From earth it would look like it has taken thousands of years to get to the star where on the ship it has only taken 4.2 years. That show I understand it.
I hate relativity.[edit]How far can one travel from the Earth?
Since one can not travel faster than light, one might conclude that a human can never travel further from the earth than 40 light years, if the traveler is active between the age of 20 and 60. So a traveler would never be able to reach more than the very few solar systems which exist within the limit of 20-40 light years from the earth. But that would be a mistaken conclusion. Because of time dilation, he can travel thousands of light years during his 40 active years. If the spaceship accelerates at a constant 1G, he will after 10 years reach speeds close to the speed of light, and time dilation will increase his lifespan to thousands of years, seen from the reference system of the Solar System, but his subjective lifespan will not thereby change. If he returns to the earth he will land thousands of years into the future. His speed will not be seen as higher than the speed of light by observers on earth, and he will not measure his speed as being higher than the speed of light, but he will see a length contraction of the universe in his direction of travel. And as he turns around to return, the Earth will seem to experience much more time than he does. So, although his (ordinary) speed cannot exceed c, his four-velocity (distance as seen by Earth divided by his proper (i.e. subjective) time) can be much greater than c. This is similar to the fact that a muon can travel much further than c times its half-life (when at rest), if it is traveling close to c.[22]
He does not though. i need a brick wall
Right are we in agreement for a person on earth it takes 4.2 years for light to get to the nearest star?
If so how can it also take 4.2 years for the person on the ship? this is where the time dilation comes in.
The person on the ship would look out and everything would be going extremely quick exterior to the ship.
Where as someone looking into the ship the person on the ship would be going in super slow motion. This is the dilation effect.
light is being measured at 4.2 years by someone on earth, not by someone traveling at a extremely fast speed.
The key don't forget is it takes 4.2 years from the earths perspective.
Sorry seems like yu are right.
I hate relativity.
Are not the ship and the person within the ship both travelling at the same speed.
So if the ship is moving fast to the outside observer, so is the person inside the ship.
It is only the subjective time compared between the observer (person on earth) and the object(person on the ship) that is effected by the time dilation.
So if it takes 4.2 years by the observers perspective for the ship to travel that far, it has only taken a couple of hours on the ship.
That would surely mean that the ship is travelling faster than the speed of light, would not the 4.2 years be the ship time if it were travelling at the speed of light and the observers time due to time dilation would be 4.2x60.2 which would give a period of 252.84 years passing back on Earth?
by all means correct me, I am going by the table you shown me earlier.
No this ship / people on it is moving slow to the outside observer.
Everything is exterior to the ship is moving very fast for in side the ship observer.
Again mixing the observer from earth and the traveler up, you should have divided instead of multiplied.
I do believe in UFOs.
Given the size of the universe and the potential of other intelligent, and even more advanced lifeforms, I do believe that there has to be some other life out there with the capability of far superior space exploration to what we have.
There wAs a time when scientists said the human body couldn't travel faster then 10mph in a vehicle as our bodies couldn't take the strain. . .
On this matter of saying you cant go faster then light is rubbish. The speed of light is just a speed, just like sound it can be broken.
I don't believe in anything. I don't like the idea of thinking something is true without any reason to do so. I prefer to at least try to judge the evidence and thus not need belief.
There undoubtably are UFOs, i.e. things in the air that are unidentified. That doesn't mean they are alien in origin. They could be natural. They could be of human origin and either a hoax or a secret.
Would we care if they saw us?
No, but I think that we would be interested in examining those monkeys and abducting some for experimentation![]()