# Thread: What is tachyeon (did i spell it right?) + some other interesting stuff

1. As you should all realize, that a light year is how far light can travel in a year. A few days ago I was told that in 1995 a supernova 20,000 light years away was seen and the effects of the supernova have just been discovered. Being 20,000 light years away that means the supernova actually exploded 20,000 years ago and that we are seeing it now. The effects of this supernova shot many alpha and beta particles (radiation) into the side of the planet that was facing the explosion. The normal dosage (if you would call it) of radiation recieved normally is about 200 mRem and this number was increased by 80 mRem. Looking at the math if a supernova happened 10,000 years ago, the change would be at 320 mRem. Going to 5000, 2500, 1250, 625 years the effect each time would be muliplied 4X and so if a supernova exploded 312 1/2 years ago then the change would be a significant 327680 mRem or about 33 Rem which is enough to kill a person. If light travels the speed of light (obviously) and nothing is faster than light then how can we detect this? By the time it reaches us we would all be dead.

I heard of tachyeon and that it is a radio wave that can travel faster than the speed of light. Does this exist and how does it work? If this does exist can we use it to detect such bursts of radiation before it reaches the earth? Please repond with anything concerning the matter.

2. Hi WWTK,

Looking at the math if a supernova happened 10,000 years ago, the change would be at 320 mRem.
And why would this number suddenly increase when the explosion occured 10.000 years ago ? Well, I guess you want to say that if a supernova happens closer to earth (eg. 10.000 lightyears) the radiation doses increase.

Well you're right. If something happens too close to us (eg. Gamma Ray Burst) then we'll all be fried by radiation. It's a though universe son.

If light travels the speed of light (obviously) and nothing is faster than light then how can we detect this? By the time it reaches us we would all be dead.
Before the star goes supernova, it undergoes some fundamental changes that we can detect. Also, a supernova happens gradually (it takes some time for the large lightintensity to build up; this isn't weeks but more like a day or something) so if we happen to be looking in the right direction at the right moment then we might be able to see that a supernova is about to happen. Not that this will help us though, about 4 or 5 hours later it'd still fry the planet.

I heard of tachyeon and that it is a radio wave that can travel faster than the speed of light. Does this exist and how does it work? If this does exist can we use it to detect such bursts of radiation before it reaches the earth?
Tachyons are hypothetical particles that travel faster than light because they have an imaginary mass/energy. Theoretically they have the strange property that when they go faster and faster, the less energy they have (note: they cannot go lower than the light speed; that would also require an infinite amount of energy). Attempts to detect tachyons have been made all over the world, but nonbody succeeded so far. That and the fact that tachyons have a rather exotic behaviour (causility violation) have led most physicists to believe that they don't exist.

Bye!

Crisp

------------------
"The best thing you can become in life is yourself" -- M. Eyskens.

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•