Showing all posts about science
The Taupo Volcano and supervolcanoes a Kurzgesagt dissection
20 October 2022
Last month the alert level for the volcano below Lake Taupō in New Zealand’s North Island was raised from zero to one. A swarm of relatively small earthquakes this year prompted geologists to make the adjustment. But as scientists monitoring the recent seismic activity noted, the change in alert status is more down to improved surveillance techniques. In other words it seems such activity is relatively normal, but has simply gone undetected previously.
Let’s hope there’s nothing to be concerned about, as supervolcanoes are truly a force of nature. An eruption at Taupō over twenty-six thousand years ago was the largest known volcanic eruption in the world in the past seventy-thousand years. With a rating of eight on the Volcanic Explosivity Index, the blast caused temperatures across the entire southern hemisphere to plummet. If such an eruption were repeated today, we’d all notice the fallout no matter where on Earth we were.
It’s timely then Kurzgesagt’s latest video examines so-called supervolcanoes, and puts our minds at ease in terms of the likelihood of such an eruption anytime in the near-ish future.
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How can nothing unreal exist in a not locally real universe?
10 October 2022
In addition to Annie Ernaux being named the Nobel Prize literature laureate , John Clauser, Alain Aspect, and Anton Zeilinger, received the Nobel for their contributions to physics this year. I studied physics in high-school for an ill-fated year, and struggled to make sense of any of it. Way too mathematical. And maybe way too weird.
All the more so, given the Nobel award winning work of Clauser, Aspect, and Zeilinger, effectively “overthrows reality as we know it.” This outcome spans the previous study of a whose-who of household names in the realm of physics, including John Stewart Bell, Boris Podolsky, Nathan Rosen, John von Neumann, and of course, Albert Einstein.
Quantum mechanics’ problem of nonlocal realism would languish in a complacent stupor for another three decades until being decisively shattered by Bell. From the start of his career, Bell was bothered by the quantum orthodoxy and sympathetic toward hidden variable theories. Inspiration struck him in 1952, when he learned of a viable nonlocal hidden-variable interpretation of quantum mechanics devised by fellow physicist David Bohm — something von Neumann had claimed was impossible. Bell mulled the ideas over for years, as a side project to his main job working as a particle physicist at CERN.
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Kurzgesagt explores the realm of the minute and subatomic
8 October 2022
Kurzgesagt ventures to the most extreme place in the universe… a whole ‘nother universe, or microcosm: the realm of the minute and subatomic.
The universe is pretty big and very strange. Hundreds of billions of galaxies with sextillions of stars and planets and in the middle of it all there is earth, with you and us. But as enormous as the universe seems looking up, it seems to get even larger when you start looking down. You are towering over worlds within worlds, within worlds — each in plain sight and yet hidden from your experience.
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DART helping to protect Earth from off planet threats
29 September 2022
It could be argued we’re not doing as much as we could to avert potential catastrophes on the planet. Climate change and global conflict would be two examples. When it comes countering possible threats from outside though, some progress is being made.
The test of an asteroid defence system, whereby a NASA probe was sent to collide with Dimorphos, a celestial object, to effect a change, albeit minor, in its trajectory, is one instance.
NASA did not send this probe to observe this asteroid or even scoop some samples from its surface to bring back to Earth, as other missions have done. The agency dispatched the spacecraft with the explicit hope of crashing it and changing the asteroid’s trajectory. This is a test run, but a future version of this mission could save Earth from a catastrophic impact by deflecting an asteroid on a collision course. A little bit of practice never hurts.
While Dimorphos does not pose a threat to Earth — at least not at the moment — another asteroid such as the one that brought about the demise of the dinosaurs, might in the future.
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Sydney to host the 2025 International Astronautical Congress
26 September 2022
With a number of planets, particularly Jupiter, dominating the eastern night sky of Australia at the moment, what better time to make mention that the 2025 International Astronautical Congress (IAC) will be held in the NSW capital, Sydney.
Founded in 1951, the International Astronautical Federation (IAF) is the world’s leading space advocacy body with around 460 members in 72 countries, including all leading space agencies, companies, research institutions, universities, societies, associations, institutes and museums worldwide. The Federation advances knowledge about space, supporting the development and application of space assets by promoting global cooperation.
The last time Australia hosted an IAC event was in 2017, when the International Astronautical Federation conference took place in Adelaide, South Australia.
