Archive for the ‘existential risks’ category: Page 8

Dec 9, 2020

Accessing the arches of chaos in the solar system for fast transport

Posted by in categories: asteroid/comet impacts, existential risks

Space manifolds form the boundaries of dynamic channels to provide fast transport to the innermost and outermost reaches of the solar system. Such features are an important element in spacecraft navigation and mission design, providing a window to the apparently erratic nature of comets and their trajectories. In a new report now published on Science Advances, Nataša Todorović and a team of researchers in Serbia and the U.S. revealed a notable and unexpected ornamental structure of manifolds in the solar system. This architecture was connected in a series of arches spreading from the asteroid belt to Uranus and beyond. The strongest manifolds were found linked to Jupiter with profound control on small bodies across a wide and previously unknown range of three-body energies. The orbits of these manifolds encountered Jupiter on rapid time-scales to transform into collisional or escaping trajectories to reach Neptune’s distance merely within a decade. In this way, much like a celestial highway, all planets generate similar manifolds across the solar system for fast transport throughout.

Navigating chaos in the solar system

In this work, Todorović et al. used fast Lyapunov indicator (FLI); a dynamic quantity used to detect chaos, to detect the presence and global structure of space manifolds. They captured the instabilities acting on orbital time scales with the sensitive and well-established numerical tool to define regions of fast transport in the solar system. Chaos in the solar system is inextricably linked to the stability or instability of manifolds forming intricate structures whose mutual interaction can enable chaotic transport. The general properties can be described relative to the planar, circular and restricted three-body problem (PCR3BP) approximating the motion of natural and artificial celestial bodies. While this concept is far from being fully understood, modern geometric insights have revolutionized spacecraft design trajectories and helped build new space-based astronomical observatories to transform our understanding of the cosmos.

Nov 26, 2020

AI trained on the bible spits out bleak religious prophecies

Posted by in categories: existential risks, information science, robotics/AI

Code Unto Caesar

Durendal’s algorithm wrote scripture about three topics: “the plague,” “Caesar,” and “the end of days.” So it’s not surprising that things took a grim turn. The full text is full of glitches characteristic of AI-written texts, like excerpts where over half of the nouns are “Lord.” But some passages are more coherent and read like bizarre doomsday prophecies.

For example, from the plague section: “O LORD of hosts, the God of Israel; When they saw the angel of the Lord above all the brethren which were in the wilderness, and the soldiers of the prophets shall be ashamed of men.”

Nov 23, 2020

How Werner Herzog learned to love Star Wars

Posted by in categories: asteroid/comet impacts, existential risks

“Herzog tells Inverse he’s less concerned than ever that a meteorite will destroy the Earth, but that doesn’t mean we shouldn’t still be worried about our own extinction. “It may be 100 million years to go until then,” Herzog says, before adding, “within the next thousand years, we may have done such stupid things that we are not around anymore to contemplate it.” The German filmmaker also explains what asteroids reveal about the universe, why he’s never watched Rick and Morty, even though it’s a “fiendishly intelligent show,” and lists the many things that could wipe out humanity before a meteorite ever arrives.”

The legendary director discusses his new film, ‘Fireball: Visitors From Darker Worlds,’ along with Star Wars, ‘Rick and Morty,’ and working with a co-director.

Nov 15, 2020

Does all the gold in the universe come from stars?

Posted by in categories: energy, existential risks, physics

In a remote galaxy, two neutron stars circled one another in a ballet of ultimate destruction and inevitable creation. Both objects were the remnants of massive stars, probably from a binary system, that had become supernovae long before. Each was incredibly massive, with neutrons so closely packed that their cores became diamond. The dance, alas, could not go on forever and the stars collided, releasing unimaginable energy and sending gravitational waves speeding through the fabric of space-time.

In 2017, 1.3 billion years later, astronomers detected those waves with the Laser Interferometer Gravitational-wave Observatory. Albert Einstein’s prediction that the universe should be filled with such faint ripples caused by gravity from massive objects included sources such as neutron star mergers. Yet finding a disturbance in the fabric of space-time from this kind of event had proven elusive until then. When news of the detection of gravitational waves broke, the media wanted to know what else happens when neutron stars collide. Astronomers explained that, beyond the destruction of the stars and the ripples in space, such events also create all the heavy elements we know in the blink of an eye. But what did the media key into? That gold comes from outer space.

Nov 10, 2020

Kosta Tsipis, MIT physicist and prominent voice for nuclear disarmament, dies at 86

Posted by in categories: existential risks, military, nuclear weapons, physics, treaties

In arguing against nuclear war, Dr. Tsipis said he came « to believe that reason must prevail. »

A curious boy who gazed at the stars from his mountainside Greek village and wondered how the universe came to be, Kosta Tsipis was only 11 when news arrived that the first atomic weapon had been dropped on Hiroshima, Japan.

