Navigating the Cosmic Currents: The Great Attractor

Astronomers and astrophysicists are fascinated by the deep mysteries that lie beneath the cosmic tapestry, which is made up of galaxies, clusters, and the vast emptiness of intergalactic space. The Great Attractor stands out among these celestial mysteries as a cosmic giant, a massive object with a gravitational pull that is located outside the observable boundaries of our universe. This massive mass concentration exerts a force that defies universal expansion, inviting scientists to explore its mysteries and reshape our understanding of the universe.

Astronomers first became aware of the Great Attractor in the late 1970s when they observed an unexpected, massive galaxy movement toward a particular area of the sky. There were far more gravitational anomalies at work than could be accounted for by the local observable matter. This unusual gravitational pull led astronomers to search for the source of this cosmic pull, which ultimately resulted in the discovery of the Great Attractor.

“The Great Attractor” Image Credit: Tully, R. B., Courtois, H., Hoffman, Y, Pomarède

 

The Great Attractor is a gravitationally dominant object, but its precise location is obscured by a cosmic gas and dust mist. When looking through this cosmic mist, conventional optical telescopes are rendered useless. However, astronomers have turned to alternative observational techniques, such as radio telescopes and infrared imaging, to penetrate the cosmic shroud and gain insights into the nature of this mysterious gravitational focal point.

The Great Attractor is a massive mass concentration equal to tens of thousands of galaxies, not just a gravitational anomaly. Its enormous size and gravitational pull span hundreds of millions of light-years, which puts our basic notion of the universe’s size to the test. On an unprecedented scale, the very existence of such a massive structure raises questions about the formation and evolution of cosmic structures. A cosmic paradox—the universe’s unrelenting expansion against the concentrated gravitational pull of this enormous structure—lies at the core of the Great Attractor mystery. While galaxy separation is the general trend in the universe, the Great Attractor creates a gravitational dance that pulls galaxies, clusters, and even our own Milky Way toward its enigmatic core. Scientific understanding of the underlying forces forming the universe is being called into question as a result of this cosmic tug-of-war with established cosmological models.

At the heart of the Great Attractor mystery lies a cosmic paradox: the universe’s relentless expansion versus the concentrated gravitational pull of this colossal structure. While the general trend in the cosmos is the gradual separation of galaxies, the Great Attractor orchestrates a gravitational dance, drawing galaxies, clusters, and even our Milky Way toward its mysterious core. This cosmic tug-of-war challenges established cosmological models and forces scientists to reconsider our understanding of the fundamental forces shaping the universe.

Worldwide astronomers and researchers are working together to study the Great Attractor in this collaborative effort. This cosmic giant is using advanced technologies, such as powerful computational models and sophisticated telescopes, to unravel the gravitational web that it has woven. The Great Attractor may reveal more of its secrets as technology and observational capabilities develop, providing a deeper understanding of the underlying forces that shape the cosmic architecture.

Sources: 

Alderson, E. “The Powerful and Mysterious Great Attractor.” Medium, Predict, 18 Feb. 2020, medium.com/predict/the-powerful-and-mysterious-great-attractor-710f353e809f.

“The Great Attractor: Uncovering the Mystery of The Invisible Force.” Space Mesmerise, spacemesmerise.com/en-us/blogs/astronomy/the-great-attractor-uncovering-the-mystery-of-the-invisible-force. 

Siegel, Ethan. “Ask Ethan: Will the ‘great Attractor’ Defeat Dark Energy?” Forbes, Forbes Magazine, 23 July 2016, www.forbes.com/sites/startswithabang/2016/07/23/ask-ethan-will-the-great-attractor-defeat-dark-energy/?sh=67a899aa7b77.

Staveley-Smith, Lister, and University Of Western Australia. “Explainer: What Is the Great Attractor and Its Pull on the Milky Way?” Phys.Org, Phys.org, 31 May 2016, phys.org/news/2016-05-great-attractor-milky.html.

“What Is the Great Attractor, and Will It Destroy Us?” Big Think, 19 Apr. 2022, bigthink.com/surprising-science/what-is-the-great-attractor-and-will-it-destroy-us/. 

 

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  Timothy Durham was convicted of rape when a test showed his DNA genotype matched the DNA recovered from the crime scene. Eye witnesses testified that Durham was in a different state at the time of the incident, but he wasn’t exonerated from his 3000 year sentence until follow up DNA analysis showed that the preliminary forensic analysis used in the trial was misinterpreted (Thomas et al.). DNA testing serves an invaluable part in our criminal justice system, but it comes with complications and bias that can lead to wrongful convictions and misinformed juries.  

