This is an open and broad curation of ideas, thoughts, and projects exploring the frontiers of science, technology, and innovation.https://www.danbgray.com/2026-09-07T00:00:00ZDaniel GrayIkonic glasshttps://www.danbgray.com/this-site-runs-on-ikonic2026-09-07T00:00:00Z2026-09-07T00:00:00Z

For years this site was a Next.js app that read my Obsidian vault and turned it into pages. That worked, and for a while I wrote about how. It is not how the site works any more; the whole journey is in From Obsidian to Ikonic. What you are reading now is published by Ikonic, and this note is about what that means.

Daniel Grayhttps://www.danbgray.com/getting-around2026-09-07T00:00:00Z2026-09-07T00:00:00Z

This site is published by Ikonic, and Ikonic is something you talk to. Here is how to get around, whether you talk, type, or click. The longer story of why it works this way is in This Site Runs on Ikonic.

Daniel Grayhttps://www.danbgray.com/from-obsidian-to-ikonic2026-09-07T00:00:00Z2026-09-07T00:00:00Z

This site has had three lives. The notes are the same notes. What changed is the thing that turns them into a website, and this is the story of that, because the third life is the one I am building everything else on.

Daniel Grayhttps://www.danbgray.com/designing-a-3d-solar-system-browser2026-03-24T00:00:00Z2026-03-24T00:00:00Z

When I set out to build this blog, I knew I wanted to create something that went beyond just writing about science—I wanted to create an experience that captures the wonder and excitement I felt when I first studied planetary science. The result is an interactive 3D solar system browser that lets visitors explore our cosmic neighborhood in a way that's both educational and genuinely fun.

Daniel Grayhttps://www.danbgray.com/planetary-science-space2026-03-21T00:00:00Z2026-03-21T00:00:00Z

Explore our solar system in 3D. Click on planets and moons to view articles about them. Use the date selector to see planetary positions at different times, and adjust the time speed to watch orbits in action.

Daniel Grayhttps://www.danbgray.com/venus2026-03-19T00:00:00Z2026-03-19T00:00:00Z

Venus is often called Earth's twin due to its similar size and mass, but the two planets could not be more different. While Earth is a haven for life, Venus is a hellish world with surface temperatures hot enough to melt lead (465°C/870°F), crushing atmospheric pressure 92 times that of Earth, and clouds of sulfuric acid. This extreme environment is the result of a runaway greenhouse effect that…

Daniel Grayhttps://www.danbgray.com/uranus2026-03-17T00:00:00Z2026-03-17T00:00:00Z

Uranus is unique among the planets: it rotates on its side, with an axial tilt of 98 degrees that creates extreme seasonal variations unlike any other planet. This unusual orientation, combined with its position as the first ice giant (composed primarily of water, methane, and ammonia ices rather than hydrogen and helium), makes Uranus one of the most enigmatic planets in the solar system. The…

Daniel Grayhttps://www.danbgray.com/umbriel2026-03-15T00:00:00Z2026-03-15T00:00:00Z

Umbriel is the third-largest of Uranus's five major moons and the darkest, with an albedo of only 0.19. The moon has a heavily cratered, ancient surface that shows no signs of recent geological activity, making it a time capsule of the early solar system. Umbriel's most distinctive feature is Wunda crater, a bright ring of material that stands out against the dark surface. The moon's dark…

Daniel Grayhttps://www.danbgray.com/triton2026-03-13T00:00:00Z2026-03-13T00:00:00Z

Triton is Neptune's largest moon and one of the most fascinating worlds in the outer solar system. The moon orbits retrograde (backward), indicating it was likely captured from the … rather than forming with Neptune. Triton has a young, geologically active surface with few craters, geysers of nitrogen gas, and a thin nitrogen atmosphere. The geysers, discovered by … 2, erupt dark material that…

Daniel Grayhttps://www.danbgray.com/titania2026-03-11T00:00:00Z2026-03-11T00:00:00Z

Titania is the largest of Uranus's five major moons, with a radius of 788 km. The moon has a mix of ancient, heavily cratered terrain and younger regions with extensive canyon systems, suggesting past geological activity. Titania's canyons, some hundreds of kilometers long and up to 5 km deep, indicate significant tectonic activity in the past. The moon shows evidence of past resurfacing, with…

Daniel Grayhttps://www.danbgray.com/titan2026-03-09T00:00:00Z2026-03-09T00:00:00Z

