Mind-Blowing James Webb Telescope Discoveries (2025-2026) Explained for Kids

On Christmas morning in 2021, a rocket carrying the most expensive and most powerful telescope ever built lifted off from a launch pad in French Guiana. Inside the rocket was a giant gold mirror, folded up like origami, that would soon unfold a million and a half kilometres from Earth and start looking deeper into the universe than humans had ever seen before. Its name is the James Webb Space Telescope — JWST for short — and in just a few years it has rewritten parts of our science textbooks.

This guide explains what JWST actually is, why it sees infrared light instead of visible light, and the most amazing discoveries it has made so far — including the earliest galaxies ever spotted, the air around planets orbiting other stars, and brand-new views of planets right here in our own solar system.

What Is the James Webb Space Telescope?

JWST is a space telescope built by NASA, the European Space Agency (ESA), and the Canadian Space Agency (CSA). It launched on 25 December 2021 aboard an Ariane 5 rocket and is now stationed about 1.5 million kilometres from Earth — about four times farther than the Moon — at a special point in space called the Sun-Earth L2 Lagrange point. From there, the telescope orbits the Sun at exactly the same rate as Earth, which means it never has to look toward our Sun, Earth, or Moon, and can keep its instruments in deep, freezing darkness.

Webb's main mirror is 6.5 metres across and is made of 18 hexagonal segments coated in pure gold. Gold reflects infrared light incredibly well. The mirror is more than six times bigger by area than the Hubble Space Telescope's mirror, which is why Webb can see fainter, more distant objects.

To keep its instruments cold enough to detect faint infrared light — colder than minus 220 degrees Celsius — JWST has a five-layer sunshield the size of a tennis court. The sunshield blocks heat from the Sun, Earth, and Moon all at once. Without it, the telescope would glow from its own warmth and would not be able to see anything.

Why Infrared Light Is a Superpower

Human eyes see visible light — the rainbow of red through violet. But the universe also pours out invisible light at longer wavelengths called infrared. JWST is built to see exactly this kind of light, and that gives it three superpowers.

1. It sees through dust. Many of the most interesting places in space — stellar nurseries, the centres of galaxies, and the discs where planets are forming — are wrapped in thick clouds of dust. Visible light gets blocked by dust, but infrared sails right through.
2. It sees the ancient universe. Because the universe is expanding, light from extremely distant objects gets stretched. What started as ultraviolet or visible light gets stretched into infrared by the time it reaches us. So infrared is the only light that survives the journey from the very early universe.
3. It senses heat. Cool objects like exoplanets, brown dwarfs, and dust around stars glow most strongly in infrared. JWST can directly detect the warmth of these objects.

Discovery 1: The Earliest Galaxies Ever Seen

One of JWST's biggest missions was to look as far back in time as possible. Because light takes time to travel, looking at a far-away galaxy is the same as looking into the past. Light from a galaxy 13 billion light-years away has been travelling for 13 billion years before reaching us, so we see it as it was 13 billion years ago — back when the universe was very young.

In 2024, JWST confirmed a galaxy called JADES-GS-z14-0 as the most distant galaxy ever spectroscopically confirmed. Its light has been travelling for around 13.5 billion years, which means we are seeing it as it appeared roughly 290 million years after the Big Bang. That is when the universe was only about 2 percent of its current age. The galaxy is much brighter than anyone expected an object this old to be.

Even more surprisingly, JWST has been finding many other galaxies that look bigger, brighter, and more developed than scientists thought was possible so soon after the Big Bang. This has forced researchers to rethink how the first galaxies and stars formed. Some have called it the "impossibly early galaxy problem." There is still no full explanation — which makes it one of the most exciting open questions in astronomy right now.

Discovery 2: The Air Around Planets Orbiting Other Stars

Planets that orbit stars other than the Sun are called exoplanets. We now know of more than 5,800 of them. But until JWST, we had only blurry hints about what their atmospheres were made of. Webb changed that.

When a planet passes in front of its star, a tiny fraction of the star's light filters through the planet's atmosphere. Different gases absorb different colours of infrared light, leaving a kind of chemical fingerprint that JWST can read. This technique is called transmission spectroscopy.

