https://www.jriordon.com/relatively-easy-blog daily 0.75 2026-01-15 https://www.jriordon.com/relatively-easy-blog/dropped-clock-relativity-puzzle monthly 0.5 2026-01-15 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/21fd0194-5627-4dda-8e22-de184a21c2af/_675663b0-8ccb-44d6-ba1a-c9122e989909.jpg Relatively Easy Blog - Dropped Clock Relativity Puzzle - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.jriordon.com/relatively-easy-blog/a-taste-of-crush monthly 0.5 2025-12-10 https://www.jriordon.com/relatively-easy-blog/snakes-natures-gravity-experiment monthly 0.5 2025-12-09 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/9de8f72d-bc07-4598-936f-841646a1481d/Screenshot+2025-12-08+at+8.15.47%E2%80%AFAM.png Relatively Easy Blog - Snakes: Nature’s Gravity Experiment - Make it stand out A sea snake (left) has a heart located roughly midway along its body. A tree snake (right) needs its heart to be close to its head to ensure it gets enough oxygen to its brain so it won’t faint as it climbs. A ground snake (middle) splits the difference, with its heart farther forward than a sea snake, but not as far forward as a tree snake. Researchers propose that the various arrangements are due to the effect of gravity on snake evolution. ~ illustration by Mary May Heil https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/5a28e343-f139-4d1a-aeb1-1bf7761b6585/Laticauda_colubrina_%28Wakatobi%29.jpg Relatively Easy Blog - Snakes: Nature’s Gravity Experiment - Make it stand out A highly venemous yellow lipped krait enjoys perpetual freefall as an ocean dwelling sea snake. Credit: Craig D https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/b0f48fb7-627a-4bc9-aae8-25d21727163c/PXL_20241025_215547228+%281%29.jpg Relatively Easy Blog - Snakes: Nature’s Gravity Experiment - Make it stand out Coleslaw, my daughter’s corn snake, enjoys climbing, but has the heart of a ground snake. https://www.jriordon.com/relatively-easy-blog/what-happened-to-hawkings-theory-of-everything monthly 0.5 2025-11-26 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/b6d758b4-aad1-4384-902d-73e7f09c48ac/1000005074.jpg Relatively Easy Blog - What Happened to Hawking’s Theory of Everything? - Make it stand out My careworn copy of Hawking’s amazing book, A brief History of Time. https://www.jriordon.com/relatively-easy-blog/gravitational-wave-detector-on-the-moon monthly 0.5 2025-11-26 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/f37d7e39-7252-4eca-b7d2-166aa4bbffa7/ALSEP_AS17-134-20501.jpg Relatively Easy Blog - The Sad Story of the Gravitational Wave Detector on the Moon - Make it stand out Joseph Weber’s Lunar Surface Gravimeter as installed on the moon by Apollo 17 astronauts in 1972. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/092cbcca-a3ff-41a8-a3b7-55c7c51d1d67/sn-weber.jpg Relatively Easy Blog - The Sad Story of the Gravitational Wave Detector on the Moon - Make it stand out Joseph Weber installs innovative strain sensors on an aluminum bar to detect the passing of graitational waves. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/63608401-5ad8-43fb-8460-dd7cab505ae8/Reduced_Gravity_Walking_Simulator_-_NASA_1963.jpg Relatively Easy Blog - The Sad Story of the Gravitational Wave Detector on the Moon - Make it stand out Simulating lunar gravity. By dangling astronauts or instruments at an angle, NASA technicians could simulate the effects of the moon’s gravity, which is 1/6 the gravity on Earth. ~NASA https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/545d55bb-7129-44cd-b10e-68960ea15995/PXL_20240419_220559071.jpg Relatively Easy Blog - The Sad Story of the Gravitational Wave Detector on the Moon - Make it stand out The Joseph Weber memorial garden at the University of Maryland features eight of the prototype aluminum bars that Weber hoped would ring when pinged by passing gravitational waves. ~James Riordon https://www.jriordon.com/relatively-easy-blog/oppenheimers-frozen-star-fallacy monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/a132a3e5-0fba-4fd4-a459-f5805162637b/Einstein_oppenheimer.jpg Relatively Easy Blog - Oppenheimer’s Biggest Blunder: Frozen Stars - Make it stand out Einstein and Oppenheimer in the 1950s, when Oppenheimer thought most black holes were really stars frozen in mid-collapse and Einstein didn’t believe in black holes at all. