Why is the risk of getting COVID-19 higher in crowded spaces?

 By  Chammarow  |  13 days ago

Is the risk is higher in India?

Most crowded spaces aren’t sunlit - no UV to kill the virus.
Most crowded spaces have comparatovely less ventilation than outdoors- the virus stays near people longer.
Distance matters. Crowded spaces mean you are closer to the source of the virus, even touching if crowded enough.
Many crowded spaces have surfaces that can distribute the virus.
People go to many crowded places to socialize. As they mingle, they expose themselves to more possible sources.
Since it has been published that the risk is higher in crowded spaces, the people there tend to take riskier actions that make their chance of having the virus higher (virus deniers and anti maskers frequent this type of gathering)
All of these are simple common sense.

More infected people closer to you in an environment that facilitates infection = higher risk.

When was the last time a star exploded?

 By  Administrator  |  13 days ago

Please provide source of answer..

“Last observed event” vs “when did that event occur” becomes a tricky separation. Many of these observations are events that occurred a very long distance away. We are into arguments not unlike “If a tree falls in the forest….”

Many astronomical observations will have the year first observed embedded in their name somewhere. This “year observed” in the name can make “when” discussions confusing.

I’m gonna need some more air quotes here. Asking “when” makes it tricky. It might be either CAS A or SN1054. Both were about 7100 years ago. There was also SN 1572 of course. I’m not in the know or a terribly knowledgeable layperson. It catches my eye every now and then. Everything is “that we know about” caveat. Every Astronomy text book needs to be thrown out every two years or so.

I’m going to get the obligatory pop culture reference out of the way as SN 1987a was headline news when I was in high school and captured many peoples imagination. While we finally saw 1987a in 1987, we observed an event occurred over 160,000 years ago in the Large Magellanic Cloud outside our galaxy.

Is there anything like ghost ?

 By  Debjani Roy  |  Monday, March 8, 2021

Don't watch those horror movies and believe about ghosts, they are just the imagination of humans, humans are afraid by the fear of unknown. For example, in older periods, they could have seen a bush move. There are many reasons for the bush to move, but humans imagined that the dead people come again!
fear of unknown

What is relativity theory of Einstein?

 By  Kamal Bose  |  Sunday, February 7, 2021

In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers. This was the theory of special relativity.