Exoplanet	What JWST Found	Why It Matters
WASP-39 b	The first clear detection of carbon dioxide in an exoplanet atmosphere (2022), plus water, sulphur dioxide and sodium.	A huge first. Proved JWST could read exoplanet air clearly.
LHS 475 b	An Earth-sized rocky planet about 41 light-years away, with measurable atmospheric properties.	Showed JWST can study small, rocky worlds, not just giant gas planets.
K2-18 b	Detected methane and carbon dioxide. Possible signs of a molecule called dimethyl sulfide, which on Earth is only made by living things — but the detection is still being checked by other teams.	One of the most discussed exoplanet results of the decade. Even if dimethyl sulfide is not confirmed, it is the kind of measurement that could one day reveal life on another world.
TRAPPIST-1 b and c	Both planets appear to have little or no thick atmosphere, with daytime surface temperatures hot enough to melt some metals.	Helps narrow down which of the seven TRAPPIST-1 planets are most likely to be habitable. Outer planets in the system are still being studied.

Reading the air of a planet trillions of kilometres away is one of the most amazing things humans have ever managed to do. JWST is now methodically working through the atmospheres of dozens of small rocky planets to find out which ones might be Earth-like.

Discovery 3: The Pillars of Creation Like Never Before

The Pillars of Creation are towering columns of gas and dust inside the Eagle Nebula, about 6,500 light-years away. Hubble made them famous with a beautiful photograph in 1995. In October 2022, JWST took a new image of the same place — and the difference is breathtaking.

Webb's infrared eyes can see through much of the dust that Hubble could not. Inside the pillars, JWST revealed dozens of brand-new baby stars only a few hundred thousand years old, glowing in red and orange. The bright streaks of light coming off the pillars are jets shot out by the young stars as they form. Where Hubble showed us a beautiful structure, JWST showed us what is actually happening inside.

Discovery 4: Surprises in Our Own Solar System

JWST was designed to look at the most distant universe, but it can also turn its gaze closer to home. The results have been some of the most beautiful images ever taken of our neighbouring planets.

Jupiter

JWST captured Jupiter's faint dust rings — which most people do not even know Jupiter has — along with its powerful auroras at the poles and two of its small inner moons. The infrared view makes the Great Red Spot glow.

Saturn

In infrared, Saturn looks completely different from its usual gold colour. The planet itself appears dark while the ice particles in the rings glow brightly, since they reflect infrared sunlight very efficiently.

Uranus and Neptune

JWST has produced the clearest views of both ice giants since Voyager 2 flew past in the 1980s. It revealed all 13 of Uranus's known rings — including faint dusty ones we had only just discovered — and showed Neptune's rings with a clarity that astronomers had not seen for decades.

Mars

JWST took its first infrared images of Mars in 2022, mapping temperature differences between the day and night sides and detecting clear signatures of carbon dioxide in the planet's atmosphere.

Why These Discoveries Matter

JWST is not just collecting pretty pictures, even though many of its images are stunning enough to be framed as posters. Each discovery answers, or asks, a fundamental question.

• The earliest galaxies tell us how stars and galaxies first formed after the Big Bang, and how the universe lit up after a long "cosmic dark age."
• Exoplanet atmospheres help answer one of the oldest human questions: are we alone? Even if dimethyl sulfide on K2-18 b is not confirmed, JWST is teaching us how to look for life on planets light-years away.
• The new views of star nurseries like the Pillars of Creation reveal exactly how stars and planetary systems are born — including how our own Solar System once formed about 4.6 billion years ago.
• The solar system images are not just beautiful — they help scientists track weather, rings, and moons we cannot easily reach with spacecraft.

What Is Next for JWST?

JWST was originally designed to last about 10 years. But because the rocket placed it so precisely into orbit, it used far less fuel than expected during deployment. The mission can now realistically operate for at least 20 years — possibly into the 2040s. That means almost every kid reading this will grow up with JWST still sending back new discoveries.

Coming missions will use JWST to study the TRAPPIST-1 outer planets in detail, look for the smallest and faintest galaxies, peek through dust into the centres of nearby galaxies where supermassive black holes live, and follow up on any hints of habitable exoplanet atmospheres. Astronomers from more than 40 countries submit ideas for what JWST should look at next, and only the best proposals are chosen each year.

For thousands of years, every generation of humans has looked up at the sky and asked the same questions: How did everything begin? Are there other worlds? Are we alone? The James Webb Space Telescope is the latest, and most powerful, way humans have ever tried to answer them. And it has only just started.

For more on the worlds JWST is studying, see our parent's guide to teaching kids the solar system, and to learn about how the rockets that launch telescopes like Webb actually fly, read how rockets work for kids.