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@BP: You seem to be focus too much on the physic. Let try biology.
As you guy all know human's cells can regenerate to heal our damage organ. But the number of time each human's cells can regenerate is limited. That why we die. Same go for all other living being, there's no exception. But we know that the number of time that those cells can regenerate are different for each species. That mean some have more than us and some don't. And we haven't known about the life support condition on the other planets. There are maybe some species can live for centurys or even more, so all they have to do is to go with the maximum speed and enjoy the show.
If they can't make it that far before they die, then there are some more method to help them reach our planet:
As you said before, we have live for about 0.0001% of all existing time. If those species have live for about 20% of those time and have a brain close to us, they could invent something that can help their brain still working even if their bodies are no longer exist. We all know that if our heart stop beatting, we're still alive as long as our brain still work. We just die because there's not enough blood to feed our brains. So if the brain still work, you still there. So all they got to do is to keep it work aka become a cyborg so they could live forever.
There's another possibilities that they can't live very long but they can use about 15% of there brain power (consider there brain are just like us). Human can use only 3% tought and with only those 3%, in 1903 we flew for the first time, 66 years later, we landed on our moon. Now, with a brains that's 5 time better than us what do you think they can do if they live as long as us? Just imagine this, well, you know that space-time has ten dimensions. There are the normal dimensions of up/down, left/right, and forward/back. Then there is the fourth dimension, which is time. Then, there are six other dimensions, but they are curled up into themselves, so we don't see or feel them. All we feel are three space dimensions, plus time. Imagine if, instead of three normal space dimensions, we only had two. Imagine we were flat, and we couldn't go up or down, just in the other two directions. Like if we lived on a piece of paper. Call us the Flatties. And if someone came along and drew a box around us, we could never get out. Because the lines of the box would be walls. But what if a three-dimensional person came along? A threedimensional person could lift that Flattie right up out of that box. The Flattie wouldn't even know what was happening, because he's never gone up or down before. He doesn't even know up and down exist. So if some creature came along who have a lot more brain power than us, he'd be able to do things that would be impossible for us.
The last things I can think of is that we don't know how many very real chances there are that somewhere beyond our ability to scope, some new element still exist. They could be more powerful than 10 solar system combine. If the aliens can use them, light speed is no problem. And one last things, how many ray can we detected? They could live very close to us, but our telescopes can't see them, and none of our detectors can pick up any trace of life form out there because we don't know what to look. So we don't know that they are still exist.
@Kururu:
I don't get it.
As you guy all know human's cells can regenerate to heal our damage organ. But the number of time each human's cells can regenerate is limited. That why we die. Same go for all other living being, there's no exception. But we know that the number of time that those cells can regenerate are different for each species. That mean some have more than us and some don't. And we haven't known about the life support condition on the other planets. There are maybe some species can live for centurys or even more, so all they have to do is to go with the maximum speed and enjoy the show.
If they can't make it that far before they die, then there are some more method to help them reach our planet:
As you said before, we have live for about 0.0001% of all existing time. If those species have live for about 20% of those time and have a brain close to us, they could invent something that can help their brain still working even if their bodies are no longer exist. We all know that if our heart stop beatting, we're still alive as long as our brain still work. We just die because there's not enough blood to feed our brains. So if the brain still work, you still there. So all they got to do is to keep it work aka become a cyborg so they could live forever.
There's another possibilities that they can't live very long but they can use about 15% of there brain power (consider there brain are just like us). Human can use only 3% tought and with only those 3%, in 1903 we flew for the first time, 66 years later, we landed on our moon. Now, with a brains that's 5 time better than us what do you think they can do if they live as long as us? Just imagine this, well, you know that space-time has ten dimensions. There are the normal dimensions of up/down, left/right, and forward/back. Then there is the fourth dimension, which is time. Then, there are six other dimensions, but they are curled up into themselves, so we don't see or feel them. All we feel are three space dimensions, plus time. Imagine if, instead of three normal space dimensions, we only had two. Imagine we were flat, and we couldn't go up or down, just in the other two directions. Like if we lived on a piece of paper. Call us the Flatties. And if someone came along and drew a box around us, we could never get out. Because the lines of the box would be walls. But what if a three-dimensional person came along? A threedimensional person could lift that Flattie right up out of that box. The Flattie wouldn't even know what was happening, because he's never gone up or down before. He doesn't even know up and down exist. So if some creature came along who have a lot more brain power than us, he'd be able to do things that would be impossible for us.
The last things I can think of is that we don't know how many very real chances there are that somewhere beyond our ability to scope, some new element still exist. They could be more powerful than 10 solar system combine. If the aliens can use them, light speed is no problem. And one last things, how many ray can we detected? They could live very close to us, but our telescopes can't see them, and none of our detectors can pick up any trace of life form out there because we don't know what to look. So we don't know that they are still exist.
@Kururu:
I don't get it.