ScienceGliese 581-d aka Goldilocks planet may not be habitable - the exoplanet may even be non-existent! Scientists at Pennsylvania State University found evidence disproving the existence of Goldilocks planets Gliese 581-d and Gliese 581-g. What were previously considered habitable, rocky planets, are most likely just sun spots on the host star.by Tina Shah
ScienceUltrasound helps astronomers determine age of stars by listening to their heartbeatsby Jim Algar