Wow, sharks @439mya, Polaris @70mya. They're more than 6 times older! This is NUTS!
What's even crazier is sharks are even older than trees!
Interestingly, Sharks became a thing around the same time that massive fungi structures that looked like trees existed.
Honestly, I disagree. It is much more surprising to me that lifeforms I recognize are older than stars. They're different timescales in my mind that I never even considered comparing.
That's way back. What else was around in the oceans back then? Bony fish? Crabs? My octobuddies?
Queen Elizabeth
And they're gonna go away because some wingnut convinced a bunch of people that their fins cause boners.
A family member once had to resort to traditional chinese medicine so solve an issue - and it acctually worked, I will admit upfront - but I kept hearing how shark cartilage capsules was the best to reinforce joints and one day I just snapped and replied along the lines of "by that same logic, to obtain insulin we should be grinding pig pancreas into pills for insulin".
we used to use cow pancreas to get insulin actually. fortunately bioreactors exist and some clever people figured out how to gmo bacteria to make insulin
Oh is THAT what that's about
Is a species being poached to extinction? If so, it's probably because there's some sort of fertility/virility "medicine" derived from it that Asian men will pay insane money for. -tiger -rhino -civet -pangolon -shark
I'm sexually attracted to shark fins, so they certainly cause boners for me.
And then you add the fact that sharks have barely evolved because they've been the perfect silent killer since the dawn of time.
Another fun fact:
Sharks don't make sound. They don't have any organ for the purpose of making sound. That is creepy as all hell.Just because they didn't change their appearance doesnt mean they did not evolve. It is somewhat misleading to say that, but conveys a point I guess.
More relevantly, the fossil records for sharks are mostly their teeth and jaws, because all their other bones are cartilage and rarely fossilize.
"Sharks haven't significantly evolved in appearance in 350 million years" is therefore based on reconstructions made under the assumption that the old sharks mostly looked like current sharks, which may or may not be true.
Though we can get a surprising amount of information that way, for example one change is that their jaws used be more at the end of their snout instead of more underslung like today, like so:
You'll note the Goblin Shark still has hints of that design.
Do any fish?
Yes, actually. Example: Triglidae
They are bottom-dwelling fish, living down to 200 m (660 ft), although they can be found in much shallower water. Most species are around 30 to 40 cm (12 to 16 in) in length. They have an unusually solid skull, and many species also possess armored plates on their bodies. Another distinctive feature is the presence of a "drumming muscle" that makes sounds by beating against the swim bladder
It is partly true. Polaris is in fact a triple star system. The youngest of the three stars (Polaris Aa) is indeed younger than sharks at between 45 and 67My old. It is in tight orbit with Polaris Ab which is 500My old, and Polaris B which is 1.5By old and a little bit farther away. Here’s a pic from Hubble:
https://en.m.wikipedia.org/wiki/File:Polaris_alpha_ursae_minoris.jpg
I feel cheated that the north star is in fact 3 stars.
Happens a lot. Sometimes a "star" is actually a whole galaxy.
I think it’s also worth mentioning that Polaris Aa, the youngest star in the triplet, is also the brightest by 3 orders of magnitude. Without Polaris Aa, we wouldn’t actually consider it as the North Star at all…so I think you are safe to continue using this as a fact.
Go blow some people’s minds, everyone!
I want to know how three stars can form as a system at very different times. Shouldn't they have similar ages?
My understanding is that, on a cosmic scale, these timeframes are not tremendously different!
Sharks watching stars come and go: strange fireflies...
I always thought they were gigantic balls of gas burning millions of miles away
Pumbaa, with you, everything's gas.
People forget that life on earth has been around for an extremely long time. We believe that single cellular life first appeared around 3.5 billion years ago. We also believe that the universe is around 13.8 billion years old. That means life has been around and evolving for around 25% of the time the universe has existed. Life operates on a scale far beyond our comprehension.
Another fun fact about life. We think that multicellular life only appeared around 600 million to 1.2 billion years ago. So life was probably single cellular for billions of years. The complexity of life has rapidly increased since then and will continue to do so.
Edit: new research suggests that complex multicellular life may have appeared around 2.4 billion years ago.
and will continue to do so.
Humans: hold my beer.
Life will always be there. We just wouldn't be involved.
Age 45 - 67 Myr. (Source: Wikipedia).
Holy shit, by a lot.
It’s just a widdle baby star.
Fuck that's a cool fact.
I know right? What the fuck 🤯
