold Water?	27
Do worms (I was thinking earthworms, but nematodes of any kind will work) have a distinct top and bottom?	19
Are nocturnal animals active for longer periods in the winter?	13
Are there any animals that have been observed to provide medical care to another, more sophisticated than licking a wound?	11
How does under-skin become skin?	11
Where/how are antibodies stored in the body?	9