where in the universe can one find such a thing?

If mass is gravitationally attracted to mass, then negative mass ought to be repelled by mass. Therefore, any negative mass will be found, literally, in the middle of nowhere .

 

If mass is gravitationally attracted to mass, then negative mass ought to be repelled by mass. Therefore, any negative mass will be found, literally, in the middle of nowhere .

​

 

The Em Drive refuses to go away:

https://www.popularmechanics.com/space/rockets/a33917439/emdrive-wont-die/​

One of McCulloch’s predictions is that thrust can be achieved with light as well as microwaves. Diaz has carried out experiments in Madrid testing this hypothesis by using an asymmetric loop of optical fiber wound 2,000 times, which he calls a Photon Loop.

 

The Em Drive refuses to go away:

https://www.popularmechanics.com/space/rockets/a33917439/emdrive-wont-die/​

Just like a nail fungus.

 

Pretty good article explaining why the EM Drive doesn't work:

https://www.space.com/can-emdrive-space-propulsion-concept-work​

 

Pretty good article explaining why the EM Drive doesn't work:

https://www.space.com/can-emdrive-space-propulsion-concept-work​

The EMDrive is a conspiracy theory.

 

View attachment 222045
The EMDrive is a conspiracy theory.

Yeah... it's called QAnDrive...

 

I thought the EMDrive had finally been killed off. The thing is the embodiment of "pull yourself up by your bootstraps." It doesn't work. I would ask "why won't it go away," but then I remember the "conspiracy theory" bit....

 

It's official... the EM Drive is dead... long live the quest for reactionless drives!.

“When power flows into the EmDrive, the engine warms up. This also causes the fastening elements on the scale to warp, causing the scale to move to a new zero point. We were able to prevent that in an improved structure. Our measurements refute all EmDrive claims by at least 3 orders of magnitude.”

 

Not dead.

 

I really hope that’s not a joke for tomorrow.

 

I honestly don't understand the logic behind this phenomena:

Robot Shows It's Possible to Swim Through The Emptiness of a Curved Universe

"We learned that the predicted effect, which was so counter-intuitive it was dismissed by some physicists, indeed occurred: as the robot changed its shape, it inched forward around the sphere in a way that could not be attributed to environmental interactions."

 

https://www.scientificamerican.com/article/surprises-from-general-relativity/#:~:text=For example, in a curved,fall even in a vacuum.

In general relativity, the structure of spacetime becomes distorted (that is, curved), producing what we perceive as the force of gravity. Whereas Newtonian gravity involves only space, relativistic gravity also involves time. This distortion of both space and time leads to effects such as one known as frame dragging: a rotating body (such as Earth) exerts a slight force in the direction of its rotation on other nearby objects (such as orbiting satellites). Loosely speaking, the spinning Earth drags spacetime itself around slightly. More generally, the velocity of motion of a mass influences the gravitational field it produces. Frame dragging and the glider are both examples of this phenomenon.

The swimming effect arises from non-Euclidean geometry, and the relativistic glider is a consequence of indissolubility of space and time. Other such phenomena may remain to be recognized and understood within the inscrutable equations of general relativity. Mr. Everard and other disciples surely have more adventures in store.

http://web.mit.edu/wisdom/www/swimming.pdf

The robot model (it's not real curved space) experiment was clever but it has the same thrust limitations of a photon rocket. Coulomb friction and the geometric phase change forces are limited by the same physics.

 

https://www.scientificamerican.com/article/surprises-from-general-relativity/#:~:text=For example, in a curved,fall even in a vacuum.


http://web.mit.edu/wisdom/www/swimming.pdf

In other words, this won't work in flat spacetime... right?

 

In other words, this won't work in flat spacetime... right?

It won't work any better than a photon rocket.

 

It won't work any better than a photon rocket.

That photon rocket again ... it took me a long LONG time to figure out what you meant. But I think I finally get it.

Please correct me if I'm wrong:
It's simple newtonian physics. "To every action there's always an equal and opposite reaction". One of the equations for motion is m1·v1 = m2·v2 ... So if one wants to obtain a reaction without expelling mass in the process, and considering that mass and energy are interchangeable, one could use an equivalent amount of pure energy (i.e. photons) instead of mass. And considering that E=mc² , said amount of energy would have to be humongous.

My hope is that maybe in the future there could be a work around through newly discovered physics, probably involving dark matter. But that's mere speculation. And as you've already said, it would have to be compatible and built on top of what we already know.

 

That photon rocket again ... it took me a long LONG time to figure out what you meant. But I think I finally get it.

Please correct me if I'm wrong:
It's simple newtonian physics. "To every action there's always an equal and opposite reaction". One of the equations for motion is m1·v1 = m2·v2 ... So if one wants to obtain a reaction without expelling mass in the process, and considering that mass and energy are interchangeable, one could use an equivalent amount of pure energy (i.e. photons) instead of mass. And considering that E=mc² , said amount of energy would have to be humongous.

My hope is that maybe in the future there could be a work around through newly discovered physics, probably involving dark matter. But that's mere speculation. And as you've already said, it would have to be compatible and built on top of what we already know.

The work around will likely be things like this: https://en.wikipedia.org/wiki/AIMStar

http://ffden-2.phys.uaf.edu/213.web.stuff/Scott Kircher/microfusion.html

 

The work around will likely be things like this: https://en.wikipedia.org/wiki/AIMStar

http://ffden-2.phys.uaf.edu/213.web.stuff/Scott Kircher/microfusion.html

Interesting ... thanks for sharing ... Say, have you watched Netflix's "The Expanse" ? ... it's pretty good Science Fiction, I must say.

 

Interesting ... thanks for sharing ... Say, have you watched Netflix's "The Expanse" ? ... it's pretty good Science Fiction, I must say.

It's cool but I like:

 

It's cool but I like:

LOL!