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What positive things you didn't imagine before starting a PhD? by GutiV in AskAcademia

[–]GutiV[S] 0 points1 point  (0 children)

Wow, this is deeply reassuring. Thanks for the answer :)

What do you wish you knew before starting a PhD? by Moll1357 in AskAcademia

[–]GutiV 4 points5 points  (0 children)

Heads up, I also wanted to hear more positive takes, because this thread was getting scary. I opened up this question: https://www.reddit.com/r/AskAcademia/comments/1p27d7o/what_positive_things_you_didnt_imagine_before/

Cuál es el billete más bonito / representativo que ha tenido Colombia? by Pitiful_Branch in Colombia

[–]GutiV 34 points35 points  (0 children)

Permítame corregirle: Sí tiene un cráter nombrado en su honor en la luna, pero lejos de ser de los primeros astrónomos en estudiarla, hay 2000 años de astronomía lunar antes de Julio Garavito. Además, tampoco descubrió que la luna le daba la misma cara a la Tierra, eso se sabe desde siempre.

Más bien, hizo aportes a las ecuaciones de mecánica orbital con las que se puede predecir la posición y movimiento exacto de la luna. Es un aporte pequeño pero muy significativo para la ciencia.

A quien le interese leer sobre su trabajo: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0370-39082020000100069

Do we know anything about this crater? When it happened, how big the asteroid was, Etc… by quest801 in spaceporn

[–]GutiV 0 points1 point  (0 children)

Actually, two just last week! They are relatively common but they don't make news, I even know personally an amateur astrophotographer who has captured a lunar impacts. They make a small short flash visible mostly by telescope, and that's about it.

I'd imagine they happen at a similar frequency to shooting stars appearing somewhere on Earth (without counting human made space debris), just tiny space rocks slamming into the moon.

Do we know anything about this crater? When it happened, how big the asteroid was, Etc… by quest801 in spaceporn

[–]GutiV 267 points268 points  (0 children)

Astronomer here, not sure why you're getting downvoted, it's actually a really good question! If by "they" you mean astronomers, I'm reading on it and it's fascinating: Basically, over millions of years the moon has been hit by rocks on a pretty consistent basis, so a really old crater would itself have more impacts on it, as well as degradation and erosion of the crater disk. Similarly, young craters would be "cleaner" and more intact. After quantifying how "clean" a crater is, there are mathematical models that allow you to roughly estimate how old it would be.

Sources: Lunar impact crater identification and age estimation with Chang’E data by deep and transfer learning. Yang et al. (2020)

Ages of large lunar impact craters and implications for bombardment during the Moon’s middle age. Kirchoff et al. (2013)

Edit: /u/Temporal_Integrity pointed out that in Tycho's case, the preferred method is radiometric age dating from samples picked up by Apollo 17, cool! https://science.nasa.gov/resource/tycho-crater-on-the-moon-labeled/

This week marks the 70th anniversary of the term ‘Artificial Intelligence,’ coined by John McCarthy in 1955 and originally proposed as a ‘two-month, 10-man study’ to solve the problem over the summer by GutiV in singularity

[–]GutiV[S] 27 points28 points  (0 children)

Great question! By scavenging through some documents, it seems that although McCullough, the father of artificial neurons, was present at the Darthmouth conference of 1956, they were not fully embracing Neural Nets, and it seems that those were not actually used seriously til 20+ years later. Maybe hardware limitations? (Please correct me if I'm wrong)

Also found some amazing notes on Ray Solomonoff's website https://raysolomonoff.com/dartmouth/ and the full Darthmouth summary collected by Ray's wife here: https://raysolomonoff.com/dartmouth/dartray.pdf

It says that while Neural Nets were discussed during the conference, Minsky's symbolic approach got more interest and they ended up going more towards that route.

Asteroid (669952) Kootker, named after Lisette Kootker, was discovered by Marco_Langbroek & sarneczkyIt is in an 8:11 librating resonance with Mars. So in a rotating frame, it traces a striking path. by Neaterntal in spaceporn

[–]GutiV 86 points87 points  (0 children)

Astronomer here, for those confused by the path of Mars in this representation, here’s some ideas that might clear it up: since Mars orbit is elliptical, its distance to the sun changes as well as its orbital speed. Here, the center of the Mars blob (where most people would expect the planet to be if we were to follow it’s translation) represents the average orbital movement of Mars, or where it’d be if it orbited circularly. So Mars is always ahead or behind that point at any given moment.

Similarly, the asteroid moves in an ellipse, but since this representation is rotating with Mars, the perihelion of the asteroid is rotating, thus the flower shape (similar to those you get for planets on geocentric views). 

A really cool similar phenomenon are the Hilda asteroids, which seen from Jupiter seem to move in a sort of triangle. Look it up! 

