No, a fusion rocket is much more technologically difficult than a fusion
power plant. The power plant can be very large and heavy. The power
plant just need to produce heat; the rocket needs to direct the fusion
products.
Brent
On 1/15/2022 8:55 PM, spudboy100 via Everything List wrote:
So earlier today I watched Sabine hassenfelder the physicist from
Germany indicate that any kind of wormhole travel or FTL is strictly
unlikely. What I'd like to ask is, whether all the work that's done
today for creating commercial nuclear fusion is more or less likely,
than using the same technology to develop fusion plasma rockets to
travel much more swiftly within the solar system? Our fusion plasma
rockets the lower hanging fruit, versus commercial nuclear fusion? Thanks!
------------------------------------------------------------------------
On Saturday, January 15, 2022 Lawrence Crowell
<everything-list@googlegroups.com> wrote:
It is possible for a binary star system to interact with a third star
so there is an exchange. We do normally expect binary star systems to
have similarly oriented angular momenta.
This is an interesting result. To compute this would have been tough.
This is a case of a Robinson-Trautman twisting solution or a twisting
type N. The addition of the two angular momenta results in the
occurrence of angular momenta perpendicular to the initial angular
momenta. This can be seen in with the classical group [L_i, L_j] =
ε_{ijk}|L|^2 n_k, for n_k a unit vector. This means there is the
emission of angular momentum in the gravitational radiation. The
calculation was most likely done numerically.
LC
On Thursday, January 13, 2022 at 1:13:02 PM UTC-6 johnk...@gmail.com
wrote:
On Thu, Jan 13, 2022 at 1:37 PM Brent Meeker <meeke...@gmail.com>
wrote:
/> Kudos to whomever did the calculation for this. But I
would have thought that most collisions would be misaligned in
both spin axes and impact plane. The Sun's spin axis isn't
aligned with the Milky Way's axis of rotation, so I had
assumed most stars have randomly directed spin axes./
Stars do have random axis of rotations in general but not if
you're talking about double stars, and the sun is rather unusual
in being only a single star, most stars are double stars, and they
were created at the same time from the same rotating cloud of gas
and dust and thus have similar axis of rotation, so when the
resulting stars turned into Black Holes they would also have
similar axes. And indeed most of the Black Hole mergers so far
detected by gravitational waves have been of that sort, but not
this one, that's what makes it so unusual. This system must've
been formed by two stars that formed at different places at
different times but then got close together and somehow went into
orbit around each other.
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
qbj
Brent
On 1/13/2022 3:49 AM, John Clark wrote:
For the first time a sort of gravitational wave rocket has
been found. By re-examining the data from the LIGO and Virgo
gravitational wave observatories researchers report on
January 6 they have detected the merger of 34 and 29 solar
mass Black Holes that resulted in a Black Hole of about 62
solar masses with about one solar mass being converted into
gravitational waves. What makes this merger unusual is that
it was not symmetrical, the axis of spin of the 2 black holes
were not aligned with each other and neither was aligned with
the axis of orbit around each other. This would indicate that
the 2 stars that form them (assuming these 2 large Black
Holes were actually formed from the corpses of dead stars)
were not born in an isolated system but probably came from a
denser environment like a globular cluster. Even more
interesting is that the misalignment of the spins means that
the gravitational waves emitted were not emitted
symmetrically, and gravitational waves carry some linear
momentum. So the resulting 62 Solar mass Black Hole must've
received a pretty substantial kick causing it to move pretty
fast, and that's just what the researchers found, because of
that kick the huge 62 solar mass Black Hole started moving at
least 700 km a second and probably closer to 1500. It's
probably moving fast enough to escape whatever galaxy it was in.
Evidence of large recoil velocity from a black hole merger
signal <https://arxiv.org/pdf/2201.01302.pdf>
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