Titan is unique in the solar system: the only moon with a thick atmosphere and the only world besides Earth with stable liquid on its surface. But Titan's lakes and seas aren't filled with water—they're filled with liquid methane and ethane, creating a hydrocarbon cycle analogous to Earth's water cycle. The Cassini-Huygens mission revealed Titan as a complex, Earth-like world with rivers, lakes,…

Daniel Grayhttps://www.danbgray.com/tethys2026-03-06T00:00:00Z2026-03-06T00:00:00Z

Tethys is one of Saturn's mid-sized moons, notable for its massive … and the giant canyon … that stretches three-quarters of the way around the moon. The crater, 400 km across, is nearly half the moon's diameter and was created by an impact that likely came close to shattering Tethys. …, a canyon system 100 km wide and 3-5 km deep, may have formed as a result of the … impact or from other…

Daniel Grayhttps://www.danbgray.com/sun2026-03-04T00:00:00Z2026-03-04T00:00:00Z

The Sun is the heart of our solar system—a massive, luminous sphere of plasma that has burned for 4.6 billion years and will continue for billions more. As a G-type main-sequence star, the Sun converts hydrogen into helium through nuclear fusion in its core, releasing the energy that powers life on Earth and drives the dynamics of all planets, moons, and smaller bodies. The Sun's influence…

Daniel Grayhttps://www.danbgray.com/saturn2026-03-02T00:00:00Z2026-03-02T00:00:00Z

Saturn is instantly recognizable by its spectacular ring system—the most extensive and visible in the solar system. These rings, composed of countless ice and rock particles, create a breathtaking sight that has fascinated astronomers since … first observed them in 1610. But Saturn is far more than its rings: it's a gas giant second only to Jupiter in size, with 146 known moons including Titan—a…

Daniel Grayhttps://www.danbgray.com/rhea2026-02-28T00:00:00Z2026-02-28T00:00:00Z

Rhea is Saturn's second-largest moon after Titan, with a radius of 764 km. The moon has a heavily cratered, ancient surface that shows no signs of recent geological activity. Rhea is composed primarily of water ice with a small amount of rock, and recent observations have suggested it may have a tenuous atmosphere of oxygen and carbon dioxide, though this remains uncertain. The moon's surface is…

Daniel Grayhttps://www.danbgray.com/phobos2026-02-26T00:00:00Z2026-02-26T00:00:00Z

Phobos is the larger and closer of Mars's two small moons, orbiting just 6,000 km above the Martian surface—closer than any other moon to its planet. This proximity means Phobos completes an orbit in just 7.65 hours, rising and setting twice each Martian day. But Phobos's close orbit is also its doom: tidal forces are causing its orbit to decay, and in approximately 50 million years, Phobos will…

Daniel Grayhttps://www.danbgray.com/oberon2026-02-24T00:00:00Z2026-02-24T00:00:00Z

Oberon is the second-largest and outermost of Uranus's five major moons, with a radius of 761 km. The moon has a heavily cratered, ancient surface that shows no signs of recent geological activity, making it a time capsule of the early solar system. Oberon's surface is dark and dominated by impact craters, with the largest being Hamlet, 206 km across. The moon shows some evidence of past…

Daniel Grayhttps://www.danbgray.com/nereid2026-02-22T00:00:00Z2026-02-22T00:00:00Z

Nereid is Neptune's third-largest moon and has the most eccentric orbit of any moon in the solar system, ranging from 1.4 to 9.7 million kilometers from Neptune. The moon's highly elliptical orbit and irregular shape suggest it may be a captured asteroid or … object. Nereid's orbit takes it from very close to Neptune to very far away, creating extreme variations in its environment. The moon has…

Daniel Grayhttps://www.danbgray.com/neptune2026-02-19T00:00:00Z2026-02-19T00:00:00Z

Neptune is the farthest planet from the Sun and the windiest world in the solar system, with winds reaching speeds of 2,100 km/h (580 m/s)—nearly supersonic. The planet's deep blue color, more vivid than Uranus's pale blue-green, comes from methane in its atmosphere absorbing red light. Neptune is an ice giant, similar to Uranus but with important differences: it radiates 2.6 times more heat…

Daniel Grayhttps://www.danbgray.com/moon2026-02-17T00:00:00Z2026-02-17T00:00:00Z

Its presence has shaped Earth in profound ways: stabilizing Earth's axial tilt, creating tides, and possibly playing a role in the origin of life. The Moon's synchronous rotation means we only ever see one face from Earth, but the far side, first imaged by the Soviet Luna 3 mission in 1959, revealed a dramatically different landscape. The Moon's surface tells a story of violent impacts, ancient…