Background:

Forensic genetics aims to identify the origin of a biological sample. It can be traced back to Karl Landsteiner who discovered human ABO blood groups. With blood groups, suspects could be eliminated based on their blood type. For example, if a suspect had type A blood and there was type B blood left at the scene by the perpetrator, the investigators could rule out the suspect. Unfortunately, the reverse didn’t work. If the suspect and perpetrator both had the same blood type, it can’t be concluded that the suspect was guilty. Blood identifiers evolved into 8 distinct categories which improved the ability to eliminate suspects, but could only conclude that (if the system matched) it might be the perpetrator or this person might be related to the perpetrator (Jobling and Gill). The field evolved in the 1980s with the discovery of Minisatellites, lines of repetitive DNA that don’t encode proteins. Minisatellite patterns in DNA create what we know today as the DNA fingerprint, and it has a much higher accuracy rate than previous methods (Augustyn et al.). Around the same time, a breakthrough for victims of sexual assault was discovered. In the case of assault, bodily fluids of both the victim and the assaulter can get mixed. A process called differential lysis was created which could selectively increase the concentration of sperm in a fluid sample thereby allowing for accurate DNA testing (Jobling and Gill). Forensics evolved to use single-locus probe testing after several years because of its ease of interpretation. It looked at specific minisatellites that had high variability between subjects. This was the first DNA-based method to be used in a criminal investigation. Two murder homicides from several years apart were connected using DNA evidence. The evidence was then used to exonerate an innocent man, and the guilty party was found when he tried to evade mandatory DNA testing for all men in the small town. His guilt was then reinforced when the DNA profiles matched, and he gave a confession (Jobling and Gill). Finding DNA at a crime scene doesn’t guarantee that you’ll find a murderer. There are issues with non-pure samples and limited samples that make DNA work difficult, and accreditation of facilities and new techniques and take time (Jobling and Gill).  

Subjectivity of DNA Interpretation:

In a 2009 publication, the National Academy of Science discusses the possibility for subjective influence in lab based forensics. The interpretation bias happens in complex cases where, for example, there could be a mixture of DNA. A study published in 2011 looked specifically at this issue. A gang rape happened in Georgia, and the mixture in DNA from the case was used to prosecute one suspect after another suspect took a plea bargain to testify against him. With DNA mixtures, there are three possible conclusions: suspect excluded, suspect cannot be excluded, and inconclusive. If the suspect is excluded, it means that there’s little to no possibility that his DNA is part of the sample. If the suspect cannot be excluded, it means that there’s a possibility that his DNA is part of the sample. In the trial, the DNA examiners who knew the context of the case concluded that the suspect being prosecuted could not be excluded. The 2011 study gave the DNA evidence from this case and the DNA profiles of the suspects to 17 forensic examiners. These examiners had no context of the case, and they all worked independently. Of the 17, only 1 came to the same conclusion (suspect cannot be excluded) as the examiners who knew the context of the case. Twelve of the 17 concluded that the suspect who was prosecuted and convicted had no relation to the DNA found in the sample. Not only does this show that subjectivity occurs due to the context of the case, but the 17 examiners came up with different findings based on their past experiences meaning that not all DNA analysis is objective. Some organizations like the Scientific Working Group on DNA Analysis Methods say that quantitative statistical evidence should be presented with every categorical conclusion, but the US doesn’t require this (Dror and Hampikian).

False Positives:

There are two categories that cause wrongful identification in a DNA report: coincidental matches and false positives. Coincidental matches are DNA matches between two unrelated people. The probability of these matches is about 1 to 500,000 for white individuals and about 1 to 350,000 for black individuals. This small probability of coincidental matches makes people feel confident in DNA evidence. False positives, on the other hand, are matches between DNA and test DNA that result from issues in the forensics lab. There have been multiple cases of forensics labs accidentally switching victim and suspected rapist DNA which lead to convictions that were later overturned when the lab realized the error. There are also cases of misreading or misunderstanding a sample. In a case from 1993, a man was convicted of rape because someone interpreted a mixed sample of victim and perpetrator DNA as an individual sample. The conviction was again overturned. To prevent false convictions, retesting DNA is allowed, but it’s not an efficient solution. Many people are pushing for statistical information on the probability of false positives, so that the jurors can make accurate judgements based on DNA evidence (Thomas et al.).  

Conclusion:

DNA analysis is a useful tool for the criminal justice system, but subjectivity can be an issue in forensic testing. To combat wrongful convictions, there are organizations like The Innocence Project who use DNA testing to free the innocent, but reformed forensic testing standards should be put in place to prevent subjectivity and to ensure juries are correctly informed during trials. https://www.innocenceproject.org/    

Citation:

Augustyn , Adam, et al. “DNA Finerprinting.” Encyclopedia Britannica , 26 Apr. 2018, www.britannica.com/science/DNA-fingerprinting#ref153186. Dror, Itiel E., and Greg Hampikian. “Subjectivity and Bias in Forensic DNA Mixture Interpretation.” Science & Justice, vol. 51, no. 4, 2011, pp. 204–208., doi:10.1016/j.scijus.2011.08.004. Jobling, Mark A., and Peter Gill. “Encoded Evidence: DNA in Forensic Analysis.” Nature Reviews: Genetics, vol. 5, no. 10, Oct. 2004, pp. 739–751., doi:10.1038/nrg1455. Thompson, William C, et al. “How the Probability of a False Positive Affects the Value of DNA Evidence.” Journal of Forensic Sciences, vol. 48, no. 1, Jan. 2003, pp. 1–8., doi:10.1520/jfs2001171.