Abstract
The discovery of a possible extrasolar planet that has the same mass as Earth and orbits α Centauri B, a member of the closest star system to the Sun, is both a technical achievement and cause for excitement. See Article p.207 An exoplanet with an Earth-like mass has been discovered orbiting the nearby star α Centauri B. The planet is not in the habitable zone — it is much nearer to its star than we are to the Sun, orbiting at only about 0.04 astronomical units from its star (an astronomical unit is the mean distance between Earth and the Sun). Statistical studies suggest that low-mass planets form preferentially in multi-planet systems, so it is possible that other planets are orbiting α Centauri B, perhaps in its habitable zone.
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