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Meta & Fysikken

Meta & Fysikken

De : Dr. Karina Kjær & Anders Jensen
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 Vi taler om universet, tiden, jordkloden, mennesket og meget mere. Ingen akademisk baggrund nødvendig. Vi bringer det hele ned i øjenhøjde!Anders Jensen & Karina Kjær Nature et écologie Philosophie Science Sciences sociales
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    • Meta & Fysikken: Afsnit 117: Jordens magnetfelter, verdenssituationen mv

      Meta & Fysikken: Afsnit 117: Jordens magnetfelter, verdenssituationen mv
      Jan 30 2026
      1) Jordens Magnetfelt2) Mennesker påvirker Jordens massefordeling og dermed magnetfeltet3) Plastik4) Temperaturen for 2025 er kommet ind5) Astronauts return early (a non story?)6) JWST black hole ripping through space:7) Solformørkelse i Spanien------------------------------1:Magnetisk Nord pol vandrer:https://www.sciencealert.com/earths-magnetic-north-pole-is-officially-moving-scientists-just-updated-its-locationEarth's Magnetic North Pole Is Officially Moving – Scientists Just Updated Its Location : ScienceAlertJordens magnetfelt har en Anomali:https://www.sciencealert.com/vast-anomaly-in-earths-magnetic-field-keeps-growing-satellites-revealVast Anomaly in Earth's Magnetic Field Keeps Growing, Satellites Reveal : ScienceAlert-------------2)Humanity Has Dammed So Much Water It's Shifted Earth's Magnetic Poles : ScienceAlerthttps://www.sciencealert.com/humanity-has-dammed-so-much-water-its-shifted-earths-magnetic-polesAs we trap water behind dams, not only does it remove water from the oceans, thus leading to a global sea level fall, it also distributes mass in a different way around the world.Extra weight added to a spinning sphere pulls the weighted part towards the equator, shifting the axis around which the sphere spins. So, redistributing Earth's surface weight re-orientates its spin axis, whether that be through damming water, melting glaciers, or groundwater removal.But it's only Earth's outer crust floating over its gooey inner parts – not the inner goo generating the magnetic field – that shift, leading to a different part of Earth's surface sitting over our planet's inner magnetic north.So, while north itself hasn't really moved in space, Earth's surface has shifted around, over the top of it. This phenomenon is called true polar wander.https://www.sciencealert.com/earths-flipping-magnetic-field-heard-as-a-sound-is-an-unnerving-horror———PlastikThe primary source of plastic isfossil fuels, specifically crude oil and natural gas. Over 99% of plastic is produced from these non-renewable hydrocarbon sources, which are refined into monomers like ethylene and propylene, and then polymerized into plastic materials3) Jagten på det nye plastikhttps://interestingengineering.com/science/biodegradable-plastic-made-from-bambooPlastik fra Avokado sten:https://worldbiomarketinsights.com/biofase-develops-biopolymers-from-avocado-pits/———-4) In 2025, the global average surface temperature was approximately 1.44∘C-1.47∘Cabove the pre-industrial (1850–1900) level. It was confirmed as the third-warmest year on record, trailing behind 2024 and 2023 despite the cooling influence of a La Niña pattern. —————-5) Astronauts return earlyhttps://www.sciencealert.com/nasa-brings-astronauts-home-early-after-unprecedented-medical-issue-in-space?———————6) JWST black hole ripping through space:https://www.sciencealert.com/jwst-confirms-first-runaway-supermassive-black-hole-tearing-through-space——————7) Solformørkelse i Spanien. Man kan komme på rejse med Michael Linden Vørnlehttps://smilrejser.dk/spanien/solformoerkelse-i-spanien-med-astrofysiker-michael-linden-voernle
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      1 h
    • Meta & Fysikken: Afsnit 116: COP 30, klimanyt og mos

