article

cross-post from[ [email protected]](https://lemmy.world/post/17310571) https://lemmy.world/post/17310571

The way i read it : Our theoretical framework, allowing matter creation (*) provides a possible origin for the universe (without the need of a Big Bang). Also this is quite timely in the actual context of new observations made by the James Webb space telescope that are in tention with classical models.

(*)(after an hypothetical inflatory period, [...or at any time as long as the universe expands...])

title of this post is taken from section : VII. SUMMARY
Of : Cosmological Particle Production: A Review

Preprint :
(2021 December 7 // @ arXiv…)
https://arxiv.org/pdf/2112.02444.pdf

The article has been published in a peer reviewed journal paywall warning.

time for big bang revision

Lemmyversers, I'm looking for some help developing a new mnemonic device.

Inspired by a video by Epic Spaceman, where he explains a handy system for comparing the size of things from a banana to an atom, I’ve come up with a mnemonic device to aid in remembering these scales.

He lists items, each smaller than the previous by a factor of 10:

It goes:

• Banana
• Coin
• Edge of the coin
• Waterbear/microorganism
• Red blood cell
• Bacteria
• "Good virus"/Bacteriophage
• Corona Virus/"Bad Virus"
• DNA
• Atom

So a coin is roughly 1/10 a banana, and the edge of that coin is roughly 1/10 the size if that coin.

It gives good references for thinking about other things if similar size. A sort of banana for scale at each factor of 10.

And allows you to quickly determine approximations like Covid is roughly 1000 times smaller than a red blood cell. Or an atom is roughly 1 billion times smaller than a banana. (That doesn't sound right. Is that actually right?)

Do you think that's a useful memory tool? And are these best touchstones for scale at each level?

The mnemonic I've come up with for it as you may have guessed, is:

• Be
• Cool
• Even
• When
• Really
• Big
• Goblins
• Casually
• Drop
• Acid

Do you have any better ideas or tweaks you"d recommend for the mnemonic or the touchstones?

Would this be helpful when trying to wrap your head around the scale of the micro?

Also, what would make for a good macro version of this? Where everything got bigger by a factor of 10?

nice color pics from far-side, Chang’e-6

The frequency and magnitude of extreme wildfires around the globe has doubled in the last two decades due to climate change, according to a study released Monday.

The analysis, published in the journal “Nature Ecology & Evolution,” focused on massive blazes that release vast amounts of energy from the volume of organic matter burned. Researchers pointed to the historic Australia fires of 2019 and 2020 as an example of blazes that were “unprecedented in their scale and intensity.” The six most extreme fire years have occurred since 2017, the study found.

Even as a flying squid, I'm repulsed.

humans must be optimized for hand tools and short life spans.

The latest insight comes from a study on butterflies in the Midwest, published on Thursday in the journal PLOS ONE. Its results don’t discount the serious effects of climate change and habitat loss on butterflies and other insects, but they indicate that agricultural insecticides exerted the biggest impact on the size and diversity of butterfly populations in the Midwest during the study period, 1998 to 2014.