An Astronomer Just Laid Out a Navigation System For Interstellar Space Travel

https://www.sciencealert.com ^ | 22 MARCH 2021 | MICHELLE STARR

[A Navy Vet]

"six dimensions - three in space and three in velocity"

I never heard of 3 dimensions of velocity. Can someone explain that to a layman? I always thought velocity meant speed, whether initial or continuous or decaying. Are those the 3 dimensions? If so, the word dimension has taken on new meaning to me. If not, then I would call it a varying (degree) of motion.

[A Navy Vet]

"The Milky Way may be moving away from other galaxies, but the stars within it are moving as a unit, albeit a spinning unit."

At that speed of spinning - same problem.

[SunkenCiv]

By the time our species gets to visit the Orion Slave Girls, we'll be glad other scientists kept working on ED remedies.

[PapaBear3625]

Interstellar travel makes no sense unless wormholes can be created and permit passage—way beyond current technology.

Voyages which would need to last thousands of years only make no sense to current humans, with current human lifespans and limited time horizons.

"That is not dead which can eternal lie,
And with strange aeons even death may die."

[larrytown]

Grant money!

[PapaBear3625]

I never heard of 3 dimensions of velocity.

Velocity involves speed AND direction. So you need the x,y,z component of the vector.

[Jewbacca]

Not at all.

They are spinning together in a predictable manner.

[Red Badger]

I never heard of 3 dimensions of velocity.

Is that like the 6 Degrees of Kevin Bacon?...............

[Phlap]

To get anywhere, we need a propulsion system that we ain’t got.

[Red Badger]

That you know of....................

[M Kehoe]

Hey, we have already discussed this. You gotta have the Spice.

Otherwise you are doomed.

5.56mm

[A Navy Vet]

"Is that like the 6 Degrees of Kevin Bacon?"

I love bacon, so I'm just one degree off.

[dfwgator]

[Redcitizen]

Which novel was the turning point? I know I liked some of his earlier stuff, then I noticed the same plot points so I stopped reading...

[Red Badger]

Gotta get to Arrakis first!....................

[A Navy Vet]

"Velocity involves speed AND direction."

Okay, just looked up velocity and vector. I learned way back in school that direction was trajectory. Velocity is speed. The physics definition is enlightening. Still, that is only 2 dimensions. Where is the 3rd? BTW, that is not what most people believe about velocity and trajectory. Guess we're all behind the definitions.

[A Navy Vet]

Sorry Kevin, the bacon is probably going to kill me.

[Seruzawa]

Stanger in a Strange Land was the last book that didn’t go off the deep end with group marriages as I recall.

[Phlap]

Hey Red, the moderator removed your home page. What’s up with that?

[Red Badger]

LOL!.................
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Old Indian trick!
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