Archive for May 2nd, 2020

A Planet Here Today and Gone Tomorrow

May 2, 2020

The universe is certainly more alive than we ever expected it to be. Lots going on. Interesting considerations in the essay reproduced below, from Dr. Ian Miller for (the lack of life) inside Europa… (Well then so much the better, we can engineer our own… Having the largest ocean in the solar system below our feet will help in many ways…)

At least one asteroid to asteroid collision was observed in the solar system: we have a movie of it!

https://www.nytimes.com/2019/11/26/science/asteroid-belt-impact.html?action=click&module=RelatedLinks&pgtype=Article

The New York Times, in The Case of the Disappearing Exoplanet (Fomalhaut b was one of the first planets around another star to be directly imaged by telescopes. Some astronomers now say it was a cloud of asteroid debris.)… showed the movie of the apparition and disappearance of the Fomalhaut b “planet”, from Hubble pictures. It really looks like an explosion…

Exoplanet PSEUDO Formahaut b

This is the pseudo-exoplanet, lower right, circa 2006, as seen by Hubble High Resolution. The star itself is hidden by a (man made device inside Hubble). The dust ring is fully visible. The movie of the situation shows the yellow dot expanding in a big orange, then deep red explosion…

And the cloud took a decade to dissipate, just as theory predicts.

Regarding the essay of the honorable Dr. Miller reproduced below, I beg to differ on one point, as I don’t see why standard gravitation theory doesn’t predict planet accretion (but that’s science in accretion: theories differ…)

First the mass of a dust cloud could be many solar masses. It collapses under its own gravity. At it does, the slightest rotation is converted, through angular momentum conservation into a massive rotation of a disk… This star system formation theory comes from Laplace. The same rough picture applies to form galaxies… and planets! If a cloud shaped as a doughnut is the mass of Jupiter, even if in orbit, around a star, it will end up collapsing on itself, from some irregularity… and the rotation on itself, in the correct sense will be generated from the orbital motion (as observed!… mostly).

The cloud around the star doesn’t have to be even, nor does the disk then, hence haphazard planetary mass distributions (as observed). However one would expect more mass towards the center… Thus Jupiter-like planets to be towards the center (as observed: the “hot Jupiters”)… As the central mass becomes a star, radiation pressure enters the mix. So one would then expect many of the hot Jupiters to be torn apart, losing their gas 9except for hot Jupiters which are massive enough!), leaving rocky planets behind (as observed), or then that rocky planets would form towards the interior from sinking of the densest elements (as observed).

Right, these are contrary, alternative scenarios. However, stars are not all the same, thus neither are radiation pressures: a tiny red dwarf (75% of stars) is nothing in common with a blue supergiant (a future supernova).

In any case, exciting days. Instead of propping up the useless and degenerate non-essential economy, the frivolity of which the Corochinavirus is thoroughly demonstrating, to my great satisfaction. Instead, humanity should do something really useful, and build a 200 meters across telescope… there are lots of questions about the Centauri system, including that of the exoplanet closest to Earth, apparently a sort of super-earth… Is it alive? Inhabitable? First we should find out how big it really is…

ianmillerblog

Or, a record for the biggest thing lost! Or, to loose your car keys is careless, but to lose a planet??

As some readers will know, I have my own theory of how planets form from the dust of the accretion disk around stars. The dust is actually micron sized, and finer than an average smoke distribution, and as the gas falls into the star, it gets hot, its potential energy lost being converted to heat, and when it gets hot enough it glows. Of course, it also glows by scattering light emitted by the forming star hence we observe those disks. Standard theory assumes planets form through gravity. The problem here is gravity is far too weak to aggregate this dust, so the standard theoryassumesthat somehow it forms planetesimals and there is an even distribution of these out to about 32 A.U. (one A.U. is the Earth-Sun…

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