Kepler-296 e is a promising Earth-sized candidate located approximately 737 light-years away in the constellation Lyra. It belongs to a complex system with five confirmed planets orbiting a small red dwarf star.

Key Physical Characteristics

• Planet Type: Terrestrial (rocky) world.
• Size: It is very similar to Earth, with a radius about 1.5 times that of our planet.
• Orbit: It completes one orbit around its star every 34 Earth days.
• The Star: Kepler-296 is a red dwarf. While smaller than our Sun, it is part of a binary system (two stars), though the planets only orbit the primary star.

Habitability & Environment

In Lisa Kaltenegger’s research, Kepler-296 e is noted for its high “Earth-like” potential:

• Location: It sits comfortably within the Habitable Zone.
• Energy Intake: It receives about 1.4 times the starlight that Earth gets from the Sun. This puts it in a climate category similar to a “warm Earth” or a cooler version of Venus.
• Atmosphere: Because its size is slightly larger than Earth’s, it has the gravitational pull needed to hold onto a thick atmosphere, which is essential for maintaining surface liquid water and protecting against stellar radiation.

Scientific Significance

• Double Habitable System: Kepler-296 e is not alone; its sibling, Kepler-296 f, also orbits within the habitable zone further out. This “double-target” system allows scientists to study how two similar rocky worlds evolve differently under the same sun.
• Atmospheric Modeling: Kaltenegger uses planets like 296 e to test 3D climate models. Specifically, she studies whether high-altitude clouds could reflect enough starlight to keep a “warm” planet from overheating.
• Rocky Confirmation: Based on its size and mass estimates, it is highly likely to have a solid, rocky surface rather than being a gaseous “mini-Neptune.”

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Published @ March 24, 2026 9:35 am