#astronomy
So, I have access to ChatGPT-4o now. So far, so... mixed.
Q : Could you tell me a little bit about this paper: https://arxiv.org/abs/2312.03601
[This is the one I posted yesterday]
A : Generic though not inaccurate response, except for : "The authors, led by Jonathan H. C. Rhee..."
This is not one of the authors. The first author is Xiao Li. Let's skip the boring and unhelpful discussion as to why it came up with this and get to the science.
Q : Can you spot any inaccuracies in the paper?
A : Identifying inaccuracies in a scientific paper requires a thorough understanding of the subject matter and often involves detailed analysis and peer review. If you have specific aspects of the paper you want to investigate for potential inaccuracies, I can help by examining those areas closely or by summarizing relevant findings from the text.
[Oh, thank you so much, how helpful !]
Q : Well that's why I'm asking you. Consider the major message of the paper and see if there's anything they present that contradicts this. Pay special attention to the appendix.
A : Long-winded generic answer about all the usual concerns about sample selection, data quality, statistics, etc., the kind of stuff that's true about literally every paper, e.g. " The authors could have provided more detailed explanations or additional analyses to support their conclusions, particularly when claiming the uniqueness of certain galaxy properties."
[Well, duh.]
Q : I'm asking if the paper makes any specific claims which are contradicted by other statements they make. I don't mean that their data might not be of the best quality or their methods flawed, I mean specific, direct contradictions.
A : Upon closely examining the paper "On the existence, rareness and uniqueness of quenched Hi-rich galaxies in the local Universe" and its appendix, one specific contradiction stands out:
Main Claim:
The paper's major claim is that they have identified a sample of quenched (i.e., no active star formation) yet HI-rich galaxies (referred to as RR galaxies) and that these galaxies are rare and unique in the local universe. The study emphasizes the rareness of such galaxies by comparing their HI richness to that of typical quenched galaxies, which are usually HI-poor.
Contradictory Statement in the Appendix:
In Appendix A, where the authors present optical images of the selected RR galaxies, they show the HI-to-stellar mass ratios for these galaxies. The paper discusses these galaxies as being "red but HI-rich." However, upon closer inspection of these images and the related text, it becomes apparent that some of the galaxies display features that are inconsistent with a fully quenched status. Specifically, some images suggest the presence of spiral arms or other structures typically associated with ongoing star formation, which contradicts the classification of these galaxies as fully quenched.
Bam. Perfect. Especially because the authors themselves do not remark on this. The damn thing can't read a bloody author list but it can spot features inconsistent with quenched galactic star formation. Thoroughly odd !
#AR3664: Giant #SunspotGroup
#Astronomy #Picture of the Day
Research discussion--The #Secrets #of the #GreatPyramid - #Randall-Carlson - Think Tank - E28
In this episode of Think Tank, Robert hosts #RandallCarlson, a master builder, geometrician, architectural designer, teacher, and "renegade scholar." With over forty years of studying #ancient #mythology and modern #science, #Carlson has been recognized by the National Science Teachers Association for his commitment to science education. His career includes organizing field expeditions to explore and document evidence of catastrophic earth changes. Carlson's life and work emphasize his aspiration to "affect a revival of lost knowledge."
In their relaxed yet insightful conversation, Robert and Randall share their research and ideas, exploring the mysteries of the #Great #Pyramid, sacred geometry, and the intricate relationship between #architecture, #astronomy, and music. Robert highlights the importance of #Metatron's #Cube in understanding ancient structures and demonstrates how the #King's #Chamber walls align with #constellations.
Their discussion uncovers how the #pyramids' geometric layout aligns with musical intervals and astrological constellations, providing a glimpse into sacred geometry and ancient wisdom. They also delve into ancient measurements like the long cubit, the relationship between Euler's identity and light, and the golden ratio. They offer a compelling look into the esoteric knowledge encoded within pyramids and ancient manuscripts. Their casual yet profound dialogue lays the groundwork for future collaborations, capturing the early days of a promising friendship.
The #Galaxy, the #Jet, and a Famous #BlackHole
#Astronomy #Picture of the Day
"NASA's Deep Space Optical Communications technology demonstration continues to break records."
267 megabits per second at 31 million kilometers, 25 megabits per second at 226 million kilometers (about 1.5x the Earth-Sun distance). Other than saying "near infrared" and done with lasers, they don't say what wavelengths are used or how exactly it's done. I guess they have sensitive photon-counting camera and laser transmitter plugged into a telescope on the spacecraft (called Psyche), and on Earth they have a receiver near JPL that also can send up a "beacon" laser that gives the telescope on the spacecraft something to lock on to.
"NASA's optical communications demonstration has shown that it can transmit test data at a maximum rate of 267 megabits per second (Mbps) from the flight laser transceiver's near-infrared downlink laser -- a bit rate comparable to broadband internet download speeds."
"That was achieved on Dec. 11, 2023, when the experiment beamed a 15-second ultra-high-definition video to Earth from 19 million miles away (31 million kilometers, or about 80 times the Earth-Moon distance). The video, along with other test data, including digital versions of Arizona State University's Psyche Inspired artwork, had been loaded onto the flight laser transceiver before Psyche launched last year."
"Now that the spacecraft is more than seven times farther away, the rate at which it can send and receive data is reduced, as expected. During the April 8 test, the spacecraft transmitted test data at a maximum rate of 25 Mbps, which far surpasses the project's goal of proving at least 1 Mbps was possible at that distance."
NASA's optical comms demo transmits data over 140 million miles
A #TotalSolarEclipse from Sliver to Ring
#Astronomy #Picture of the Day
https://apod.nasa.gov/apod/ap240506.html
https://www.youtube.com/watch?v=28gtfSziCgU