Daniel Grayhttps://www.danbgray.com/miranda2026-02-15T00:00:00Z2026-02-15T00:00:00Z

Miranda is the smallest and innermost of Uranus's five major moons, but it has the most extreme and varied topography in the solar system. The moon's surface is a chaotic jumble of different terrain types—ancient, heavily cratered regions mixed with young, smooth areas, massive canyons, and unique features called "coronae" that are found nowhere else. Verona Rupes, a cliff 20 km high, is the…

Daniel Grayhttps://www.danbgray.com/mimas2026-02-13T00:00:00Z2026-02-13T00:00:00Z

Mimas is one of Saturn's inner moons, famous for its massive Herschel crater that makes it resemble the Death Star from Star Wars. The crater, which is 130 km across—nearly one-third of the moon's diameter—was created by an impact that came close to shattering Mimas completely. Despite its dramatic appearance, Mimas is a small, icy moon with a heavily cratered surface and no signs of recent…

Daniel Grayhttps://www.danbgray.com/mercury2026-02-11T00:00:00Z2026-02-11T00:00:00Z

Mercury is the smallest planet in the solar system and the closest to the Sun, orbiting at an average distance of just 0.39 astronomical units. Despite its proximity to the Sun, Mercury experiences some of the most extreme temperature variations in the solar system—from 430°C (800°F) during the day to -180°C (-290°F) at night. This harsh environment, combined with Mercury's unusual 3:2…

Daniel Grayhttps://www.danbgray.com/mars2026-02-09T00:00:00Z2026-02-09T00:00:00Z

Mars has captured human imagination for centuries, and today it's the primary target in the search for life beyond Earth. While Mars is currently cold and dry, evidence from orbiters and rovers reveals a past that was warmer and wetter—with rivers, lakes, and possibly even oceans. This ancient, habitable Mars may have hosted life, and if life existed, it might still survive in subsurface…

Daniel Grayhttps://www.danbgray.com/jupiter2026-02-07T00:00:00Z2026-02-07T00:00:00Z

Jupiter is the largest planet in the solar system, a gas giant so massive that it contains more than twice the mass of all other planets combined. With its iconic Great Red Spot—a storm larger than Earth that has raged for at least 400 years—and its system of 95 known moons including the four large …, Jupiter is a world of superlatives. The planet's immense gravity has shaped the solar system,…

Daniel Grayhttps://www.danbgray.com/io2026-02-04T00:00:00Z2026-02-04T00:00:00Z

Io is the most volcanically active body in the solar system, with hundreds of active volcanoes constantly reshaping its surface. This extreme activity is driven by tidal heating from Jupiter's immense gravity, which flexes Io's interior and generates more heat than radioactive decay. Io's surface is a kaleidoscope of colors—yellows, oranges, reds, and whites from sulfur and sulfur dioxide that…

Daniel Grayhttps://www.danbgray.com/iapetus2026-02-02T00:00:00Z2026-02-02T00:00:00Z

Iapetus is one of Saturn's most distinctive moons, famous for its two-tone coloration—one hemisphere is dark as coal while the other is bright as snow. The moon also has a mysterious equatorial ridge that wraps around its equator like a walnut, reaching heights of up to 20 km. The dark material, concentrated on the leading hemisphere, may be organic compounds or material from another moon, while…

Daniel Grayhttps://www.danbgray.com/hyperion2026-01-31T00:00:00Z2026-01-31T00:00:00Z

Hyperion is one of Saturn's most unusual moons—an irregular, potato-shaped object with a sponge-like appearance created by numerous deep, dark craters. The moon has chaotic rotation, tumbling unpredictably rather than rotating synchronously like most moons. Hyperion's low density and porous structure suggest it may be a rubble pile, and its surface is covered in dark material that may be organic…

Daniel Grayhttps://www.danbgray.com/giovanni-cassini2026-01-29T00:00:00Z2026-01-29T00:00:00Z

Giovanni Domenico Cassini (1625-1712) was an Italian-French astronomer who made fundamental discoveries about the solar system in the 17th century. He discovered four of Saturn's moons (Iapetus, Rhea, Tethys, and Dione), observed the gap in Saturn's rings that now bears his name (the Cassini Division), made precise measurements of planetary motions, and contributed to the understanding of…

