Close Discovery

An Earth-sized world named LTT 1445 Ac, only 22 light-years away, orbits a small red dwarf star, making it the closest known Earth-sized world to our Solar System.

Trinary System

LTT 1445 Ac exists in a unique trinary star system. The planet orbits one of three gravitationally bound stars, affecting how scientists study its light.

Measurement Methods

Scientists use two methods to study exoplanets: transit data, showing the exoplanet's radius, and radial velocity data, indicating its mass.

Density Insights

The combined mass and radius data reveal the exoplanet's density, helping scientists deduce its composition, whether rocky like Earth or gaseous like giant planets.

Hubble's Role

NASA's Hubble Space Telescope accurately measured LTT 1445 Ac's size, confirming it as a rocky terrestrial planet with similar surface gravity to Earth.

Planetary System

The exoplanet is part of a complex system with an edge-on orbit, suggesting a co-planar alignment of all bodies in the system, including its star, LTT 1445A.

Atmospheric Potential

The possibility of characterizing LTT 1445 Ac's atmosphere through spectroscopy is significant for understanding terrestrial planets and their evolution.

Extreme Heat

Despite its Earth-like dimensions, LTT 1445 Ac has a surface temperature of about 500 degrees Fahrenheit, too hot for life as we know it.

Research Advances

This discovery showcases the capabilities of telescopes like Hubble and sets the stage for future studies with the James Webb Space Telescope.

Scientific Significance

LTT 1445 Ac's close resemblance to Earth in size and composition, despite its extreme temperature, makes it a valuable subject for studying planetary formation and the likelihood of life in the galaxy.