The Rosetta project scientist Matt Taylor speaks on the emotion of witnessing the end of the Rosetta spacecraft as it descended to the surface of Comet 67P/Churyumov-Gerasimenko and looks forward to the scientific bounty contained in the huge volume of data collected over the last two years.
Observations with ESO’s Very Large Telescope in Chile have discovered a new class of “dark” globular star clusters around the giant galaxy Centaurus A. These mysterious objects look similar to normal clusters, but contain much more mass and may either harbour unexpected amounts of dark matter, or contain massive black holes — neither of which was expected nor is understood.
The possibility that water and organic molecules were brought to the early Earth through cometary impacts has long been the subject of important debate. Now, ingredients crucial for the origin of life on Earth, including the simple amino acid glycine and phosphorus — key components of DNA and cell membranes — have been discovered at Comet 67P/Churyumov-Gerasimenko.
Comets are known to be a mixture of dust and ice, and if fully compact, they would be heavier than water. However, measurements have shown some of them to have densities much lower than that of water ice, implying that comets must be highly porous. A new study of low-density Comet 67P/Churyumov-Gerasimenko using data from ESA’s Rosetta spacecraft rules out a cavernous interior.