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The Philae lander reveals low-strength primitive ice inside cometary boulders
Parker, Joel Wm.; Auster, Hans-Ulrich; Heinisch, Philip +25 more
On 12 November 2014, the Philae lander descended towards comet 67P/Churyumov-Gerasimenko, bounced twice off the surface, then arrived under an overhanging cliff in the Abydos region. The landing process provided insights into the properties of a cometary nucleus1-3. Here we report an investigation of the previously undiscovered site of …
Spectroscopic confirmation of a mature galaxy cluster at a redshift of 2
Brammer, G.; Stanford, S. A.; Allen, S. W. +6 more
Galaxy clusters are the most massive virialized structures in the Universe and are formed through the gravitational accretion of matter over cosmic time1. The discovery2 of an evolved galaxy cluster at redshift z = 2, corresponding to a look-back time of 10.4 billion years, provides an opportunity to study its properties. The…
An orbital water-ice cycle on comet 67P from colour changes
Longobardo, Andrea; Mottola, Stefano; Arnold, Gabriele +10 more
Solar heating of a cometary surface provides the energy necessary to sustain gaseous activity, through which dust is removed1,2. In this dynamical environment, both the coma3,4 and the nucleus5,6 evolve during the orbit, changing their physical and compositional properties. The environment around an active nucleus …
Reply to: On the signature of a 70-solar-mass black hole in LB-1
Soria, Roberto; Liu, Jifeng; Lu, Youjun +4 more
Eye of a skull reveals details of cometary materials
Asphaug, Erik
The Philae spacecraft was meant to anchor itself to the surface of the comet 67P/Churyumov-Gerasimenko, but instead bounced into a hidden grotto. The telltale markings of its passage reveal details of the comet's fragile boulders.