Are spiral galaxies on their last leg of life?

Are spiral galaxies on their last leg of life?
Are there long term effects from COVID in fully vaccinated people?
Is the flu we get vaccinated for today just a variant of the 1918 Influenza?
What's the most complex parasite life cycle that we know of?
When I look at the world tropical storm map, the overwhelming majority of the subtropical climate seems to be affected, except for South America. Why is that?
SARS-CoV-2 infections appear to cause BBB dysfunction (permeability); is it permanent or can the BBB recover its integrity?
How does nature know the least energy path? - Lightnings case study
When you put someone else’s antibodies into your body, does your body learn how to make copies of the foreign antibody or not?
Are polarized sunglasses less effective in Manhattan?
Can air be compressed? Is air considered a fluid?
When the sun burns out, will it just disappear? Causing all the planets in it's orbit to float away into space?

Posted: 09 Sep 2021 04:14 AM PDT

Hi folks,

Is this the final stage of a galaxies life as the black hole has grown large enough that it is pulling every star i to the centre of the the galxay creating a vortex of light?

If so, would galaxies that have an even disc/belt shape be mid aged as the black hole has enough force to keep the stars close but not on a tragectory inwards?

Would young galaxies be clusters of stars where the black hole does not have enough force and time to shape it into a disc?

Do all galaxies spin in the same direction? I only ask because if half of visible galaxies spinned one direction and the other half another direction would this indicate that the universe has hemispheres.

submitted by /u/Ill_Scallion_9134
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Are there long term effects from COVID in fully vaccinated people?

Posted: 08 Sep 2021 03:01 PM PDT

Long time lurker, first time poster, long time loser in this pandemic.

So I remember multiple papers being published showing evidence of long-term, if not potentially permanent, brain/heart/lung damage from COVID, even if the person showed no symptoms.

1) how accurate is that? 2) If it is, is there any evidence that being fully vaccinated does/doesn't prevent said damage to occur in case of getting COVID?

Edit; apparently some people think I am doubting the efficacy of vaccines. I am not. got double vaxxed as soon as I could and the evidence that it protects you from serious side effects and death seems pretty irrefutable. I'm asking specifically about the damage COVID has done to the lungs, heart, brain that has been found in folks who have tested positive even when asymptomatic.

submitted by /u/MerryfaceAviation
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Is the flu we get vaccinated for today just a variant of the 1918 Influenza?

Posted: 09 Sep 2021 06:33 AM PDT

I know the there is basically a different strain of the flu virus every year, which is why there is a new flu shot every year. Is this the result of the 1918 Spanish Influenza pandemic?

I've been reading that Covid is more or less here to stay, and it will likely have annual variants that may require yearly boosters. Is this similar to the 1918 pandemic?

submitted by /u/LawsOfWonderland
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What's the most complex parasite life cycle that we know of?

Posted: 08 Sep 2021 11:33 AM PDT

submitted by /u/JoelWHarper
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When I look at the world tropical storm map, the overwhelming majority of the subtropical climate seems to be affected, except for South America. Why is that?

Posted: 08 Sep 2021 09:57 AM PDT

This is a map of world's tropical storms, and while it affects every subtropical region that is near the sea, Both Eastern as well as Western South America is excluded. We see on the map that along the same longitude (Southeast Asia, North Australia etc) there exists tropical storms. Why is this the case?

Edit: I should edit this question and ask why they are so rare, instead of not occuring at all

submitted by /u/Jinglemisk
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SARS-CoV-2 infections appear to cause BBB dysfunction (permeability); is it permanent or can the BBB recover its integrity?

Posted: 08 Sep 2021 12:15 PM PDT

This study shows that in some models, SARS-CoV-2 can not only cross the BBB, but also alter its permeability. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7961671/

Is that alteration in the BBB permanent? Or does the BBB recover its integrity over time again?
What are the neurological consequences of this?
Can spike proteins produced by mRNA vaccines cross the BBB on their own and produce the same issues in BBB permeability and integrity? Or does the mRNA vaccine's spike protein not harmful in the same way because its produced by our body in its prefusion state?

submitted by /u/reutertooter
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How does nature know the least energy path? - Lightnings case study

Posted: 08 Sep 2021 10:53 AM PDT

I came across this question when I was looking at lightnings during a storm. Apparently lightnings are not straight lines to ground because air is non-homogeneous (so more ionic particles could be at a different spot than just simply straight down) and that not all points on ground offer the same potential difference to discharge the lightning, reason for which trees are sometimes hit or that water bodies (lakes) often take the discharge. But the question is: how does nature know in advance which path is best? Does it take this decision molecule after molecule? Is it really the least energy path the one that the lightning took? Or could there have been a better one? If it does take the decision molecule after molecule, how can it land exactly on the tip of the tree or on a water surface? Wouldn't random probability dictate this?

submitted by /u/Nic6i
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When you put someone else’s antibodies into your body, does your body learn how to make copies of the foreign antibody or not?

Posted: 08 Sep 2021 02:31 PM PDT

submitted by /u/Tiktoker_Oop
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Are polarized sunglasses less effective in Manhattan?

Posted: 08 Sep 2021 02:22 PM PDT

…or any other city with skyscrapers and large windows at eye level.

My understanding of how polarized glasses work, and please correct me if I'm wrong, is that they block out horizontally polarized light reflected off the ground where you can encounter sheets of snow (like when skiiing) or the ocean, and reflectivity is high.

Knowing this, would light reflected off large windows that are standing parallel to you only reflect vertically polarized light that these sunglasses would let through? This wouldn't cause much issue in day to day life, but what if you lived in Manhattan, where you are constantly surrounded by large windows?

If they are less effective, by how much? Would these glasses be useless in a city, or would it be more or less negligible?

submitted by /u/witchking96
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Can air be compressed? Is air considered a fluid?

Posted: 09 Sep 2021 12:06 AM PDT

Mobile format (sorry)

Hydraulic principle states that fluid cannot be compressed, so any force you apply at one end will be fully transferred to the other end. But I also know that you can buy a canof compressed air and air is considered a fluid (to my knowledge).

Am i missing something? Is there any error in the statements above? Is it just simply a naming problem? Thanks in advance!

submitted by /u/Righart
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When the sun burns out, will it just disappear? Causing all the planets in it's orbit to float away into space?

Posted: 08 Sep 2021 07:46 AM PDT

submitted by /u/Bonedron
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