2025 represents a very important year in US demographics. 2025 is 18 years from the great recession, and every single year since that date has seen a near continuous decline in US births.
That means, every year going forward, there are going to be fewer students going to colleges, few recruits for the military and fewer workers for employers. This is not a small thing coming very quickly. #demographics#babies#genalpha
We’re back with#formation and #demographics this morning starting with Charles Law on embedded planets.
Charles stresses how much #ALMA has revolutionised the field providing a wonderful pictures of discs. Nevertheless, resolving planets embedded in these discs is pretty hard. But chemistry is our saviour, making signatures of the planet observable with #ALMA.
We start with the disc HD 169143 b - funny I worked with data from this disc for my bachelor’s thesis.#ExSSV
In this disc, there is a protoplanet! - so a baby planet 👶 🪐 and they trace it ALMA data and chemistry, note the asymmetry in the emission due to the planet. They put together SiS and SO: SiS appears blueshifted.
In addition, they also detect CO (12/13). Let’s put it all together!
The detection of SiS indicates shocks, and outflow of the planet because of the observed shift.
Take away: Si and S bearing molecules provide a new way for us to study protoplanets. More to come!! #ExSSV
Next up, we’ve got Kristo Ment talking about planet occurrences for mid-to-late M dwarfs from TESS.
you may find this as surprising as I do, but M dwarfs are the most common stars!
Let’s talk #demographics: despite having smaller protoplanetary discs, (early) M dwarfs seem to be forming more planets than others.
In Kristo’s work, they study late M dwarfs to see if this trend continues and what the radius mass relation looks like. There are 7 detected planets in this sample #ExSSV
@GregCocks There have been a couple of TV shows. This is the advert for one from 3 years back gives a good history of the area. The full film doesn't seem to be available: https://vimeo.com/454783961
@cs
I'm not sure how I feel about region- or natl-level sex ratios at birth being characterized as "just boring numbers" and "long dry columns of population statistics" lol - but a very very neat and interesting piece
#Demographics is #nationalism on steroids - the racist Great Replacment theory incites pronatalism in times where young people increasingly have doubts about giving birth to children that will grow up in a world of chaos and destruction.
Criminalizing #abortion is not enough, to secure White supremacy and the rule of #patriarchy the cycle of generational reproduction has to shift into high gear subjugating female bodies to work and war regimes.
"In the broadest sense, the Republican-appointed justices have moved to buttress the affluence and status that allow white people to wield the most influence in society, and to diminish the possibility that accelerating demographic change will force a renegotiation of that balance of power. "
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