Nasa’s James Webb Space Telescope finds its first planet – and it is very similar to Earth


Nasa’s James Webb Space Telescope has found its first planet – and it appears to be very similar to Earth.

The planet is almost exactly the same size as our own world, and the precision of the JWST means that scientists can be very sure about their observations, they say.

It is expected to be just the beginning of a range of planets found by Nasa’s new space telescope. What’s more, it will be able to see those planets in much finer detail than ever before, as the only telescope that is able to characterise the atmosphere of distant planets.

For now, however, scientists have only been able to say what is not present in the planet’s atmosphere. It can’t have a thick methane-dominated atmosphere, for instance, akin to that on Titan, Saturn’s moon.

Researchers hope to be able to better characterise the distant planet’s atmosphere with time. But the findings also show JWST’s use in studying other planets – with many more discoveries expected to come in the following weeks and months.

“These first observational results from an Earth-sized, rocky planet open the door to many future possibilities for studying rocky planet atmospheres with Webb,” agreed Mark Clampin, Astrophysics Division director at Nasa Headquarters in Washington. “Webb is bringing us closer and closer to a new understanding of Earth-like worlds outside the Solar System, and the mission is only just getting started.”