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/cbe3d07a-8a80-4a43-90cc-5821872fbd9f/Screenshot+2025-11-11+061017.png Relatively Easy Blog - Oppenheimer’s Biggest Blunder: Frozen Stars - Make it stand out This is a portion of Kip Thorne’s illustration using ants to explain why a “frozen star” is an illusion, and that sufficiently massive stellar cores left over after supernovas never slow, from any perspective, as they collapse to become black holes. ~Scientific American, November 1967, page 96. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/70a338a0-ea63-4707-bd42-13b76039c29f/Screenshot+2025-11-10+at+12.44.20%E2%80%AFPM.png Relatively Easy Blog - Oppenheimer’s Biggest Blunder: Frozen Stars - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.jriordon.com/relatively-easy-blog/the-relativistic-effect-youve-never-heard-of monthly 0.5 2025-11-26 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/cfa0a2db-50e7-4792-9c8d-1a2796054098/Mercury+Perihelion+Precession.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out The ellipse of Mercury’s orbit precesses due to interactions with the other planets, the shape of the Sun, and three relativistic effects that were unexplainable before Einstein came along. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/70b5f031-eb16-4e86-b44b-4edfd435c501/Screenshot+2025-11-05+051635.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/7b6ed923-4876-47a6-9914-3233654c7736/Screenshot+2025-11-05+at+1.04.18%E2%80%AFPM.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/5cce29ad-a5a2-4f97-9d7c-26412b5d5be2/Screenshot+2025-11-05+at+1.04.29%E2%80%AFPM.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/33eac9b3-65c1-4cb5-b05c-a1ad58512a2c/Screenshot+2025-11-05+at+1.04.51%E2%80%AFPM.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/7ed04619-c8de-4240-9e33-8a4312629fc1/Screenshot+2025-11-06+at+5.48.49%E2%80%AFAM.png Relatively Easy Blog - The One Orbital Effect You’ve Never Heard of - Make it stand out To share the math fun with motivated readers, I left some values for the precession of Mars out of the table. Units here are arcseconds per century. https://www.jriordon.com/relatively-easy-blog/could-you-call-a-black-hole-home monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/01da6496-e6d2-454a-8c72-672d2cc19398/BlackHoleRealest.jpg Relatively Easy Blog - Could You Live Inside a Black Hole? (TL;DR: Yes, you could.) - Make it stand out Your forever home could be in a black hole. It would be a pretty comfortable neighborhood with plenty of elbow room, provided you find real estate in a rapidly spinning, supermassive black hole. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/73f41451-f20e-46f3-b141-3eb2c21e4483/Ergosphere_and_event_horizon_of_a_rotating_black_hole_%28no_animation%29.gif Relatively Easy Blog - Could You Live Inside a Black Hole? (TL;DR: Yes, you could.) - Make it stand out When black holes spin, they develop a structure that includes regions and surfaces that don’t exist in non-spinning black holes. Anything falling in winds up in a shell at the inner horizon. Freely falling material in the dark central region is hurled outward and ends up joining the inner horizon shell as well. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/eda778b8-3709-4969-979b-a1b0d9db71f1/Screenshot+2025-01-03+173008.png Relatively Easy Blog - Could You Live Inside a Black Hole? (TL;DR: Yes, you could.) - Make it stand out Possible orbits for objects (outer petals) and light (inner ruffle) inside the inner (Cauchy) horizon of a spinning black hole. Dokuchaev, Vyacheslav I. "Life inside black holes." Gravitation and Cosmology 18.1 (2012): 65-69. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/aee26b62-dee9-4c0c-8307-28591b765950/_f668381a-c0d4-4720-89b7-008bd70c0ec2.jpeg Relatively Easy Blog - Could You Live Inside a Black Hole? (TL;DR: Yes, you could.) - Make it stand out Packing up to move into a black hole is a one-way proposition, unless it’s the entrance to a wormhole that leads to a white hole somewhere else. https://www.jriordon.com/relatively-easy-blog/surviving-inside-a-black-hole monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/77227862-ebd5-46af-8788-35151c6f1fc8/Spaghettification_%28from_NASA%27s_Imagine_the_Universe%21%29.png Relatively Easy Blog - Death by Black Hole? You might survive diving in after all. - Make it stand out Black hole spaghettification, as envisioned by NASA. