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Saturday, April 10, 2021

When was the last time a star exploded?

 By  Administrator  |  Saturday, April 10, 2021

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.

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Saturday, April 10, 2021
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Wednesday, February 10, 2021

Republic Day : History, importance and interesting facts

Republic Day is celebrated every year in India on January 26 to commemorate the date on which the Constitution of India came into effect, in the year 1950, and the country became a republic.India became independent on August 15, 1947 — but it was not a date that India had chosen for itself, rather it was thrust upon by Lord Louis Mountbatten, as it marked the second anniversary of Japan’s submission to allied powers after World War II.While India became independent from British Raj following the Indian Independence movement, it didn’t have a constitution of its own. Indian laws were based on a...Read Full Blog

 By Administrator  |   Tuesday, January 26, 2021

Administrator commented  
Wednesday, February 10, 2021
good read..
Administrator Answerd a question  
Monday, February 8, 2021

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.