This early morning view of the inner wall of Gale Crater is ethereal. (credit: NASA)
People like Elon Musk and others in the "space settlement" camp believe NASA and the US space industry should colonize Mars and make homo sapiens a multi-planet species. Musk wants SpaceX to one day send colonists to Mars, while NASA is talking...
Lawyers for Gravity Payments CEO Dan Price and his brother and business partner, Lucas Price, squared off in court Friday...
Gravimeters have applications ranging from oil exploration to the detection of underground tunnels, but size and lack of portability have limited their field use. A device the size of a postage stamp promises fresh opportunities. See Letter p.614
Nature 531 585 doi: 10.1038/531585a
Cometary nuclei consist mostly of dust and water ice. Previous observations have found nuclei to be low-density and highly porous bodies, but have only moderately constrained the range of allowed densities because of the measurement uncertainties. Here we report the precise mass, bulk density, porosity and internal structure of the nucleus of comet 67P/Churyumov–Gerasimenko on the basis of its gravity field. The mass and...
