Featured Post

The Magical Adventure of Luna the Cat

Image
  Once upon a time in a quiet little village, there lived a curious cat named Luna. Luna wasn't an ordinary cat; she had a special power. When the moon was full and bright, Luna could talk to the animals in the forest. One evening, as Luna gazed out of the window, she noticed the moon glowing like a giant lantern in the night sky. She knew it was time for her magical adventure. Luna slipped out of the house and ventured into the deep, mysterious forest. As Luna walked deeper into the woods, she heard the soft rustling of leaves and the gentle hooting of an owl. It was Owly, the wise old owl. Luna greeted Owly and told him about her adventure. Owly said, "Tonight, Luna, the forest animals have a problem. The river has dried up, and we're all thirsty. Can you help us find water?" Luna nodded and said, "I'll do my best, Owly." With Owly perched on her back, Luna started her journey through the forest. Along the way, they met a squirrel named Sammy, a rabbit
Post a Comment

IS TIME TIME TRAVEL POSSIBLE??? - ASKS UTKARSH SHINDE


 All of us, of course, time-travel forwards at the rate of one second per second.


The Theory of Relativity* tells us that it is also possible to time-travel forward at different rates. For example, time dilation*, a consequence of the Theory of Relativity (for particles that move almost with the speed of light) or the fact that time slows down in the presence of strong gravitational field, are real, verified facts. Thus, continuous forward time-travel is perfectly OK. (By continuous, mean there should be no gaps in the accounting of time.)


What is problematic is travelling backwards in timeand this is what usually is meant by `time-travel' in popular movies and books. This is not allowed by laws of physics as we know them now, since these laws have "causality" built into them.


Causality means that the cause happens before the effect, and not vice versaFor example, a glass breaks after it falls downit does not fall down after it breaks; the falling comes first. Thus, causality is tightly woven into the arrow of time that points in only one directionAll our millions of observations everyday agree with this. There has not been a single violation.


Does this mean backward time-travel is 'impossible'? Well, a single verified instance of backward time travel will force us to change our theories, but that looks extremely extremely unlikely.


Science fiction is full of backward time-travel. Good sci-fi ensures that there is no logical contradiction: nothing that will change the future is disturbed. While I love these, what all of them miss is that if something from future were to land suddenly, the Law of Conservation of Energy* would be violated. And we have not seen this yet.


The only way to get around this will be saying that all the backward time-travel has been hidden by some strange coincidence. And that is not a good excuse. You might as well have an invisible unicorn in your house.


So, backward time travel is the stuff of science fiction; impossible according to all our observations and laws of physics so far. But suppose laws of physics have missed something? That's speculation till we observe a single verified incident.



Comments

Post a Comment

Popular posts from this blog

The Tortoise and the Hare

Image
Once upon a time, there lived a tortoise and a hare. The hare, who was very fast, always teased the slow tortoise. "Ha, ha, ha! Even a snail is faster than you!" he said. The tortoise did not like the teasing one bit. Finally, he decided to do something about it. "Let's have a race, " he said. The hare fell down laughing. "OK, but you know I will win," he said. "We will see," said the tortoise. On the day of the big race, all of the animals came to watch. "On your mark, get set, go!" said the fox. The hare hopped. Fast, fast, fast. The tortoise walked. Slow, slow, slow. The hare hopped. Fast, fast, fast. The tortoise walked. Slow, slow, slow. Soon the hare was way ahead of the tortoise. "Ha, ha, ha! I can take a nap and still wake up in time to beat the tortoise," said the hare. So he did. Snore, snore, snore. But as the hare napped, the tortoise walked Slow, slow, slow. And guess what? By and by, the tortoise passed the h
Read more

Phonics Workbook for the phonics screening check

Image
 Phonics in the Foundation Stage (Ages 3 to 5) Phonics is the relationship between sounds (phonemes) and letters or groups of letters (graphemes). Learning phonics involves listening to sounds, recognising sounds and discriminating between sounds as well as learning how sounds are represented by letters. When first learning phonics, children should have many opportunities to enjoy listening to and reading stories, poems, songs and rhymes, as well as information books about topics that interest them. How this book is organised Letters of the alphabet (p. 6-13) introduces upper- and lower-case letters, in order, by name. You could use these terms with your child or capital letters' and "lower-case letters' (as there is no other simple term for "lower-case'*). The letters are introduced in a way that helps children learn letter formation as well as position in the alphabet. There are further activities on the letters of the alphabet at later stages of the book (p. 28
Read more

Martina the Cockroach

Image
  Once upon a time there was a pretty cockroach named Martina. She lived in a nice little house. One day she found a gold coin while sweeping her floor. What should she buy? Should she buy shoes? Should she buy candy? "No, I will buy perfume, " she said. She bought perfume and put it on. Then she fixed her hair and put on a pretty dress. Martina looked and smelled beautiful! Now, she was ready to get married. But she did not want to share her home with a noisy husband. A cat came by and said, "Marry me!" "What sound do you make?" asked Martina. "Meow, meow!" he said. "No, thank you, " she said. A rooster came by and said, "Marry me!" "What sound do you make?" asked Martina. "Cock-a-doodle-doo!" he said. "No, thank you," she said. A frog came by and said, "Marry me!" "What sound do you make?" asked Martina. "Ribbit, ribbit!" he said. "No, thank you, " she sai
Read more