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/73f41451-f20e-46f3-b141-3eb2c21e4483/Ergosphere_and_event_horizon_of_a_rotating_black_hole_%28no_animation%29.gif Relatively Easy Blog - Death by Black Hole? You might survive diving in after all. - Make it stand out In a spinning black hole, material free-falling inside the dark colored region inside the inner horizon is hurled outward, and material outside the inner horizon falls inward. In this sketch, the central ringularity is not shown. Image courtesy of Yukterez (Simon Tyran, Vienna) https://www.jriordon.com/relatively-easy-blog/stop-lying-about-gravity monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/edfe3ec9-1a21-428f-9323-89023a0c95b3/Screenshot+2025-10-30+082047.png Relatively Easy Blog - Let’s Stop Lying to Kids About Gravity - Make it stand out A smattering of the countless Einstein-right-again headlines. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/b0ba20b4-3aef-40a0-8a99-65e8ce970c07/Mercury_Perihelion.png Relatively Easy Blog - Let’s Stop Lying to Kids About Gravity - Make it stand out The orbit of Mercury swings around the Sun in a way relativity explains, but Newton’s gravity can’t. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/43dc9341-6b61-4c94-a400-0594af279d33/El_pesado_del_coraz%C3%B3n_en_el_Papiro_de_Hunefer.jpg Relatively Easy Blog - Let’s Stop Lying to Kids About Gravity - Make it stand out Scales — measuring relativity’s effects for millennia. https://www.jriordon.com/relatively-easy-blog/gravity-is-not-geometry-said-einstein monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/a3a5d47b-0cb4-4079-af8a-82399bea69b2/einstein_journals_habit.jpg Relatively Easy Blog - Gravity isn’t Geometry, according to Einstein - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/1761569310320-UPDES5WJ98A3FVLWBGGQ/1920x1080.jpg Relatively Easy Blog - Gravity isn’t Geometry, according to Einstein - Make it stand out Warped spacetime offers one explanation for the displacement in the apparent location of a distant star. See the diagram below for another explanation. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/57fb12b2-a38c-47e3-9312-ae3c9ba492a5/VER_+speed+of+spaceLightAroundSun.jpg Relatively Easy Blog - Gravity isn’t Geometry, according to Einstein - Make it stand out Instead of following a straight line in warped spacetime, in Gullstrand-Painlevé coordinates, the path that light takes is bent as it passes through a current of flowing space. Either interpretation leads to the same prediction for things like the gravitational deflection of light around stars, black holes, or other massive objects. https://www.jriordon.com/relatively-easy-blog/einstein-black-hole-error monthly 0.5 2025-11-01 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/18008835-d1fb-41ce-b9b2-05e765cd35d5/M87.png Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out The black hole at the heart of galaxy M87 is the first one ever photographed. NASA scientists captured this image of the black hole in 2017. The M87 black hole is surrounded by the glow of material falling in and getting superheated on the way. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/c7b04ba0-b523-4215-ab2d-1d9e3fdcefe3/SMBH_Infinite_Loop-rev.gif Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out Gas glows brightly in this computer simulation of supermassive black holes only 40 orbits from merging. Credit: NASA's Goddard Space Flight Center https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/6c700210-56c4-4ed2-84fc-615827567644/1920x1080.jpg Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out A black hole warps spacetime in Einstein’s interpretation of relativity, which bends the path of light from a distant star. Image credit: NASA https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/a2453131-5330-4c6c-8fb7-5ee7a65decf2/9780262050982_00A_fig_001crop.jpg Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out Both the pattern that water forms when a stream hits the basin of your kitchen sink and the structure of basic black holes are simple in Gullstrand-Painlevé coordinates. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/a5607414-062b-4281-872b-db23fc65ab43/VER_DrainBH.jpg Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out For a black hole in the flowing space relativity of Gullstrand-Painlevé coordinates, finding the event horizon is easy — it’s where the speed of flowing space equals c. