#Atomic Clocks

“We are running out of time.” Atomic scientists set the "Doomsday Clock" to 85 seconds to midnight, the closest it has ever been, warning that nuclear risk, climate change, and artificial intelligence are pushing humanity closer to catastrophe. First established in 1947 by the Bulletin of the Atomic Scientists, the "Doomsday Clock" is a symbolic measure that represents how close humanity is to destroying our own world through disruptive technologies. By moving the clock four seconds closer since 2025, the Bulletin says the world is now unacceptably close to a theoretical annihilation—an urgent warning that immediate action is needed to change course. Read more on why scientists say time is running out at the link in bio.

This is the clock that runs all other clocks Time is actively being monitored around the world by something called an atomic clock. This clock keeps pace for everything in our modern world, coordinating everything from GPS to the stock market. There’s an entire group that helps monitor the atomic clock in the US and it’s called the National Institute of Standards and Technology that handles over 100 billion time coordination requests daily. Sometimes the “timekeepers” will add a leap second to the atomic clocks to keep time in sync with the Earth. Since 1972, we added 27 seconds. But now for the trust time ever, geophysicists will need to subtract a second in 2029. Why? Head to the video for the full explanation! #timetravel #science #geology #earth #clock

On January 28th, the Bulletin's Science and Security Board will reveal the 2025 Doomsday Clock time in Washington, DC with an accompanying livestream. The Doomsday Clock is a design that warns the public about how close we are to destroying our world with dangerous technologies of our own making. It is a metaphor, a reminder of the perils we must address if we are to survive on the planet. It was created in 1947. Read more about the Doomsday Clock, this year's speakers, and how to watch via the link in our profile.

For most of human history, time was measured by the motion of the sky the rising and setting of the Sun, governed by the steady rotation of Earth. It seemed perfectly regular, like a cosmic clock that never drifted. But the truth turned out to be more subtle. Earth does not spin with absolute precision. Its rotation gradually slows over time due to gravitational interactions, especially with the Moon, a process explained by Tidal friction. As the oceans bulge slightly toward the Moon, energy is dissipated, stealing a tiny bit of Earth's rotational speed. The difference is incredibly small. A single day becomes longer by only milliseconds over many years far too little to notice in daily life. Yet modern atomic clocks are so precise that they detect this drift. To keep our timekeeping aligned with Earth's actual rotation, scientists occasionally add an extra second to our clocks. This adjustment is known as the Leap second. It is a reminder that even timekeeping is not perfectly rigid. Our wristwatches and digital clocks measure time with extreme accuracy, but the planet itself the reference for day and night is slowly changing its rhythm due to natural forces acting over billions of years. A planet, subtly losing speed. Earth's rotation has been slowing since the age of the dinosaurs, lengthening the day from about 22 hours in the distant past to the 24 hours we experience today. The change continues, almost imperceptibly, shaping the long-term history of our world. And in the video, Neil deGrasse Tyson reveals this quiet secret of Earth's motion that the planet beneath our feet is not spinning with perfect constancy, and that from time to time, our precise clocks must pause for a single second to stay in step with the slow, evolving rhythm of the Earth itself. 🌍⏱️ Speaker: @profbriancox #space #universe #astronomy #sun #time Star Talk YT Neildegrassetyson short YT

A pulsar is what remains after a massive star ends its life in a supernova—an ultra-dense neutron star, spinning at incredible speeds. As it rotates, it emits powerful beams of radiation from its magnetic poles. If those beams sweep past Earth, we detect them as perfectly timed pulses—like a cosmic lighthouse flashing across the universe. These pulses are so precise that some rival atomic clocks in accuracy, helping scientists study extreme physics, gravity, and even the fabric of space-time itself. . . . #pulsar #universe #space #neutronstar #astrophysics

Time is not that things Which we thing sooo.... Time is not something you can physically grab or directly measure like length or mass. Instead: We define time using repeating natural processes For example: Earth’s rotation → gives us a day Vibrations of atoms → used in atomic clocks Real definition (scientific view): Modern science defines time using atomic clocks based on the vibrations of atoms like cesium. #time #science #paradox #physics

No problem! Here’s the information about the Precision Tests of Time Dilation with Atomic Clocks ⏱ →𝐂𝐫/𝐄𝐝𝐢𝐭𝐞𝐝 𝐁𝐲: →𝐃𝐦 𝐟𝐨𝐫 𝐑𝐞𝐦𝐨𝐯𝐚𝐥 →𝐅𝐨𝐥𝐥𝐨𝐰 𝐅𝐨𝐫 𝐌𝐨𝐫𝐞! 🔹 What Was Tested? • Time dilation, a cornerstone of special relativity, states that time moves slower for objects traveling at high speeds. 🚀🕒 • This was tested using ultra-precise atomic clocks onboard fast-moving planes and satellites. 🔹 Key Experiments 1️⃣ Hafele-Keating Experiment (1971): • Atomic clocks were flown around the world on commercial jets. • Result: Clocks onboard planes differed by ~273 nanoseconds, matching relativity’s predictions. ✈️✅ 2️⃣ GPS Satellites: • Atomic clocks onboard satellites move faster than those on Earth by ~38 microseconds/day due to general and special relativity. 🌍📡 🔹 Impact on Physics • These experiments directly confirmed Einstein’s theory and are critical for technologies like GPS navigation, which relies on relativistic corrections. 🌌🔧 ✨ QUIZ TIME ✨ What did atomic clock experiments confirm? a) Time flows slower at high speeds 🟢 b) Atomic clocks are unreliable in space 🔴 c) Time flows faster at high speeds ⚪ #dextermorgan #dexter #fyp #edit #dextertv #cinedt

