On May 26, 2004, a new version of the Planetarium of Rome was inaugurated at the Museum of Roman Civilization at Eur, more than twentyyears after the closure of the historic Planetarium that was housed in the Sala della Minerva. This great "machine of space and time" offers the public the opportunity to admire the sky, condensing over our heads centuries and light years. The 14-meter dome hides a perfect reproduction of the starry sky: the motions of the Sun, the Moon and the planets, the Zodiac, the Milky Way and 4500 stars. In addition, thanks to the three digital projectors, it is possible to make real three-dimensional explorations in the depths of space. The experience becomes even more immersive thanks to all-sky simulations and projections of celestial bodies, nebulae and galaxies. The Planetarium of Rome presents a rich program of live astronomical shows, conferences, events and astronomical observations, aimed at all those who wish to get closer to the wonders of the sky and know its secrets. In addition, adjacent to the planetarium, it is possible to visit an astronomical museum that leads the visitor on a journey from Earth to the universe, through great themes such as space, time, origin of the elements, presenting models of the planets, dioramas and interactive multimedia stations. Reopening a window on the sky is therefore now possible: the Planetarium of Rome is an astronomical theater in which to reappropriate the spectacle of the starry vault and launch into the depths of space, discovering the universe that surrounds us.