
Astronomers have discovered a planet orbiting the closest solo star to the solar system, known as Barnard's star. The newly discovered exoplanet has around half the mass of Venus, which classifies it as a "sub-Earth."

Astronomers have discovered a planet orbiting the closest solo star to the solar system, known as Barnard's star. The newly discovered exoplanet has around half the mass of Venus, which classifies it as a "sub-Earth."