A future telescope that could find alien life on distant planets

Are we alone in space? It may be the biggest question of all. Now NASA is building a plan to answer it. A giant new telescope will hunt for alien life on planets around other stars.

Its name is the Habitable Worlds Observatory. That is a long name. "Habitable" just means a place where living things could live. Many people call it HWO for short.

A telescope with one big job

Most space telescopes do many jobs. This one has a special one. It is the first telescope made mainly to look for life.

Top scientists in the USA picked it as their most important big space mission. That is how much they want to answer this question.

NASA wants it to take pictures of about 25 planets. These planets will be a lot like Earth. They will go around stars a lot like our Sun.

Why stars like the Sun? Because we know life grew on a planet going around one. So it is a smart place to start looking.

It will be huge. Its main mirror will be at least 6 metres wide. That is wider than a car is long. A bigger mirror catches more light. More light means sharper views.

The firefly problem

Here is the hard part. Stars are bright. Planets are dim. Very dim.

A star can be about 10 billion times brighter than a planet like Earth. Seeing that planet is like spotting a firefly next to a lighthouse.

This telescope will have a special tool inside, like a tiny shade. It helps block the star's light, so we can see the dim planet beside it.

To do this, the telescope must stay very, very still. NASA says its parts must not move more than the width of an atom. That is how still it must be.

Reading a planet's light

The telescope will not see walking aliens. It will study each planet's light. That light will reveal which gases are on the planet.

Light can be split into a rainbow. Gases in a planet's air leave dark lines in that rainbow. Each gas leaves its own lines. Like a fingerprint.

Some gases are made by living things. On Earth, plants make oxygen. Tiny living things make methane. If the telescope finds these gases together, it could mean that planet has life.

But water is not enough. A new study made a pretend Earth with no life. It still kept its seas. So the telescope must look for more than water. It must look for the gases that living things make on Earth.

When will it fly?

Not soon. It is expected to go to space in the 2040s. NASA is still working on the plans.

In January 2026, NASA picked seven companies to help build its new parts. Other countries are helping too. The UK has given £1 million to help with its design.

It will come after NASA's Roman Space Telescope, which goes up first. HWO will also learn from Hubble and Webb, NASA's famous space telescopes.

And here is a clever idea. HWO will be built so it can be fixed in space. If a part breaks or gets old, it can be swapped. That could help it work for many years.

HWO will not only hunt for life. It will also study the planets in our own Solar System. And it will look at faraway galaxies to learn how they grow.

Are we alone?

We already know some exciting planets. One is GJ 3378 b. It sits near the edge of where life could exist. Telescopes like HWO could tell us much more about worlds like these.

Finding life will not be quick or easy. One clue alone will not prove it. Scientists will need many clues that fit together.

But for the first time, we are building a tool made for this job. One day, it may show us a planet that is truly alive. And that would change everything.