What if the aliens were just polite but didn't bother about us?

[XCV330]

Nope. The standard model says nothing definite about the nature of dark matter nor does it predict its existence. Dark matter might be composed of axions; then again it might not. We just don't know.

Comparing gravitational radiation with EM radiation is not terrifically useful - it's unlikely we'll ever be able to throw enough mass around to generate detectable gravitational waves.

Dark matter must exhibit gravity, even if it is non baryonic because it has mass and interacts with the universe. The whole reason for it's theoretical existence is due to the missing mass that must explain velocities that otherwise would not make sense.

If it exists, of course.

 

[Asbo Zaprudder]

Dark matter must exhibit gravity, even if it is non baryonic because it has mass and interacts with the universe. The whole reason for it's theoretical existence is due to the missing mass that must explain velocities that otherwise would not make sense.

If it exists, of course.

I didn't say that dark matter didn't exhibit mass. That would be ridiculous. I said the standard model says nothing about dark matter at all, which it doesn't. The velocity discrepancies in galactic rotation have nothing to do with the predictions of the standard model. You are conflating different things.

Even though the Standard Model is currently the best description there is of the subatomic world, it does not explain the complete picture. The theory incorporates only three out of the four fundamental forces, omitting gravity. There are also important questions that it does not answer, such as “What is dark matter?”, or “What happened to the antimatter after the big bang?”, “Why are there three generations of quarks and leptons with such a different mass scale?” and more.

https://home.cern/about/physics/standard-model

Dark matter candidates arise frequently in theories that suggest physics beyond the Standard Model, such as supersymmetry and extra dimensions. One theory suggests the existence of a “Hidden Valley”, a parallel world made of dark matter having very little in common with matter we know.

https://home.cern/about/physics/dark-matter

 

[Santaman]

Like antimatter every matter matters..

As for the aliens ignoring us.. OF COURSE THEY DO, I mean come on, the second they see some agressive primates with nukes they know very well to stay the hell away!.

 

[YellowSubmarine]

I'm a simple guy. I put my money that sterile neutrinos exist, are more numerous and heavy than garden variety neutrinos (savour the oxymoron), and make up dark matter, and that's it.

 

[Qonundrum]

Colonialism is only good for dinosaurs, if they didn't move about what would they do? If humans didn't explore their own planet they wouldn't be interested in others. What's to do on the moon anyway? Apart from putting up amusement parks simulating the moon. There's this doco I'd seen once... here it is:

Spoiler

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I thought you meant a wall, a glorious yuge galactic wall

You mean what's talked about in this news clip piece? (If politicians can agree on specific issues, what's the beef? I'm confused. I've seen longer versions (sounds like a reasonable set of solutions she brings up) of it, too. Even from other politicians in the past. It's an issue that has not changed in relevance between the 1990s (or earlier) and now or else it wouldn't be an issue. Is there a reason to hate it now when the same thing happened then and people liked it then?)

 

[Gingerbread Demon]

Colonialism is only good for dinosaurs, if they didn't move about what would they do? If humans didn't explore their own planet they wouldn't be interested in others. What's to do on the moon anyway? Apart from putting up amusement parks simulating the moon. There's this doco I'd seen once... here it is:

Spoiler

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You mean what's talked about in this news clip piece? (If politicians can agree on specific issues, what's the beef? I'm confused. I've seen longer versions (sounds like a reasonable set of solutions she brings up) of it, too. Even from other politicians in the past. It's an issue that has not changed in relevance between the 1990s (or earlier) and now or else it wouldn't be an issue. Is there a reason to hate it now when the same thing happened then and people liked it then?)

I wasn't talking about the stupid border wall, I was commenting on the question of whether by design our solar system has been quarantined to stop us getting visitors or limit them?