... Per la m ta finale potrebbe essere un'orbita pi alta, la Luna, un pianeta o una cometa, o addirittura un oggetto al di fuori del Sistema Solare. ... di una vela solare. ... In generale, ci si aspetta che le vele solari siano utilizzabili dove la luce solare sufficientemente intensa, per esempio all'interno dell'orbita di Marte. Tuttavia Robert Forward, scrittore di fantascienza e fisico, ha proposto l'uso di una vela solare per i viaggi verso le stelle lontane. ... Buchi nelle vele solari . ...

The SHARP cannon. Hydrogen is compressed . in the tube on top, the gun barrel is on bottom. ... Suppose the barrel of the cannon is a mile long ( @ 1600 meter) and the final velocity v , the one with which the shell emerges, is the escape velocity from the surface of the Earth . ... However, inert payloads (water, food, rocket fuel etc. ) could in principle be sent into space using a huge "super-cannon. ... Next Regular Stop: #31 Far-out Pathways to Space: Nuclear Power . ...

... Views of the Valles and Other Calderas . ... Caldera in the Spanish language means "kettle" or "cauldron"; in geological literature, it has come to be known as a volcanic collapse crater. ... Large calderas are usually formed during a collapse that truncates an entire volcanic field, not just one large cone. The Valles caldera of New Mexico is a beautiful example of a resurgent caldera located in the midst of the Jemez volcanic field. ... Landsat Image of the Valles Caldera . ...