While our solar system’s gas giants are far from the sun, the core of a gas giant is likely to be incredibly hot–Jupiter’s is estimated at around 43,000 degrees Fahrenheit.

A gas giant so close to a sun-like star would be classed as a "hot Jupiter" with an atmospheric temperature in the high hundreds, if not more than a thousand, degrees Celsius.

This allowed for the formation of the gas giants —Jupiter and Saturn—and the ice giants—Uranus and Neptune—which contain significant amounts of these ices and gases.

But an international team of astronomers have detected the unmistakable signature of a gas giant planet orbiting the undersized TOI-6894, according to a study in the journal Nature Astronomy.

The gas giant is about 11 times wider than Earth alone, with a diameter around its equator of 88,846 miles. And it's size is far from the only extreme feature that defines the fifth planet from ...

The gas giants outside our solar system are not capable of hosting extraterrestrial life, but do offer clues in a lingering mystery about how distant planets form, researchers said.

We did not expect planets like TOI-6894b to be able to form around stars this low-mass. This discovery will be a cornerstone for understanding the extremes of giant planet formation.” TOI-6894b is a ...

Most of the gas giants found by exoplanet hunters are hot Jupiters, massive gas giants with temperatures of ~1000-2000 Kelvin. TOI-6894b, by comparison, is just 420 Kelvin.

Long-period giant planets like TOI-4465 b can serve as a bridge between the extreme hot Jupiter exoplanets, which orbit very close to their stars, and the cold gas giants in our own solar system.

An artist's impression of a newly discovered giant planet named TOI-6894 b (top right) orbiting a red dwarf star (center) about 20% the mass of the sun, the image was released on June 4, 2025.

While our solar system’s gas giants are far from the sun, the core of a gas giant is likely to be incredibly hot–Jupiter’s is estimated at around 43,000 degrees Fahrenheit.