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Have you ever wondered what the inside of a planet might look like? Well, it looks like scientists have moved one step closer to finding out!

Researchers have come across the core of a planet orbiting a distant star in space. The find has given astronomers the chance to examine a planet's innermost layers.

The planetary core, which is officially known as TOI 849 b, was found by Nasa's planet-hunting spacecraft, Tess.

It's about 730 light years away from the Earth and is roughly the same size as the planet Neptune, although it's thought to be around two to three times heavier. Scientists believe it's mainly made out of iron, rock and water.

Researchers were able to work out the size of TOI 849 b by examining the amount of light the planetary core blocked as it passed in front of the star it orbits. They also found that the planetary core takes about 18 hours to orbit its host star.

Scientists aren't 100% sure how TOI 849 b came to be, but there are a few different theories.

They believe the planetary core may have been a gas giant like Jupiter which lost most of its outer gas either because of a collision with another planet, or because of something known as a tidal disruption. This is when a planet gets too close to a supermassive black hole and the hole's tidal force rips the planet apart.

Another theory is that the star is a "failed" gas giant which never formed an atmosphere.

The new finding have been welcomed by researchers who believe it could provide an opportunity for them to study the inside of a planet and how it's structured.

"This is the first time that we've discovered an intact exposed core of a gas giant around a star," said Dr David Armstrong who is the lead author on the study. "We have the opportunity to look at the core of a planet in a way that we can't do in our own solar system.

"There are still big open questions about the nature of Jupiter's core, for example, so strange and unusual exoplanets like this give us a window into planet formation that we have no other way to explore."