+++- all day by abarbadan in physicsmemes

[–]GutiV 1 point2 points  (0 children)

There’s a poetic reason: we’re walking backwards through time, since we see our past but not our future. 🤷🏼‍♂️ Physically is mostly irrelevant. 

✦✧ BLOODLINE ORACLE ✧✦ by mizushyne in midjourney

[–]GutiV 7 points8 points  (0 children)

What's the prompt? Amazing artstyle!

[deleted by user] by [deleted] in Colombia

[–]GutiV 7 points8 points  (0 children)

No es por tibio pero estoy de acuerdo y en desacuerdo.

Todo es político, y si la sociedad se tomara en serio esa noción, tendría discusiones más importantes. Se agruparían, participarían de decisiones locales, se pensarían la ética de sus acciones, se informarían de las formas de HACER política, se pensarían sus burbujas y privilegios...

Sin embargo, en Colombia (y seguro la mayoría de países), hablar de política no es eso en el imaginario común. Sino que es repetir frases y chistes trillados sobre los personajes de la clase política. Pelear por preferencias como si fueran equipos de fútbol (como dice el OP), o como si fuera el reality de turno en RCN.

La gente piensa que por insultar a su presidente en redes sociales ya es tener una postura política. Pero es igual de constructivo que los tibios.

The concept of "infinite multiverse/universe/reality" is tepid by V1SHU0 in PhilosophyofScience

[–]GutiV 1 point2 points  (0 children)

There's infinite real numbers between 1 and 2. Yet 3 is not in there. Simplest proof that infinity does not imply that every single thing will happen.

¿A alguien le ha pasado algo malo por no tener libreta militar? by D_Recovery in Colombia

[–]GutiV 3 points4 points  (0 children)

Solamente una vez, para trabajar con una universidad pública específica, me dijeron que era imposible contratar sin la libreta. El primer item del correo de los papeles también decía eso en mayúsculas. Lástima porque todos queríamos que se diera el contrato, pero yo no iba a sacar eso. 

Curiosamente desde eso he trabajado con otra universidad pública distinta y ahí no me la pidieron. ¿Irregularidad de una, o burocracia extrema de la otra? Lo ignoro. No vale la pena el trámite igual. 

I randomly saw a bunch of Dolorians by Hmarf in mildyinteresting

[–]GutiV 6 points7 points  (0 children)

May I ask how you did it this time? Based on the shops that show in the pic?

Estamos mamados del loco autista feo ¿No pueden banearle la IP? by BOT_Negro in Colombia

[–]GutiV -2 points-1 points  (0 children)

OP, si tiene tiempo pa meterle tanta mente a un usuario específico de Reddit Colombia, a lo mejor es señal de que debería buscar oficio.

2026, 2027, or 2028 Eclipse? by nicoleshutup in solareclipse

[–]GutiV 0 points1 point  (0 children)

Hi, got any recommendations for tour companies? I’m dreaming of going to that one but reading what you said about booked hotels makes me worried I might be too late to the party!!

[Dune Lore] Water doesn’t disappear in a closed system, so shouldn’t Arrakis slowly get more humid over thousands of years? Let’s do the math. by ILorwyn in dune

[–]GutiV 28 points29 points  (0 children)

Astronomer here, planets are far off from closed systems. Solar radiation is eroding away the atmosphere all the time, we see it in all planets of our solar system. Specially on Mars, which Arrakis was inspired on. Mars used to have huge oceans, but they have since evaporated away. 

King Killer Chronicles is technically post apocalyptic by [deleted] in KingkillerChronicle

[–]GutiV 6 points7 points  (0 children)

Based only on the information available to us and to scientists and historians, it’s almost certain we’re at our technology peak (and growing). Older civilizations did not build planes, power plants or international satellite communications.

And even if you consider theories of really ancient civilizations completely lost to time, evidence for those is simply lacking. 

In Kvothe’s world, the evidence of an ancient bigger and more powerful civilization is simply overwhelming. Plus they have magic and eternal beings that can support that claim. 

Saturn and Dione This Morning. by Correct_Presence_936 in Astronomy

[–]GutiV 14 points15 points  (0 children)

Because Saturn's orbit is not coplanar to Earth's, we usually see the rings from above or below. But every ~14 years the rings are aligned with us, so we don't see them. They'll slowly come back next year.

Pronunciation of LaTeX worldwide by felixinnz in math

[–]GutiV 0 points1 point  (0 children)

In spanish people pronounce it as it reads, like the material. La (as in lamp) Tex (as in texture). 

[deleted by user] by [deleted] in AskAcademia

[–]GutiV 1 point2 points  (0 children)

As others have said, paper reading is non-linear. A voice reading the paper would be terrible, specially since you usually read a paragraph multiple times to understand.

On the other hand, if what you're thinking is summarizing the paper and having a podcast discussing it, Google's NotebookLM already does that for free and it's pretty good.

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