Scientists Discover New Molten Liquid Planet Class

Scientists have identified a new category of exoplanets that exist in a permanent molten, liquid-like state. The discovery, based on observations from the James Webb Space Telescope, challenges traditional classifications of small planets. These worlds are neither rocky nor water-rich but instead consist of vast, global oceans of magma, offering fresh insights into planetary diversity beyond the solar system.

Discovery of a New Planetary Class

The newly identified class represents “liquid planets” that remain in a molten, mushy condition. Traditionally, small exoplanets were classified as rocky planets with thin atmospheres or water worlds with deep oceans. However, this finding introduces a third category—planets dominated by molten silicate material. The discovery was detailed in a recent study published in “Nature Astronomy”, highlighting the complexity of planetary evolution.

Key Features of L 98-59 d

The primary example of this class is L 98-59 d, located around 35 light-years from Earth. The planet is about 1.6 times larger and heavier than Earth. It has extremely high surface temperatures of nearly 1,900°C, resulting in a global magma ocean. Its mantle is composed of molten rock, and gravitational interactions with nearby planets generate massive waves across its lava surface.

Extreme Atmosphere and Conditions

L 98-59 d is surrounded by a dense atmosphere rich in hydrogen sulphide gas. This chemical composition would produce a strong odour similar to rotten eggs. The planet’s hostile environment makes it highly unlikely to support life. Its thick atmosphere traps heat efficiently, creating a runaway greenhouse effect that prevents cooling and maintains its molten state.

Important Facts for Exams

• L 98-59 d is located about 35 light-years away from Earth.
• It was observed using the James Webb Space Telescope.
• Hydrogen sulphide gas gives a characteristic rotten egg smell.
• Runaway greenhouse effect keeps the planet in a molten state.

Scientific Significance and Future Implications

This discovery suggests that many exoplanets previously considered habitable water worlds may actually be molten planets. Such planets act as natural laboratories to understand early Earth conditions, which was once molten billions of years ago. The finding expands the scope of planetary science and indicates that the diversity of worlds in the universe is far greater than previously assumed.