It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
dlbott
reply to post by Harte
Have read few theories, one is that not all alien races have this tech, that in fact they are at different levels of advancement themselves. They have also fought wars amongst themselves.
There is also another theory of travel and it follows that the universe has a current no unlike our wind or ocean current. This current is believed to travel at or near the speed of light.
Could explain how some travel.
The Bot
Harte
Regardless of how you get there, any search of the galaxy for life would be extremely unlikely to turn us up because of what I said.
The 4700 years is just the sum of all the one-second stops. It includes no travel time at all.
And that's only half the star systems in the galaxy.
Harte
tanka418
reply to post by FireMoon
Now there is something I haven't been able to understand; where y'all get the idea that to exceed the speed of light requires infinite energy. I've not ever seen any equation that states that, not ever, and I have two master's degrees (engineering).
All One needs to do is set-up a constant acceleration of 1G and hold that for just over 1 year: you will be traveling over the speed of light.
One only needs the energy of an "Aircraft Carrier sized nuclear power plant (about 1GW), and a Gravito-electromagnetic drive.
Actually the biggest issue with interstellar travel isn't the speed so much as it is the "time". strange things happen to time at those velocities. Time dilation can be a real party pooper, and is a far greater issue than velocity,
Curious2Know
Perhaps they have somehow detected our universe and were attracted by the thousands of nuclear tests that took place in the recent past. Perhaps they see us at a wreck less and critical stage of technological development.
There's no such thing as an engineered gravity-electromagnetic drive as far as we know.
Take the equations of motion for a positive mass particle in special relativity. Add a force, and compute the total energy balance.
tanka418
reply to post by FireMoon
Now there is something I haven't been able to understand; where y'all get the idea that to exceed the speed of light requires infinite energy. I've not ever seen any equation that states that, not ever, and I have two master's degrees (engineering).
mbkennel
Actually the biggest issue with interstellar travel isn't the speed so much as it is the "time". strange things happen to time at those velocities. Time dilation can be a real party pooper, and is a far greater issue than velocity,
Actually the problem is extreme hazard from any dust----encountering even the smallest particles at relativistic speeds give catastrophic results, and the crew fatally irradiated a few hours into the voyage.
Mass increases with velocity:
m' = m/sqrt[1-(v/c)^2]
where m is the mass of an object at rest and m' is the mass at velocity v.
tanka418
reply to post by Harte
Mass increases with velocity:
m' = m/sqrt[1-(v/c)^2]
where m is the mass of an object at rest and m' is the mass at velocity v.
I presume that "c" is the speed of light.
So then: this equation when solved for any v < c : m' < m. when v = c : m' = m.
So, mass does increase with velocity, but that is [I]after[/I] an initial decrease, then it increases back to the original "rest mass" at the speed of light. That a bit different than what yall said.
Harte
Mainly because you did it incorrectly.
For v=c, m'=m/0. m divided by zero.
You're "artificial gravity" will first have to be invented. And then, the gravity source will have to be accelerated. To c. It will have mass. Back to the same problem.
Harte
tanka418
Harte
Mainly because you did it incorrectly.
For v=c, m'=m/0. m divided by zero.
Yes, I interpreted the equation incorrectly at first; my bad.
However, the notion that dividing by zero results in infinity may be incorrect. In reality the operation is "invalid", not something that returns an infinite result. This could indicate that, as I predict, some thing change at "c".
tanka418
You're "artificial gravity" will first have to be invented. And then, the gravity source will have to be accelerated. To c. It will have mass. Back to the same problem.
Harte
A few posts above you will see a link to "artificial gravity" there are a whole bunch of papers explaining the science. The science was published in 2003, and more in 2006. The gravity source produces an "acceleration vector" which provides all the propulsion needed to reach c+.
tanka418
Anyway; one more question; why is the mass of a photon not infinite?
tanka418
Life is everywhere, its bloody ubiquitous, prolly exist in a vacuum.