A few days back we had a talk in our department by an astrophysicist on supernova remnants. This was a study of the dust cloud thats left behind by stars who could not stand their own weight and blew up, the explosions are called supernova/e . The SRs have been seen in our own galaxy too and are some 3000 light years away. An interesting question was raised. Since
these stars are some 3000 light years away (meaning the light from them has taken 3000 years to reach us), what is being studied now is in the past (in fact 3000 years back). How does one know what is the current status of those remnants? Seen this way, our future generations 3000 years from now will know what is happening now, not us :-D To this, the speaker had a smooth answer. SRs have been seen in other galaxies too and these are some 10000 light years away. Since, the constitution of those SRs is the same as those in our galaxy, we can compare the time status and predict what will happen to the observations 3000 years later. One advantage of predictive science. BTW pony tails seems to be the latest fad amongst physicists these days. Why would anyone ever want to grow hair at all?!!
Douglas Adams in Hitchhikers guide to galaxy has an interesting take on time travel. Ill copy paste that here
One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with. ... The major problem is quite simply one of grammar, and the main work to consult in this matter is Dr Dan Streetmentioner's Time Traveller's Handbook of 1001 Tense Formations. It will tell you for instance how to describe something that was about to happen to you in the past before you avoided it by time-jumping forward two days in order to avoid it. ... Most readers get as far as the Future Semi-Conditionally Modified Subinverted Plagal Past Subjunctive Intentional before giving up: and in fact in later editions of the book all the pages beyond this point have been left blank to save on printing costs.
Hitchhikers is a must read :-D
(Pic from wiki)
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