Daniel Grayhttps://www.danbgray.com/ganymede2026-01-27T00:00:00Z2026-01-27T00:00:00Z

Ganymede is not just Jupiter's largest moon—it's the largest moon in the entire solar system, larger than Mercury and the only moon known to have its own magnetic field. Like Europa, Ganymede likely has a subsurface ocean, but its structure is more complex: multiple layers of ice and ocean, with a metallic core generating the magnetic field. The European Space Agency's JUICE mission will make…

Daniel Grayhttps://www.danbgray.com/europa2026-01-25T00:00:00Z2026-01-25T00:00:00Z

Beneath Europa's icy surface lies a global ocean—possibly twice the volume of Earth's oceans—making this Jovian moon one of the most promising places to search for life beyond Earth. Europa's ocean is kept liquid by tidal heating from Jupiter's immense gravity, creating conditions that could support life. While we haven't yet confirmed the ocean's existence or searched for life, upcoming…

Daniel Grayhttps://www.danbgray.com/enceladus2026-01-23T00:00:00Z2026-01-23T00:00:00Z

Enceladus is one of Saturn's most fascinating moons—a small, icy world with geysers erupting from its south pole, revealing a global subsurface ocean beneath an ice shell. The geysers, discovered by the Cassini mission, spew water vapor, ice particles, and organic compounds into space, creating one of Saturn's rings and providing direct access to the ocean below. Enceladus's ocean is kept liquid…

Daniel Grayhttps://www.danbgray.com/earth2026-01-20T00:00:00Z2026-01-20T00:00:00Z

Earth is the only known planet to harbor life, a distinction that makes it unique among the … in our galaxy. This uniqueness arises from a delicate balance of factors: Earth's position in the Sun's habitable zone, its protective magnetic field, a stable atmosphere with the right composition, liquid water covering 71% of its surface, and active geological processes that recycle nutrients and…

Daniel Grayhttps://www.danbgray.com/dione2026-01-18T00:00:00Z2026-01-18T00:00:00Z

Dione is one of Saturn's mid-sized moons, notable for its "wispy terrain"—bright, linear features that crisscross parts of its surface. These features, discovered by …, were revealed by Cassini to be ice cliffs created by tectonic activity. Dione is in orbital resonance with Enceladus, helping maintain Enceladus's eccentricity and enabling its tidal heating. The moon has a heavily cratered…

Daniel Grayhttps://www.danbgray.com/deimos2026-01-16T00:00:00Z2026-01-16T00:00:00Z

Deimos is the smaller and more distant of Mars's two moons, orbiting at 23,460 km from the planet's surface. Unlike its companion Phobos, which is doomed to destruction, Deimos is slowly drifting away from Mars and will eventually escape the planet's gravity. Deimos is an irregular, heavily cratered body that appears smooth from a distance but is actually covered in regolith that fills in…

Daniel Grayhttps://www.danbgray.com/cassini2026-01-14T00:00:00Z2026-01-14T00:00:00Z

The Cassini-Huygens mission was one of the most ambitious and successful planetary exploration missions ever undertaken. Launched in 1997, the Cassini spacecraft spent 13 years orbiting Saturn, studying the planet, its rings, and its moons in unprecedented detail. The Huygens probe, carried by Cassini, made the first landing on an outer solar system moon when it descended to the surface of Titan…

Daniel Grayhttps://www.danbgray.com/callisto2026-01-12T00:00:00Z2026-01-12T00:00:00Z

Callisto is the outermost of Jupiter's four large Galilean moons and the most heavily cratered object in the solar system. Its ancient, unchanged surface preserves a record of impacts spanning billions of years, making it a window into the early solar system. Unlike its siblings Io, Europa, and Ganymede, Callisto shows no signs of recent geological activity—no volcanism, no resurfacing, no…

Daniel Grayhttps://www.danbgray.com/ariel2026-01-10T00:00:00Z2026-01-10T00:00:00Z

Ariel is the fourth-largest of Uranus's five major moons and has the youngest, most geologically active surface of the group. The moon is crisscrossed by extensive fault systems and canyons, evidence of past tectonic activity that may have been driven by tidal heating or other processes. Ariel's surface shows a mix of heavily cratered ancient terrain and smooth, young regions that have been…

Daniel Grayhttps://www.danbgray.com/airship-to-orbit2026-01-08T00:00:00Z2026-01-08T00:00:00Z

