Key Points
A team of astronomers has discovered a planet closer and younger than any other Earth-sized world yet identified...
The planet is known as HD 63433d and it's the third planet found in orbit around a star called HD 63433...
HD 63433d is so close to its star, it completes a trip all the way around every 4.2 days..
Even though it's really close-orbiting, we can use follow-up data to search for evidence of outgassing and atmospheric loss that could be important constraints on how terrestrial worlds evolve, she added...
In 2020, they used data from NASA's Transiting Exoplanet Survey Satellite to identify two mini-Neptune-sized planets orbiting HD 63433...
