Is the universe the greatest mystery of all? Analysis of a planet 205 trillion miles from Earth has shown it to be different from every other kind that we know about.
Astronomers find ‘hellish’ lava planet
Sulphurous surprise: Astronomers once thought planet L98-59d was a watery paradise, but new data reveals a hellish world of magma oceans and the stench of rotten eggs. Glossary
Light years - A unit of measurement equal to the distance that light travels in one year, which is 9.4607 times 1012 km. That's nearly 6 million million miles!
James Webb Space Telescope - A high resolution space telescope that overtook the capabilities of the Hubble telescope. It was launched in December 2021.
Hydrogen Sulphide - A colourless gas that smells like rotten eggs. It is often produced by bacteria breaking down organic matter and can be poisonous in high concentrations.
Mantle - The layer between the Earth’s outer core and the crust. The semi-solid layer of rock is made mostly out of iron, magnesium and silicon.
Lava - Hot, molten (liquid) rock that has broken through the Earth's surface, usually during a volcanic eruption. Once it cools down, it hardens into solid rock.