How Far Human Civilisation is Detectable in Space
Earth’s most detectable techno-signatures are the planetary radar transmissions from the erstwhile Arecibo Observatory............
#Arecibomessage #AreciboObservatory #ETI #ExtraTerrestrial #Extraterrestrialintelligence #SETI
Umesh Prasad
How Far Human Civilisation is Detectable in Space
Earth’s most detectable techno-signatures are the planetary radar transmissions from the erstwhile Arecibo Observatory............
#Arecibomessage #AreciboObservatory #ETI #ExtraTerrestrial #Extraterrestrialintelligence #SETI
Umesh Prasad
How Far Human Civilisation is Detectable in Space
Earth’s most detectable techno-signatures are the planetary radar transmissions from the erstwhile Arecibo Observatory............
#Arecibomessage #AreciboObservatory #ETI #ExtraTerrestrial #Extraterrestrialintelligence #SETI
Umesh Prasad
Today in the Planetary Science Journal:
Stickle et al. 2024, "Tour of Asteroids for Characterization Observations (TACO): A Planetary Defense Asteroid Tour Concept" - https://iopscience.iop.org/article/10.3847/PSJ/ad7a6c
@schmemela , @asrivkin , and company present a new concept for a flyby mission that visits numerous near Earth asteroids.
Including #1998OR2 , which was one of the last asteroids imaged by #TeamRadar with the #AreciboObservatory in 2020.
This failure analysis of the #AreciboObservatory collapse is fascinating. https://nap.nationalacademies.org/catalog/26982/failure-analysis-of-the-arecibo-observatory-305-meter-telescope-collapse
One of the conclusions is that the never-seen-in-100-years failure of the zinc cable anchor plugs may have been caused by fatigue due to induced currents from the radio transmitters used for the dish...!
The National Academies report outlines a potential cause for the additional creep of the zinc at the #AreciboObservatory :
Induction during #TeamRadar transmissions producing current in the cables; which was conducted through the anchors and the towers to the ground, heating up the zinc just slightly in the process.
By itself, this would have been manageable. In combination with the damage from Hurricane Maria and other effects, it was eventually not.
via @profabelmendez :
The National Academies has released its report on the loss of the #AreciboObservatory .
"Failure Analysis of the Arecibo Observatory 305-Meter Telescope Collapse" - https://nap.nationalacademies.org/catalog/26982/failure-analysis-of-the-arecibo-observatory-305-meter-telescope-collapse
Confirming the NASA analysis of the anchors holding the cables failing due to unexpected creep of zinc: https://ntrs.nasa.gov/citations/20210017934
As well as outlining damage directly caused by #HurricaneMaria in 2017.
Today in the Planetary Science Journal:
@PlanetTreky et al. 2024, "Radar Circular Polarization Ratio of Near-Earth Asteroids: Links to Spectral Taxonomy and Surface Processes" - https://iopscience.iop.org/article/10.3847/PSJ/ad7df1
Here Ed Rivera-Valentín presents their update to Benner et al. 2008; using the full #TeamRadar near-Earth asteroid sample from the #AreciboObservatory to better understand relationships between asteroid compositions and radar scattering properties.
The 47-year-old mystery of the "Wow! Signal" might finally be solved! Scientists from the Arecibo Observatory suggest it was caused by a rare astrophysical event, such as the brightening of a cold hydrogen cloud due to a magnetar flare. This groundbreaking discovery redefines our understanding of such signals and could guide future searches for extraterrestrial life.
#WowSignal #SpaceDiscovery #AreciboObservatory #Astrophysics #SETI #GoodNews
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Umesh Prasad
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