Scientists in the US have discovered the closest Earth-sized exoplanet, named LTT 1445 Ac, located just 22 light-years away.
Although too hot for life, LTT 1445 Ac's Earth-like features make it valuable for studying planetary evolution and understanding the differences between Earth-like worlds.
The exoplanet was identified using data from the TESS exoplanet-hunting telescope in 2021, but observational challenges initially left uncertainties about its properties.
LTT 1445 Ac orbits one of three stars in a trinary system, posing challenges for observation due to the gravitational effects of stellar companions on light.
Low density suggests a gas giant with a diminished atmosphere, while higher density indicates a rocky composition similar to Earth, Venus, Mars, or Mercury.