      Meta & Fysikken: Afsnit 116: COP 30, klimanyt og mos
      Dec 29 2025
      —————-2: Tysklands største Hydrogen fabrik:Germany's largest commercial renewable hydrogen factory is the 10 MW plant in Schwäbisch Gmünd, opened by Lhyfe in October 2025. The facility can produce up to 4 tons of renewable hydrogen per day and is Lhyfe's largest outside of France.While it's the largest operational commercial plant, there are larger-scale projects planned for the future in Germany, such as a 130 MW plant planned for Prenzlau by ENERTRAG.https://engineerine.com/largest-green-hydrogen-plant/https://www.lhyfe.com/press/lhyfe-inaugurates-germanys-largest-commercial-renewable-hydrogen-production-site-in-baden-wurttemberg-to-distribute-rfnbo-certified-hydrogen-to-a-range-of-players/A green hydrogen factory is good for the climate because it can be produced using renewable energy, with zero greenhouse gas emissions, and can replace fossil fuels in sectors that are hard to electrify, like heavy industry. When used in a fuel cell, hydrogen only releases water vapor and warm air, making it a clean energy carrier that can also store and deliver renewable energy.#Hydrogen Fuel Cell makes electricity directly. They also produce water vapor, heat and, depending on the fuel source, very small amounts of nitrogen dioxide and other emissions.————-3: Skrumpende havishttps://nyheder.tv2.dk/klima/2025-10-21-skrumpende-havis-er-katastrofe-men-kan-have-fordel-------------------------4: Kelp farming in Norwayhttps://www.dnv.com/news/2024/new-seaweed-farm-off-the-norwegian-coast-seeks-to-remove-co2-from-the-atmosphere-252006/————5: Canada og mos:https://greencitysolutions.de/en/increasing-biodiversity-for-cities-with-moss/#:~:text=Increasing%20Biodiversity%20with%20Moss%20in,or%20fully%20greened%20on%20request———6: Energi fra Vulkaner:https://www.sciencealert.com/scientists-unveil-radical-plan-to-drill-into-a-volcano-for-near-unlimited-energyIøvrigt:7: Vulkanudbrud i Afrikahttps://www.scientificamerican.com/article/hayli-gubbi-volcano-erupts-in-ethiopia-for-first-time-in-more-than-12-000/Volcanic activity has both short-term cooling and long-term warming effects. Volcanic eruptions can release gases like sulfur dioxide (\(SO_\)), which create aerosols that reflect sunlight and cause temporary global cooling, as seen after the Mount Pinatubo eruption. However, volcanoes also release carbon dioxide (\(CO_\)), a greenhouse gas that contributes to warming, though the amount from volcanoes is significantly less than human-generated \(CO_\). Short-term cooling effects Sulfuric acid aerosols: Eruptions inject sulfur dioxide into the stratosphere, where it reacts with water to form tiny sulfuric acid droplets.Reflection of sunlight: These aerosols act like a global "umbrella," reflecting incoming solar radiation back into space and causing a temporary cooling effect that can last for several years.Examples: The 1991 Pinatubo eruption caused a global cooling of about \(0.5^ C\) for a year, and the 1815 Tambora eruption led to "the year without a summer" in 1816. Long-term warming effects Carbon dioxide (\(CO_\)): Volcanoes release \(CO_\), a greenhouse gas that traps heat in the atmosphere, contributing to global warming.Minor contribution: The \(CO_\) emitted by volcanoes is a very small fraction of the total greenhouse gases in the atmosphere, with human activities being the dominant source. For example, the \(CO_\) from the Pinatubo eruption was only about half of what humans produce in two days
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      1 h et 12 min
    • Meta & Fysikken: Afsnit 115: Hvad sker der i rummet for tiden?

