Thread: Locus of the Earth and dark energy

The universe is non-static. It is expanding due to the presence of dark energy.
Dark energy exert repulsive forces.
Then if we consider the sun and the Earth, is the locus of the Earth around the sun static or non-static? Is the Earth getting away from the sun?
As gravity of the sun acting on the Earth = centripetal force of locus of the Earth around the sun,
Can we determine the amount of dark energy by considering the gravity and the speed of the Earth?

The Universe is expanding, with or without dark energy, from the Big Bang. All dark energy does is increase the rate of expansion.

What is the "locus" of the earth? There's no context I can think of where that statement makes any sense. Perhaps you can explain?

And the effects of dark energy are immeasurably small on the scale of a solar system, or even a galaxy, so that is irrelevant.

As stated - the effect of Dark energy on the scale of the solar system is negligible.


I recommend you read .......

Anything on Brans-Dicke theory [ Einstein on-line ]

The Dirac large numbers hypothesis

Surf around for
Scalar fields / Gravitational constant

At the scale of the solar system, or even the galaxy, gravitational attraction overcomes any tendency for expansion.

To use an analogy, imagine the universe as a tile floor, and its expansion represented by the tiles growing in size. Now imagine people standing on the floor in their stocking feet. As the tiles expand, the people will get further apart from each other.
Some people are close enough together to clasp hands. This is the equivalent of being gravitationally bound to each other. As long as their grip on each other is stronger than the friction between their stockings and the floor, they will not drift apart from each other as the tiles expand. In the same way, the Sun's gravitational grip on Earth keeps it from moving further away.

Tim, you my friend are bang on the money. Think of gavity as are magnetic field aswell, look into the atom attraction and repultion physics and you are on the right path to discovering what dsrk matter is.

Andy, since I seriously doubt that you are the lone person out of seven billion humans who understands what dark matter is, I doubt you know whether or not Tim is on the right track. Here is a clue - he isn't and you aren't.

What is our current explanation for dark energy?

Originally Posted by guymillion

What is our current explanation for dark energy?

We don't have one. One hypothesis is that empty space has some amount of negative energy associated with it; as space expands the amount of negative energy increases and accelerates the expansion. Another is a new fifth force ("quintessence"). Yet another suggestion is that the apparent acceleration is caused by some sort of measurement bias. And there are others ...

strange what you say there about black matter being the unknown negative energy increasing in size and speed, its a repelling force stretching the unknown which is in everything. we are literally moving with time. the only difference with us is that we have a sun close by providing life that has to addapt to the expansion and a huge generator in the middle and as a result of this we have an emf sending current through everything that is voltage.

Originally Posted by andythomasthekey

strange what you say there about black matter being the unknown negative energy increasing in size and speed

I didn't mention "back matter" (whatever that is). What does "energy increasing in size and speed" mean?

its a repelling force stretching the unknown which is in everything. we are literally moving with time. the only difference with us is that we have a sun close by providing life that has to addapt to the expansion and a huge generator in the middle and as a result of this we have an emf sending current through everything that is voltage.

That makes no sense.

Yer I did go off on one, I need some ZZZ's and a laptop rather than a crappy tablet to put my case forward in the queens own, or a plug iin keyboard.

Andy, please stop posting in this thread. You have your own to talk about your silly ideas in. This is just a friendly request for now.

sure, just delete them, it is off topic.

dark matter and dark energy are theoretical constructs
dark matter is assumed to fill up 25+% of the universe
dark energy is assumed to fill up 70+% of the universe
and you, me and everything we can sense or see is the other matter and energy which we can measure
wowie zowie, we're down to a measly 2-5%
for every bit of matter we know of, there is assumed to be 10 times that much dark matter
inhale 1 part air and 10 parts dark matter

we have mathematical formula that predict dark matter
which we cannot see, sense, nor measure
but it does explain why galexies tend to be in clusters, and why light from distant galaxies can be seen to bend around a spherical shape surrounding a galaxy cluster-------so dark matter seems to hold things together and create structure(yippee)

dark energy on the other hand has no good explanation/formulation and is said to be like no energy we know of
but
it does explain why the seeming expansion of the universe seems to be accelerating, while BB would predict that the expansion should be slowing (if we understand the greater actions of what we classify as gravity
so it is given the assumption of being 75+% of the known universe-----so dark energy seems to push things apart dissipating structure---( ... )
............
dark?
how about mysterious postulated energy and/or matter
........................
........................
(imagined conversation concerning the birth of "dark matter" and "dark energy")

"there is something ---matter? energy? there/here and i got no way of measuring it and it ain't doing anything in the observable electromagnet spectrum
but
gee
if my current theories are accurate, then it's just gotta be there"
"lets call it god"
"nah that one's already been taken"
"ok how about mysterious unknowns?"
"nah------hmm----how about 'dark' dark is always sexy"
"ok,....dark it is"

................
if you believe in things you don't understand
that's superstition
but then again,
i could be wrong

(inhaling)

Originally Posted by sculptor

dark matter and dark energy are theoretical constructs

The word you are looking for is "hypothetical".

i could be wrong

In the absence of any other evidence, I'll go with that.

just a name given to the unknown, there could be more unknowns in a small pocket of dark matter than there is visible matter as far as the eye could see

Is there an explanation for why the strong and weak nuclear forces only act on extremely small distances as opposed to something like gravity or dark energy?

Originally Posted by guymillion

Is there an explanation for why the strong and weak nuclear forces only act on extremely small distances as opposed to something like gravity or dark energy?

I think this is one of the big unanswered questions in quantum chromodynamics.