The galactic center itself does not have a specific orbital speed as each object that comprises that area of space moves at a unique speed. The easiest answer would include the spin rate of the central black hole, Sagittarius A*, as well as the orbital periods of the closest surrounding stars, the Sagittarius A* cluster.

Per the two linked pages the black hole has an estimated spin rate of 0.1% the speed of light at the event horizon while the stars have orbital velocities between 0.15% and 8% the speed of light.

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Yes, almost all endogenous viruses will cause an active infection with symptoms of one kind or another if an organism is stressed enough. But sometimes the symptoms these viruses cause can actually be for the betterment or detrement of the host.

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An old trick for stinky shoes is to open them up and leave them in sunlight for this very reason!

“Which ones” is probably not a super stellar question because they probably have quite boring technical names, and the list of ones we actually have found and named is likely much smaller than the list of potential causative agents.

References 4-7 of the linked text:

> 4. Boller K, Konig H, Sauter M, et al. Evidence that HERV-K is the endogenous retrovirus sequence that codes for the human teratocarcinoma-derived retrovirus HTDV. Virology 1993;196:349–53. [PubMed] [Google Scholar]

>5. Lower R, Boller K, Hasenmaier B, et al. Identification of human endogenous retroviruses with complex mRNA expression and particle formation. Proc Natl Acad Sci U S A 1993;90:4480–4. [PMC free article] [PubMed] [Google Scholar]

>6. Nelson PN. Retroviruses in rheumatic diseases. Ann Rheum Dis 1995;55:441–2. [PMC free article] [PubMed] [Google Scholar]

>7. Nelson PN, Lever AML, Smith S, et al. Molecular investigations implicate human endogenous retroviruses as mediators of anti-retroviral antibodies in autoimmune rheumatic disease. Immunol Invest 1999;28:277–89. [PubMed] [Google Scholar]

Some rheumatic conditions and at least one cancer have been at least linked to expression of human ERV’s, if not necessarily the causative agents of such.

Remember that nature is constantly moving. Dirt, debris, and bacteria move into an exposed area faster than it can be sterilized. For this to work, you have lay something out for a long time and have it not be disturbed, which simply doesn't happen in nature. Also remember that your skin is constantly touching things and excreting moisture and oils.

UV from the sun is UVA (320÷400nm) and UVB (280÷320nm) which are, especially UVA, less effective for disinfection than UVC wich doesn't reach earth surface as it is absorbed by ozone. UVB can still disinfect but needs much more time than UVC, as in water disinfection https://en.m.wikipedia.org/wiki/Solar_water_disinfection but since its less effective it requires at least 6 hours, while UVC only takes seconds Wastewater Technology Fact Sheet: Ultraviolet Disinfection. Reason for this is that DNA, the target molecule of UV, has peak absorption in the UVC band at about 260nm and that's close to the 254nm emitted by germicidal lamps https://www.bmglabtech.com/en/application-notes/uv-absorbance-dna-quantitation/

We’re really good at finding the specific wavelength and intensity to denature nucleic acids at a specific distance. If you brought a filthy object close enough to the sun to replicate our little monkey toy’s intensity at that wavelength, the object would most certainly be cleansed.

They might carry it, sure, but I’d argue it was likely their great-grandparent^nth that was actually infected.

I think this line of inquiry is more about re-emergence of previously-dormant ERVs. As a human, some ~1-8% of my DNA is ERVs, depending on who you ask, but I’m pretty confident that I was never infected by any of them myself. I was just born carrying them.

You can. Take a dirty dish, wipe it clean with paper towels, then set it in direct sun for 20 minutes.

You can investigate how well this works by first creating a bunch of culture dishes. Jar lids set on a cookie sheet work ok, cover the sheet with cling wrap. Fill the lids with jello made according to directions, but add a half teaspoon of water soluble garden fertilizer to the batch of jello. Miracle gro is great.

Boil your lids before filling them. Bleach the cookie sheet.

Divide your lids into 5 groups:

Group 1: Using a clean Q-tip, draw a line on a culture plate. If doing multiple plates, use a fresh end each time.

Group 2: This time use dishes from the dishwasher. Rub the q-tip on the freshly washed dish then on the culture plate.

Group 3: Like group 2,but dishes from the cupboard.

Group 4: Dishes that you ahve "sun washed"

Group 5: Your kitchen floor. 'cause, why not?"

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Put the cling wrap over the tray and set it somewhere warm Top of the fridge is out of the way.

UV is denoted in at least 4 different wavelengths: A, B, C, and Far C. UV lights for sterilization purposes are designed to put out UV C at a specific measurable distance at a large enough intensity to disrupt the DNA in bacteria and virus.

UV C at this intensity is not safe to be directly in contact with, though glass does limit how much UV C passes through. Depending on the size of the room, UV disinfection lights need to be ran multiple times in different positions because of shadows and distance. They're really only good for about 8 ft wide areas.

Far UV C is in trial phases and is a specific wavelength at the end of the UV C range that is both safe for skin exposure because it only affects the top layer of the epidermis, which is already dead, while at the same time being more destructive to the baddies to the point of being considered safe to treat surgical site infections or being built into normal light fixtures.

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Even risking dysentery isn’t worse than dying of dehydration.

Doctor can fix dysentery. Can’t fix dead.

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