will_a113Astronomer Claims 'Direct Evidence' of Gravity Breaking Down
A scientist has observed a “gravitational anomaly” in certain star systems
Seems like the opening to a Star Trek episode
A warp drive is one of the few innovations that might save humanity from our current peril, here’s hoping
Huh, why do you think that? Why would faster than light speed technology have a different impact on society than our current space technologies? (Assuming we don't encounter aliens)
I mean we’d all still be fucked but a generation ship could give hope to the survival of the species as a whole
We haven't even gotten people to Mars and it would "only" be a couple of year trip with current technology. I can't imagine society making a generational trip happen any time soon.
I mean society as a while sure won’t, but desperate times and all that, unlikely for sure but it’s a glimmer
If humanity has proven anything it’s that technology tends to make things worse.
dark matter is not a theory
dark matter is not a theory.I tried to increase the sound on this---let me know how it went? I keep getting comments that my sound is too low but it always s...
Don’t need to hate dark matter to appreciate both theories have their positives and their hold ups. There’s forces at work that we don’t understand, one camp poses we can add an unknown mass to make things work, the other poses we can add an unknown modifier to a force to make things work. Neither theory works perfectly, neither theory has (of yet) an identifiable mechanism. I don’t know how this is a divisive issue, there’s legit scientific practices happening from both camps.
I subscribe to Sabine Hossenfelder’s take on things, “the distinction between dark matter and modified gravity is a false dichotomy, the answer isn’t either or, it’s both, it’s just a matter of how do we combine them” 2 years ago in this video. youtu.be/4_qJptwikRc
Dark Matter: The Situation has Changed
I just watched that video somewhat recently and couldn’t understand that quote. There are a number of MOND models that literally don’t involve dark matter at all – no new particles added, no unexplained masses needed. So in that case, wouldn’t “how we combine them” just be “set dark matter to 0 and use this different set of equations to solve for gravity in certain circumstances”?
The MOND models are less accurate than cold dark mater models. As long as MOND fails to explain current phenomina, cold dark matter wins. Period.
I hate this title, even though it’s a good article. It’s nothing to do with gravity “breaking down”; maybe oul the current THEORY of gravity breaking down. So annoying that titles need to be sensationalized.
ChetzemokaWell, it is a direct quote from the study, so maybe not the journalist's fault this time:
"direct evidence for the breakdown of standard gravity at weak acceleration” and reveal “an immovable anomaly of gravity in favor of MOND-based modified gravity"
jorgeSo it would be a breakdown of standard gravity, not of gravity full stop. Sensationalized headline.
Yeah, a better title would have been “new observations show gravity anomaly indicating that current dark matter theories are incomplete”, but you get fewer clicks with something like that, right?
Huh, this is interesting. I found a slightly more in depth article on this: universetoday.com/…/evidence-for-modified-gravity…
It’d be amazing if this actually led to something MoNDish being the prevalent theory of gravity. Wouldn’t that essentially explain dark matter?
Evidence for Modified Gravity Found in the Motions of Binary Stars
There are two leading explanations for dark matter, massive particles that don't interact with regular matter apart from gravity and a subtle difference in how gravity behaves at large distances. Astronomers have studied the interactions of over 20,000 binary stars with wide orbits cataloged in Gaia data. They found that orbital accelerations of the stars match the predictions made by modified Newtonian gravity and provide compelling evidence for the MOND hypothesis over the dark matter being a particle.
It could explain the observations of the orbits of stars around galactic centers that currently can't be explained (stars move faster than current models predict), yes. It would be an alternate explanation for this anomaly than dark matter, which is the other proposed "if this exists, it would explain what we see" hypothesis.
Michael 🇺🇦@will_a113 I guess that I will wait for a summary by Dr. Becky.
@will_a113 BTW: In her monthly video she already announced that there will be a video about this in the coming days.
I’ve read 3bp…shit
your mom.
I found an article that’s more skeptical bigthink.com/…/binary-stars-prove-modified-gravit…. I’m no expert but it does make a good case for why this result might be suspect