      Meta & Fysikken: Afsnit 115: Hvad sker der i rummet for tiden?
      Dec 12 2025
      Vi tager endnu en runde med universelt stof! Hvad sker der i rummet lige for tiden?1: 3I/Atlas2: Sten fra Mars3: Temporary Moon4: Sattelite made out of wood5: Starship 6: Store tal7: Enhederne meter og sekund-----------------------------------1: 3I/AtlasNASA deler første fotos af 3I/ATLAS: Ikke rumvæsenerhttps://videnskab.dk/rummet/nasa-deler-foerste-fotos-af-3i-atlas-ikke-rumvaesener/NASA press release 19.11.25:ESA:https://www.esa.int/ESA_Multimedia/Images/2025/12/Comet_3I_ATLAS_shows_activity_in_Juice_navigation_camera_teaserESA - Comet 3I/ATLAS shows activity in Juice navigation camera teaserDuring November 2025, ESA’s Jupiter Icy Moons Explorer (Juice) used five of its science instruments to observe 3I/ATLAS. The instruments collected information about how the comet is behaving and what it is made of.In addition, Juice snapped the comet with its onboard Navigation Camera (NavCam), designed not as a high-resolution science camera, but to help Juice navigate Jupiter’s icy moons following arrival in 2031.Though the data from the science instruments won’t arrive on Earth until February 2026, our Juice team couldn’t wait that long. They decided to try downloading just a quarter of a single NavCam image to see what was in store for them. The very clearly visible comet, surrounded by signs of activity, surprised them.Not only do we clearly see the glowing halo of gas surrounding the comet known as its coma, we also see a hint of two tails. The comet’s ‘plasma tail’ – made up of electrically charged gas, stretches out towards the top of the frame. We may also be able to see a fainter ‘dust tail’ – made up of tiny solid particles – stretching to the lower left of the frame.The image was taken on 2 November 2025, during Juice’s first slot for observing 3I/ATLAS. It was two days before Juice’s closest approach to the comet, which occurred on 4 November at a distance of about 66 million km.We expect to receive the data from the five scientific instruments switched on during the observations – JANUS, MAJIS, UVS, SWI and PEP – on 18 and 20 February 2026. The delay is because Juice is currently using its main high-gain antenna as a heat shield to protect it from the Sun, leaving its smaller medium-gain antenna to send data back to Earth at a much lower rate.Though Juice was further from 3I/ATLAS than our Mars orbiters were back in October, it observed 3I/ATLAS just after the comet’s closest approach to the Sun, meaning that it was in a more active state. We expect to see clearer signs of this activity in the data from the science instruments. This includes not only images from JANUS – Juice’s high-resolution optical camera – but also spectrometry data from MAJIS and UVS, composition data from SWI, and particle data from PEP.ESA - ESA’s ExoMars and Mars Express observe comet 3I/ATLASWe have an update on 3I/ATLAS! Until September, figuring out the location and trajectory of 3I/ATLAS relied on Earth-based telescopes. Then between 1 and 7 October, our ExoMars TGO turned its eyes towards the interstellar comet from its orbit around Mars. The comet passed relatively close to Mars, approaching to about 29 million km during its closest phase on 3 October.The Mars probe observed the comet from a new viewing angle. The triangulation of its data with data from Earth helped to make the comet’s predicted path much more accurate. The result was an impressive ten-fold leap in accuracy, reducing the uncertainty of the object’s location.Because 3I/ATLAS is passing through our Solar System fast, travelling with speeds up to 250 000 km/h, it will soon vanish into interstellar space, never to return.The comet is currently being observed with our Juice spacecraft. Though Juice is farther from 3I/ATLAS than the Mars orbiters were last month, it is seeing the comet just after its closest approach to the Sun, when it is in a more active state. We don’t expect to receive data from Juice’s observations until February 2026. Komet Kalender:--------------2: Sten fra Mars:https://www.sciencealert.com/curiosity-cracked-open-a-rock-on-mars-and-revealed-a-big-surpriseCuriosity Cracked Open a Rock on Mars And Revealed a Big Surprise : ScienceAlerthttps://phys.org/news/2025-12-evidence-driven-climate-mars-jezero.htmlEvidence of rain-driven climate on Mars found in bleached rocks scattered in Jezero crater--------------------------3: Temporary MoonEarth currently has a temporary moon, an asteroid designated 2025 PN7, that is in a quasi-satellite orbit. It is not permanently bound to Earth like the main Moon, but rather shares Earth's orbit around the Sun, occasionally entering our planet's gravitational influence for several decades before drifting away again. Earth has had other temporary "mini-moons" in the past, and this is not expected to be the last. About 2025 PN7 : Size: The asteroid is between 18 to 36 meters wide, or about the size of a building. Orbit: It orbits the Sun ...
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      1 h et 12 min
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