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/fcf0cf27-e31c-49c8-ba35-89aee9b50632/Screenshot+2025-11-01+062137.png Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out Note: I forgot to include the factor of 2 in a previous version of this post. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/b5ce91df-a1fe-4bd0-a7b9-42db0b5c7b6e/Screenshot+2025-11-01+062514.png Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/248769ad-a82c-4e7c-b2f1-c67f8736145c/Screenshot+2025-11-01+062559.png Relatively Easy Blog - Einstein’s Black Hole Error (and an Easy Fix) - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.jriordon.com/relatively-easy-blog/kitchen-sink-black-holes-part-3-gravitational-lensing monthly 0.5 2025-12-10 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/92eb3422-33a3-42fc-8c7c-52ab568f281b/VER_EddingtonFlipped.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 3 -Gravitational Lensing - Make it stand out The location of a distant star appears shifted away from its actual location due to light curving around a massive object. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/22b9e26b-7505-4614-96cd-0bbc8f4a0d95/Lensing2BW_GravitationalShift_cropped.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 3 -Gravitational Lensing - Make it stand out That apparent location of the wave source shifts as the ripples wrap around a kitchen sink white hole. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/96f3fcb5-a5ef-44fc-9ce4-494613c95165/Close-up_of_the_Einstein_ring_around_galaxy_NGC_6505_ESA506346.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 3 -Gravitational Lensing - Make it stand out Einstein Ring around the galaxy NGC 6505, captured by the European Space Agency’s Euclid space telescope. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/f9b7ebff-7122-4c00-9976-86e0629e174d/VER_EinsteinDots.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 3 -Gravitational Lensing - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.jriordon.com/relatively-easy-blog/the-black-hole-in-your-kitchen-sink-part-2-experiments monthly 0.5 2025-10-21 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/a2453131-5330-4c6c-8fb7-5ee7a65decf2/9780262050982_00A_fig_001crop.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 2 -Experiments - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/1b0e4862-fb6d-4a50-bc6f-09b2965bbb3a/PXL_20250409_074205216.MP.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 2 -Experiments - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/6a58c57d-71ac-4b2a-8963-58b63b02c338/Shock+waves1.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 2 -Experiments - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.jriordon.com/relatively-easy-blog/blog-post-title-one-mat4k-xf5rn-nflry monthly 0.5 2025-10-16 https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/8c3717dd-7600-4760-a903-66258974b2b4/RedBlackHoleSink.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 1 - Make it stand out There’s a lot more in common between black holes and the water in your kitchen sink than you might think. https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/bce07f26-7398-4fa9-9ec9-ca852a517091/Black+hole+eating+star.webp Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 1 - Make it stand out Artist’s vision of one of three black holes NASA astronomers recently discovered feasting on their companion stars. — Image courtesy of NASA https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/f017c2ff-9507-4bbb-b773-9f336f1d0ccf/sgr_lg.webp Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 1 - Make it stand out Supermassive black hole Sagittarius A* (Sgr A*) is located in the middle of the Milky Way galaxy. — Image courtesy of NASA https://images.squarespace-cdn.com/content/v1/68cdd4e649dd3346ce62e278/ad430dfe-4d84-4099-9a42-5c1456d174bd/978026205982_00A_fig_001.jpg Relatively Easy Blog - The Black Hole in Your Kitchen Sink, Part 1 - Make it stand out A stream of water spreads out when it hits a smooth surface, creating a pattern with features comparable to those of black and white holes in space. https://www.jriordon.com/relatively-easy-blog/category/Einstein monthly 0.5 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