On the subject of astronomical matters, check out If the Moon were only one pixel, by American interactive art director and designer Josh Worth. Now we can see why they call it space…
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astronomy, events, science, Sydney
UFO sightings surge in skies above Ukraine recently
16 September 2022
Astronomers in Ukraine have observed an uptick in unidentified flying objects over the country in recent months. While it seem obvious there would be more aerial activity with a war raging in the region, scientists are adamant what they’re seeing in Ukrainian skies are not military vessels.
Ukraine astronomers have reported a slew of UFOs observed in the country’s airspace. They’ve reported their findings in a preprint paper published by Kyiv’s Main Astronomical Observatory Ukraine’s National Academy of Science. Remember, UFOs don’t necessarily mean extraterrestrial spaceships from other planets. Perhaps they are advanced military aircraft from much closer to home, like even from one of Ukraine’s (ahem) neighbors.
All the more curious given recent reports from US Navy pilots who say they’ve seen unidentified flying objects during flight operations. Are unidentified flying objects drawn to areas where military craft are operating?
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Apollo Remastered, beautifully enhanced photos of the Apollo flights
5 September 2022
Image courtesy of NASA.
The above image is of Aquarius, lunar module of the ill-fated Apollo 13 Moon flight of April 1970.
Here it is seen moments after being jettisoned by the Apollo crew. For those who came in late, Aquarius acted as a “lifeboat” for much of the shortened Apollo 13 mission, after an explosion damaged Odyssey, the command module. Without Aquarius the crew may never have returned home.
I’m not sure though if it features in Apollo Remastered, the new book by British author and science writer Andy Saunders, which contains a veritable trove of photos from the Apollo missions. Saunders has spent the last few years enhancing four hundred previously grainy images, making them far sharper and clearer than those originally released.
Some before and after examples of the remastered photos can be seen in this BBC report by Jonathan Amos. And if you’re not familiar with the Apollo 13 story, American filmmaker Ron Howard’s 1995 feature of the same name is well worth a look.
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books, history, photography, science
Video of a solar eclipse on Mars, Phobos occults the Sun
30 August 2022
Footage of a solar eclipse on Mars, filmed by NASA roving probe Curiosity. Eclipses on Mars are a little different to those we are treated to on Earth though, with the speed of the red planet’s “moontatoes” making the phenomenon more of a blink and you’ll miss it occasion.
Mars’ moons Phobos (“fear” in Ancient Greek) and Deimos (“dread”) circle Mars every 7.65 and 30.35 hours respectively, a relative blink compared to the 27-day orbit of Earth’s moon. They’re also a lot smaller than the Moon, and considerably more lumpy – little moontatoes, rather than the nice round disk we see shining so argently in our night sky.
It makes me think. If Pluto doesn’t make the grade as a “proper” planet, why should the so-called satellites of Mars be regarded as moons? Surely “captured objects” would be a more apt classification.
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astronomy, Mars, science, video
The sound of the Perseus galaxy cluster black hole
25 August 2022
NASA have again been applying sound, or musical notes, to the data they’ve collected from objects in the universe — a process called sonification — this time a black hole located about two-hundred-and-forty million light years away in the Perseus galaxy cluster.
People have variously likened the droning sound produced by the black hole to wailing ghosts or grumbling, hungry, stomachs. Somehow I think of water draining down a plughole.
The Perseus galaxy cluster is intriguing of itself being, according to Wikipedia, one of the most massive objects in the known universe, containing thousands of galaxies immersed in a vast cloud of multimillion-degree gas. I doubt we’ll be sending our star ships too close to that cluster…
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5000 exoplanets pinpointed and given a sound signature
23 August 2022
Prior to 1992 exoplanets — being planets orbiting stars other than the Sun — were unheard of. While scientists believed they existed, thirty years ago none had been found. Today though exoplanets are the rule rather than the exception with over five thousand such bodies having been identified so far.
And with an estimated one-hundred-thousand-million stars in our galaxy, the Milky Way, it is likely many, many, more exoplanets will come to light. This nifty animation and sonification produced by NASA pinpoints the location of stars hosting exoplanets, while a pitch or chime conveys other information about the planet.
This animation and sonification tracks humanity’s discovery of the planets beyond our solar system over time. Turning NASA data into sounds allows users to hear the pace of discovery, with additional information conveyed by the notes themselves. As each exoplanet is discovered, a circle appears at its position in the sky. The size of the circle indicates the relative size of the planet’s orbit and the color indicates which planet detection method was used to discover it. The music is created by playing a note for each newly discovered world. The pitch of the note indicates the relative orbital period of the planet. Planets that take a longer time to orbit their stars are heard as lower notes, while planets that orbit more quickly are heard as higher notes.
The question now is how many exoplanets are capable of supporting life (as we know it), and is life present on any of these bodies.
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