“After the bomb went off, I sent away for a book because I wanted to understand it,” he told the Globe in 1987.

Continue reading “Kosta Tsipis, MIT physicist and prominent voice for nuclear disarmament, dies at 86” »

Nov 9, 2020

The Craters on Earth: New Atlas Presents and Explains the Impact Sites of Meteorites and Asteroids Worldwide

Posted by in categories: asteroid/comet impacts, existential risks, mapping, satellites

Prof. Dr. Thomas Kenkmann, geologist from the University of Freiburg’s Institute of Earth and Environmental Sciences, together with mineralogist Prof. Dr. Wolf Uwe Reimold from the University of Brasilia, Brazil, and Dr. Manfred Gottwald from the German Aerospace Center (DLR) published an atlas providing a comprehensive overview of all known impact craters on every continent. The authors present the more than 200 terrestrial impact sites in high-resolution topographic maps and satellite images, complete with detailed geological descriptions and photographs of the crater structures and their rocks. They also explain the essential details of each impact event.

The formation of craters by asteroid and comet impact has always been a fundamental process in the solar system, explains Kenkmann. As the planets developed along with their moons, these impacts played an important part in accreting planetary mass, shaping the surfaces of planetary bodies, and later also influencing their development. And larger meteorite impacts eventually affected the development of life on Earth.

Today, mapping of what can still be seen of the impact structures on the Earth’s surface can be done by satellites in low Earth orbit. From 2010 to 2016, the DLR successfully measured the Earth’s surface with the radar satellites of the TanDEM-X mission. The acquired data allowed, for the first time, to derive a worldwide terrain model with a height accuracy of up to one meter. From this global digital elevation model the authors have been able to produce this complete topographic atlas of 600 pages with information about all terrestrial impact craters known to date.

Continue reading “The Craters on Earth: New Atlas Presents and Explains the Impact Sites of Meteorites and Asteroids Worldwide” »

Nov 4, 2020

Infamous asteroid Apophis is accelerating

Posted by in categories: asteroid/comet impacts, existential risks

Astronomers at the University of Hawaii issued a statement on October 26, 2020, revealing critical new findings linked to the large near-Earth asteroid 99942 Apophis, which is expected to pass close to Earth in 2029, 2036 and again in 2068. Dave Tholen and collaborators announced they have now detected a Yarkovsky acceleration on asteroid Apophis, arising from a minuscule push imparted by sunlight. This force is particularly important for asteroid Apophis, the scientists in Hawaii said, because it relates to the possibility of an Earth impact in 2068.

The 2021 lunar calendars are here! Order yours before they’re gone. Makes a great gift!

Tholen and colleagues used the 323-inch (8.2-meter) Subaru Telescope at Mauna Kea, Hawaii, to make the new observations. Their work suggests that the huge space rock – whose estimated diameter is between 1,115 and 1,214 feet (340 to 370 meters) – is drifting more than 500 feet (about 170 meters) per year from its expected position in its orbit.

Oct 28, 2020

Ex-US cyber command chief: Enemies using AI is ‘existential threat’

Posted by in categories: cybercrime/malcode, existential risks, robotics/AI

Certain cyber-artificial intelligence attacks could pose an existential threat to the US and the West, former US cyber command chief, Maj.-Gen. (ret.) Brett Williams said on Tuesday.

Speaking as part of Cybertech’s virtual conference, Williams said, “artificial intelligence is the real thing. It is already in use by attackers. When they learn how to do deepfakes, I would argue this is potentially an existential threat.”

Oct 28, 2020

“2068” –Massive Asteroid Apophis on Path for Earth Impact

Posted by in categories: asteroid/comet impacts, existential risks

Laser it o.o

Sixty Six million years ago a 14-kilometer long, Mount-Everest sized asteroid blasted a hole in the ground, when at the moment of impact, “the top of it might have still towered more than a mile above the cruising altitude of a 747,” writes Peter Brannen in Ends of the World. “In its nearly instantaneous descent, it compressed the air below it so violently that it briefly became several times hotter than the surface of the sun, hitting Earth with enough force enough to lift a mountain back into space at escape velocity, releasing the equivalent of 100 million megatons of TNT creating a 20-mile deep, 110-mile hole and sterilizing the remaining 170 million square miles of the ancient continent of Pangaea, killing virtually every species on Earth and, oddly, paving the way for the emergence of the human species.”

Magnified Preview of a Coming Attraction?

Continue reading “‘2068’ --Massive Asteroid Apophis on Path for Earth Impact” »

Oct 25, 2020

The lynx effect: Iberian cat claws its way back from brink of extinction

Posted by in category: existential risks

A 20-year project to reintroduce the species across the peninsula has seen their numbers rise to 855.

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