Scientists discover a gigantic exoplanet nine times the size of Jupiter still 'in the womb'

Scientists have observed an enormous planet about nine times the mass of Jupiter at a remarkably early stage of formation - describing it as still in the womb - in a discovery that challenges the current understanding of planetary formation.

The researchers used the Subaru Telescope located near the summit of an inactive Hawaiian volcano and the orbiting Hubble Space Telescope to detect and study the planet, a gas giant orbiting unusually far from its young host star.

Gas giants are planets, like our solar system's largest ones Jupiter and Saturn, composed mostly of hydrogen and helium, with swirling gases surrounding a smaller solid core.

"We think it is still very early on in its 'birthing' process," said astrophysicist Thayne Currie of the Subaru Telescope and the NASA-Ames Research Center, lead author of the study published on Monday in the journal Nature Astronomy.

"Evidence suggests that this is the earliest stage of formation ever observed for a gas giant".

It is embedded in an expansive disk of gas and dust, bearing the material that forms planets, that surrounds a star called AB Aurigae located 508 light years - the distance light travels in a year, 9.5 trillion km - from Earth.

This star got a fleeting moment of fame when its image appeared in a scene in the 2021 film 'Don't Look Up'.

About 5,000 planets beyond our solar system, or exoplanets, have been identified. This one, called AB Aur b, is among the largest. It is approaching the maximum size to be classified as a planet rather than a brown dwarf, a body intermediate between planet and star. It is heated by gas and dust falling into it.

Planets in the process of formation - called protoplanets - have been observed around only one other star.

Almost all known