What if we could reach orbit without rockets? The "airship to orbit" concept proposes using a massive lighter-than-air vehicle to ascend through the atmosphere, gradually accelerating until it reaches orbital velocity. This seemingly science-fictional idea has been seriously proposed as a way to dramatically reduce the cost of reaching space. While the concept faces enormous engineering…

Daniel Grayhttps://www.danbgray.com/turing-machines-series-index2025-12-16T00:00:00Z2025-12-16T00:00:00Z

Welcome to the Turing Machines series! This comprehensive guide explores one of the most fundamental concepts in Computer Science and Discrete Mathematics—the Advanced Turing Machine Concepts—through interactive visualization, practical examples, and deep theoretical understanding.

Daniel Grayhttps://www.danbgray.com/introduction-to-turing-machines2025-12-16T00:00:00Z2025-12-16T00:00:00Z

This is Part 2 of the Turing Machines series. Here we explore the foundational concepts, historical context, and mathematical structure of Turing machines—one of the most important models in Computer Science and Discrete Mathematics.

Daniel Grayhttps://www.danbgray.com/qubits2025-12-15T00:00:00Z2025-12-15T00:00:00Z

A qubit (quantum bit) is the fundamental unit of quantum information, analogous to the classical bit but with fundamentally different properties. While a classical bit can only be 0 or 1, a qubit can exist in a superposition of both states simultaneously, enabling quantum computers to process information in ways impossible for classical computers. This superposition, combined with entanglement…

Daniel Grayhttps://www.danbgray.com/building-your-first-turing-machine2025-12-13T00:00:00Z2025-12-13T00:00:00Z

This is Part 5 of the Turing Machines series. Here we walk through building Turing machines step by step, from simple examples to more complex problems. We'll use practical examples you can try on turingmachine.io.

Daniel Grayhttps://www.danbgray.com/advanced-turing-machine-concepts2025-12-13T00:00:00Z2025-12-13T00:00:00Z

This is Part 6 of the Turing Machines series. Here we explore advanced topics including computability theory, complexity theory, variations of Turing machines, and connections to other areas of Computer Science and Discrete Mathematics.

Daniel Grayhttps://www.danbgray.com/understanding-state-diagrams2025-12-12T00:00:00Z2025-12-12T00:00:00Z

This is Part 3 of the Turing Machines series. Here we explore how Turing machines are visually represented through state diagrams and how to read and understand these powerful visual tools.

Daniel Grayhttps://www.danbgray.com/exploring-turingmachine-io2025-12-12T00:00:00Z2025-12-12T00:00:00Z

This is Part 4 of the Turing Machines series. Here we provide a comprehensive hands-on guide to turingmachine.io, an interactive visualization tool that makes Turing machines accessible and engaging.

Daniel Grayhttps://www.danbgray.com/closed-poloidal-loops2025-11-20T00:00:00Z2025-11-20T00:00:00Z

Closed poloidal loops are a fundamental concept in magnetic confinement fusion, referring to magnetic field lines that form closed loops in the poloidal (toroidal minor radius) direction. In field-reversed configurations (FRCs) and other fusion devices, closed poloidal loops are essential for plasma confinement—they create a boundary between the confined plasma and the external region.…

Daniel Grayhttps://www.danbgray.com/xpeng2025-10-25T00:00:00Z2025-10-25T00:00:00Z

Xpeng (NYSE: XPEV) is a Chinese electric vehicle manufacturer that has developed a flying car prototype and is working on robotics. The company is one of China's leading EV manufacturers, competing with Tesla, NIO, and others in the Chinese market. Xpeng's expansion into flying cars and robotics represents the company's broader vision of future mobility and technology.

Daniel Grayhttps://www.danbgray.com/tokamak2025-05-25T00:00:00Z2025-05-25T00:00:00Z

For over half a century, the tokamak has been the workhorse of fusion energy research—a donut-shaped device that uses powerful magnetic fields to contain plasma hot enough to fuse atomic nuclei. While tokamaks have achieved remarkable progress, including recent breakthroughs at ITER and private facilities, they face enormous engineering and economic challenges. The path to practical fusion power…

Daniel Grayhttps://www.danbgray.com/performance-optimization2025-03-10T00:00:00Z2025-03-10T00:00:00Z

Performance was critical: this needs to run smoothly in a variety of environments, from high-end desktops to mobile devices. This article covers the key optimizations implemented.

Daniel Gray