The Climate Clock is a powerful reminder of how little time remains to act on the climate crisis. It counts down the years, days, and seconds until global warming reaches critical levels — while also showing the growth of renewable energy worldwide. Every solar panel installed, every battery added, and every sustainable choice helps push that clock back. Credit: @christianjmaldonado #ClimateAction #ClimateClock #RenewableEnergy #SustainableFuture #SolarEnergy #GreenLiving #CleanEnergySolutions #CarbonFreeFuture #PowerWithPurpose #NetZero #ActOnClimate #UKSolar

All Roads Lead to Rome ⏱️ 76 Clocks, Animated by Me 🦍 #要怎麼不經意的讓另

✨💫🤯🛰️Pulsars spin so fast they make black holes look calm.🌌 Black holes are often considered the most fascinating objects in the universe—regions where gravity is so powerful that not even light can escape. Yet, pulsars can be even more astonishing. A pulsar is a type of neutron star, the collapsed core left behind after a massive star explodes as a supernova. These objects pack more mass than the Sun into a sphere only about 20 kilometers wide. What makes them extraordinary is their rotation speed and precision. Pulsars spin incredibly fast and emit beams of radiation from their magnetic poles. As the star rotates, these beams sweep across space like cosmic lighthouses. When the beam crosses Earth, astronomers detect a pulse—hence the name “pulsar.” Some of them rotate so fast that they rival the accuracy of atomic clocks. One famous example is the Vela Pulsar, located about 1,000 light-years away. It spins roughly 11 times per second, releasing powerful bursts of radio and gamma radiation. The Crab Pulsar, born from the supernova observed in 1054 AD, rotates about 30 times per second, producing intense radiation and energetic particle winds. Even more extreme are millisecond pulsars. PSR J0437-4715 spins around 174 times per second and is one of the closest known pulsars to Earth. PSR B1937+21, the first discovered millisecond pulsar, rotates at a staggering 642 times per second. The record holder is PSR J1748-2446ad, the fastest known spinning neutron star. It completes about 716 rotations every second, meaning its surface moves at nearly a quarter of the speed of light. While black holes dominate with gravity, pulsars showcase nature’s precision and speed. These rapidly spinning stellar corpses prove that the universe’s coolest objects are not always the darkest ones—they can also be the fastest.🌀🚀📡🌌☀️🌞🌟🌠💥 #astronomy #astrophotography #universe #space #blackhole

No problem! Here’s the information about the Precision Tests of Time Dilation with Atomic Clocks ⏱ →𝐂𝐫/𝐄𝐝𝐢𝐭𝐞𝐝 𝐁𝐲: hayat →𝐃𝐦 𝐟𝐨𝐫 𝐑𝐞𝐦𝐨𝐯𝐚𝐥 →𝐅𝐨𝐥𝐥𝐨𝐰 𝐅𝐨𝐫 𝐌𝐨𝐫𝐞! 🔹 What Was Tested? • Time dilation, a cornerstone of special relativity, states that time moves slower for objects traveling at high speeds. 🚀🕒 • This was tested using ultra-precise atomic clocks onboard fast-moving planes and satellites. 🔹 Key Experiments 1️⃣ Hafele-Keating Experiment (1971): • Atomic clocks were flown around the world on commercial jets. • Result: Clocks onboard planes differed by ~273 nanoseconds, matching relativity’s predictions. ✈️✅ 2️⃣ GPS Satellites: • Atomic clocks onboard satellites move faster than those on Earth by ~38 microseconds/day due to general and special relativity. 🌍📡 🔹 Impact on Physics • These experiments directly confirmed Einstein’s theory and are critical for technologies like GPS navigation, which relies on relativistic corrections. 🌌🔧 ✨ QUIZ TIME ✨ What did atomic clock experiments confirm? a) Time flows slower at high speeds 🟢 b) Atomic clocks are unreliable in space 🔴 c) Time flows faster at high speeds ⚪ #dextermorgan #dexter #fyp #edit #dextertv #cinedt

For most of human history, time was measured by the motion of the sky the rising and setting of the Sun, governed by the steady rotation of Earth. It seemed perfectly regular, like a cosmic clock that never drifted. But the truth turned out to be more subtle. Earth does not spin with absolute precision. Its rotation gradually slows over time due to gravitational interactions, especially with the Moon, a process explained by Tidal friction. As the oceans bulge slightly toward the Moon, energy is dissipated, stealing a tiny bit of Earth's rotational speed. The difference is incredibly small. A single day becomes longer by only milliseconds over many years far too little to notice in daily life. Yet modern atomic clocks are so precise that they detect this drift. To keep our timekeeping aligned with Earth's actual rotation, scientists occasionally add an extra second to our clocks. This adjustment is known as the Leap second. It is a reminder that even timekeeping is not perfectly rigid. Our wristwatches and digital clocks measure time with extreme accuracy, but the planet itself the reference for day and night is slowly changing its rhythm due to natural forces acting over billions of years. A planet, subtly losing speed. Earth's rotation has been slowing since the age of the dinosaurs, lengthening the day from about 22 hours in the distant past to the 24 hours we experience today. The change continues, almost imperceptibly, shaping the long-term history of our world. And in the video, Neil deGrasse Tyson reveals this quiet secret of Earth's motion that the planet beneath our feet is not spinning with perfect constancy, and that from time to time, our precise clocks must pause for a single second to stay in step with the slow, evolving rhythm of the Earth itself. Speaker: @neildegrassetyson Credit: skytalk #space #universe #astronomy #sun #time Neildegrassetyson short YT