A rare nuclear reaction that occurs in red giants has been observed for the first time at the Gran Sasso National Laboratory in Italy. This result was achieved by the LUNA experiment, the world's only accelerator facility running deep underground.
Planets, stars, and galaxies form only the visible portion of the matter in the universe. Greater by far is the share accounted for by invisible "dark matter". Scientists have searched for the particles of dark matter in numerous experiments so far, without a definitive answer on its nature.
Buona parte del calore sprigionato dalle viscere della Terra deriva dal decadimento radioattivo dell’Uranio-238 e del Torio-232 presenti nel mantello, uno strato spesso 2000 km al di sotto della crosta.