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Colder Than Outer Space: How Scientists Created the Coldest Temperature Ever in a Lab

MIT scientists hit a record low of 38 trillionths of a Kelvin above absolute zero — here's how and why it matters

Imagine a place colder than the darkest, deepest parts of outer space — a temperature so low that atoms nearly stop moving. Sounds like science fiction? It's not.

Scientists at the Massachusetts Institute of Technology (MIT) have achieved something extraordinary. In a groundbreaking experiment, they created the coldest temperature ever recorded on Earth — just 38 trillionths of a degree above absolute zero. That’s 0.000000000000038 Kelvin.

To put it into perspective, this is colder than space, colder than any natural environment, and colder than anything we’ve ever experienced. It’s a scientific achievement that pushes the boundaries of physics and opens new doors for quantum research.

Let’s dive into this icy world and uncover how they did it, why it matters, and what this means for the future of science and technology.

❄️ What Is Absolute Zero?

Before we understand this achievement, we need to know what absolute zero really means.

  • Absolute zero is the lowest temperature possible.

  • It’s 0 Kelvin, or -273.15°C (or -459.67°F).

  • At this temperature, atoms stop moving entirely. They are at their lowest energy state.

In theory, nothing can be colder than absolute zero because temperature is a measure of motion. If there's no motion at all, there's no temperature.

Although we can’t reach absolute zero perfectly, scientists can get very, very close — and that’s what makes this MIT experiment so special.

🧪 The Record-Breaking Experiment

👨‍🔬 Who Did It?

The experiment was conducted by a team of physicists at the Massachusetts Institute of Technology (MIT).

🧊 What Did They Use?

They worked with ultracold sodium-potassium (NaK) molecules, which are a special kind of hybrid atoms.

📉 How Cold Did It Get?

They achieved a temperature of 38 picokelvin — that's:

  • 38 trillionths of a Kelvin

  • 0.000000000000038 K

  • Much colder than outer space (which is around 2.7 K)

🧬 How Did They Achieve Such Cold?

Reaching these incredibly low temperatures isn’t as easy as turning down a thermostat. Here's a simplified step-by-step explanation of how scientists did it:

1. Laser Cooling

  • Scientists used laser beams to slow down the atoms.

  • Light can apply pressure on atoms. By tuning lasers precisely, they made atoms move slower — and slower motion = lower temperature.

2. Magnetic Trapping

  • Once the atoms were cooled down, they were placed in a magnetic field.

  • The magnetic field kept the atoms from touching the walls of the container, which would warm them up.

3. Evaporative Cooling

  • Similar to how sweating cools you down, scientists removed the fastest (hottest) atoms.

  • The leftover atoms were colder as a result.

4. Molecule Formation

  • They combined sodium (Na) and potassium (K) atoms to form ultracold molecules.

  • These molecules were extremely stable and could be cooled further.

5. Quantum State Control

  • The real magic happened by manipulating the quantum states of these molecules.

  • With extreme precision, scientists were able to bring the system to just above absolute zero.

🌠 Why Is This Colder Than Outer Space?

The vacuum of space is often considered the coldest place. The cosmic microwave background radiation keeps most of space at around 2.7 Kelvin.

But in the MIT lab:

  • They created a controlled environment with no radiation, no air, and extremely stable particles.

  • This allowed them to go far below natural space temperatures.

So yes — the MIT lab became colder than the universe itself.

🧠 Why Is This Important?

You might be wondering — why go through all this effort just to make something cold? Here's why it matters:

🔹 1. Understanding Quantum Mechanics

  • At near-absolute-zero temperatures, quantum effects dominate.

  • Atoms start to behave like waves, not particles.

  • Studying this can help scientists understand the quantum world better.

🔹 2. Advancing Quantum Computing

  • Quantum computers rely on delicate quantum states.

  • These states are more stable at ultracold temperatures.

  • Learning how to control particles at these temperatures could lead to faster, more powerful computers.

🔹 3. New Phases of Matter

  • At such low temperatures, new types of matter can appear, like:

    • Bose-Einstein Condensates (BEC)

    • Superfluids

  • These materials have zero resistance and unusual behaviors that defy normal physics.

🔹 4. Precision Measurements

  • At ultracold temperatures, particles move very slowly.

  • This makes it easier to make extremely precise measurements — helpful in fundamental physics, navigation systems, and sensors.

🔹 5. Simulating the Early Universe

  • Just after the Big Bang, the universe cooled rapidly.

  • These lab experiments can mimic early cosmic conditions — helping us understand how the universe evolved.

⚛️ Sodium-Potassium Molecules: The Real Stars

You may wonder — why use sodium-potassium molecules?

Here’s what makes them special:

  • They’re dipolar molecules — which means they have positive and negative ends, like tiny magnets.

  • They interact with each other in complex ways, perfect for studying quantum magnetism.

  • They’re also chemically stable and easy to cool.

MIT scientists created over 10,000 of these molecules, all sitting in a trap colder than any natural environment in the universe.

🧊 How Close Are We to Absolute Zero?

We’re incredibly close — but scientists can never reach exactly 0 Kelvin due to the Third Law of Thermodynamics, which states:

"As a system approaches absolute zero, the entropy (or disorder) approaches a minimum, but never becomes zero."

So while absolute zero is a theoretical limit, reaching picokelvin temperatures like this is the closest we’ve ever been.

🔭 How Does This Compare to Other Cold Records?

Let’s look at how this record stacks up:

Source Temperature
Deepest space (natural) ~2.7 K
Boomerang Nebula (coldest spot) ~1 K
Previous lab record ~100 picokelvin
MIT record (2025) 38 picokelvin ✅

🤔 Fun Fact: Cold = Slow Motion

At room temperature, atoms move at hundreds of meters per second.

At 38 picokelvin, their motion slows to less than a millimeter per second — that's like watching time freeze!

🚀 What’s Next in Ultracold Science?

MIT’s achievement is not the final frontier — it’s just the beginning.

Here’s what researchers aim to explore next:

  • Create new materials with zero resistance

  • Build more reliable quantum computers

  • Simulate black holes and wormholes in controlled environments

  • Study the mystery of dark matter through low-energy interactions

And maybe someday — we’ll discover a brand-new state of matter no one has seen before.

📚 Final Thoughts

The MIT experiment pushing the boundaries of temperature science is more than just a record — it's a glimpse into the future of quantum physics, computing, and our understanding of the universe.

In a tiny lab on Earth, scientists made a place colder than space itself, using only lasers, magnets, and brilliant minds. It's a powerful reminder of how far human curiosity can go — and how much colder things can get when we’re chasing the unknown.

🧊 TL;DR Summary

  • MIT scientists created the coldest temperature ever: 38 trillionths of a Kelvin above absolute zero.

  • They used ultracold sodium-potassium molecules cooled with lasers, magnets, and quantum tricks.

  • This lab setup is colder than outer space.

  • It opens doors to quantum computing, new states of matter, and precision science.

  • Absolute zero can never be reached, but this is the closest we’ve come.

Reference:“Ultracold dipolar gas of fermionic NaK molecules in their absolute ground state” https://dspace.mit.edu/handle/1721.1/97020

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