ryschwith

ryschwith t1_iwrmape wrote

That’s still the case (the Bullet Cluster is frequently brought up here) and is generally where every “what if dark matter isn’t matter” theory falls apart. I don’t really understand this particular theory enough to say whether or not it resolves this.

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ryschwith t1_iwqdso9 wrote

I think what I want here, before forming an opinion on it, is a better idea of what “information” means in this context. I get the impression it’s more closely related to entropy than to “this collection of bits is a cat GIF” but I’d like more clarity.

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ryschwith t1_iuubsfz wrote

A few additional details to put your mind at ease:

> As things stand, 2022 AP7 crosses Earth’s orbit. This makes it a potentially hazardous asteroid, he said. > However, the crossing occurs at a time when the Earth is on the other side of the sun, he explained, adding that this configuration will continue for the foreseeable future.

(emphasis mine, source: https://www.euronews.com/next/2022/11/02/dont-look-up-astronomers-detect-planet-killer-asteroid-2022ap7-that-could-threaten-earth#:~:text=Planet%20killer%20has%20'no%20chance,Euronews%20Next%20in%20an%20email.)

Also, this kind of thing is why we had the DART mission and what will no doubt be numerous follow-up missions.

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ryschwith t1_iujq1jr wrote

Despite most of the responses you’re getting here, you’re not wrong. This alone doesn’t explain the emptiness of the Universe but it’s certainly a factor. Detecting alien life isn’t just a matter of looking in the right direction, it also requires looking at the right time.

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ryschwith t1_iujo9ah wrote

The term’s a bit loose. Taken literally it applies to pretty much every crop we grow today, as you said. When it shows up in public discourse though people generally mean a narrower definition: crops specifically modified through gene editing technology like CRISPR.

It gets talked about because people are skeptical of the safety of such methods compared to “traditional” generic modification methods like selective breeding. (Whether those fears are well-founded is a different issue.)

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ryschwith t1_iu13124 wrote

Well, I can tell you that a scalar field means that the field only has a field strength value at any given point; as opposed to a vector field which has a field strength value and a direction. Think about a magnetic field and you have some idea of what a vector field is.

I can also tell you that “spin” is a quantum property of particles. It’s like angular momentum but not exactly angular momentum. We don’t really understand what it is so we call it spin because that’s a close enough analogy to let us reason things out about it.

I don’t understand enough about quantum fields in general or the Higgs field in particular to tell you what the significance of it being a spin-0 scalar field would be.

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ryschwith t1_iqrfk4k wrote

Mostly I remember it being kind of a shitshow until suddenly it wasn’t. Cost overruns, technical difficulties, schedule problems. Then they finally get it into space and it can’t even focus right because they messed up the mirror. It—and NASA—was something of a joke at the time. Lots of questioning of why we spent so much money to take fuzzy star pictures.

And then they figured out a few algorithms to deal with the focus issues, the deep field photo came out, and suddenly everyone was (deservedly) big fans.

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