New species of tardigrade reveals secrets of radiation-resisting powers • Hacker News Board

Re: New species of tardigrade reveals secrets of radiation-resisting powers

#11

Post by ASalazarMX » Fri, Oct 25, 2024, 7:29 PM UTC

dekhn wrote: post #8

im3w1l wrote: post #5

Earlier quoted context omitted.

I get what you mean but tardigrades don't photosynthesize, so you still have the problem of what they should eat.

You send them with algae and photosynthetic bacteria, which are also pretty robust. Algae is (are?)a mazing. I would not at all be surprised if you sent tardigrades to enough remote planets, that they would find some local equivalent of algae that is mostly digestable. And photosynthetic bacteria were some of the earliest forms of life on earth, likely surviving adverse conditions (I think it's still an open question…

If we're speaking about terraforming, cyanobacteria photosynthesizes, produces oxygen, and is also hardy. Forget the tardigrades, we don't want to fight their descendants when humanity eventually colonizes.

Bonus: the rise in oxygen might kill any existing native life, or make it more like ours.

Re: New species of tardigrade reveals secrets of radiation-resisting powers

#12

Post by ASalazarMX » Fri, Oct 25, 2024, 7:32 PM UTC

dekhn wrote: post #10

deafpolygon wrote: post #3

Earlier quoted context omitted.

Maybe they were

it's unlikely, as they showed up evolutionarily after preceding organisms and were wholly consistent with evolution of preceding organisms. They are remarkably similar to other organisms, like isopods.

The advantage of panspermia is that when cornered, it can retreat to more primitive life forms, and even basic life molecules. It can't be reasonably unproven, so the onus is on the supporters to prove it.

Re: New species of tardigrade reveals secrets of radiation-resisting powers

#13

Post by jajko » Fri, Oct 25, 2024, 7:47 PM UTC

begueradj wrote: post #9

im3w1l wrote: post #4

What confuses me about tardigrades is how they are resistant to so many things. Like it would make sense to have resistance to one or two things, but all those things? Why is that even needed? Do they keep ending up in bad situations?

> "Like it would make sense to have resistance to one or two things, but all those things? " It makes sens, and all organisms and creatures would be more than happy to evolve to where they have resistance to everything. That's a way to remain healthy, strong and spread own genes as much as possible for a long time.

There is usually some energy cost associated to keeping resistance unless critically needed. Or limited place on genome.

Any organism from virus to human will happily shed over time (generations) any resistance we now consider crucial to survival, just change its environment enough.