[Report] Thermal and mechanical properties of the near-surface layers of comet 67P/Churyumov-Gerasimenko

Thermal and mechanical material properties determine comet evolution and even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface and Sub-Surface Science (MUPUS) instrument package gathered at the Philae landing site Abydos on comet 67P/Churyumov-Gerasimenko, we found the diurnal temperature to vary between 90 and 130 K. The surface emissivity was 0.97, and the local thermal inertia was 85 ± 35 J m−2 K−1s-1/2. The MUPUS thermal probe did not fully penetrate the near-surface layers, suggesting a local resistance of the ground to penetration of >4 megapascals, equivalent to >2 megapascal uniaxial compressive strength. A sintered near-surface microporous dust-ice layer with a porosity of 30 to 65% is consistent with the data. Authors: T. Spohn, J. Knollenberg, A. J. Ball, M. Banaszkiewicz, J. Benkhoff, M. Grott, J. Grygorczuk, C. Hüttig, A. Hagermann, G. Kargl, E. Kaufmann, N. Kömle, E. Kührt, K. J. Kossacki, W. Marczewski, I. Pelivan, R. Schrödter, K. Seiferlin

from Science: Current Issue
http://www.sciencemag.org/content/349/6247/aab0464.summary?rss=1

Comments

Post a Comment

Popular posts from this blog

Yu Founder On Next Flagship and Open Source Model for Upcoming Smartphones

Image
Micromax subsidiary Yu Televentures is gearing up to launch its next flagship smartphone this month. Ahead of the launch, company founder Rahul Sharma spoke to Gadgets 360 about the company's strategy for upcoming smartphones and the relationship with Cyanogen. He confirmed that the upcoming Yu flagship will run Android with some customisations from the company, and not Cyanogen , as seen on its predecessor. Sharma revealed that the company has so far sold 2 million devices since Yu established itself as an independent brand, with a new flagship smartphone expected to launch later this month. Talking about the upcoming smartphone, Sharma said that the company will be focusing on offering "pure Android experience" with a deep integration of Around Yu , a service aggregator platform that was introduced last year alongside the Yutopia flagship. He further hinted that the Around Yu will come with some new features. "When we got Cyanogen things were moving fine but
Read more

Vivo V3Max Review

Image
Now the number five smartphone vendor in the world , Vivo's growth has been nothing short of tremendous. This Chinese smartphone maker has come a long way since setting up shop in 2009, and has used its relatively premium positioning to develop a good reputation for itself in India. Vivo's newest launches are the V3 and V3Max , priced at Rs. 17,980 and Rs. 23,980 respectively. While the former is a simpler, more cost-effective phone, the latter offers a bit more in terms of performance and specifications. Today, we're reviewing the Vivo V3Max , which offers a mid-range feature set, but with a powerful new SoC under the hood. Find out all about the V3Max in our review. Look and feel The Vivo V3Max isn't a small phone by any means. With a 5.5-inch screen and weighing in at a chunky 168g, this phone is a proper phablet and not for anyone who wants a phone that is easy to handle. Although it is fairly slim for the size, the V3Max definitely has a sense of bulkiness to
Read more

Xiaomi Mi 5 in Pictures

Image
The Xiaomi Mi 5 sports a 5.15-inch 1080x1920 pixels display with curved 3D Ceramic glass, and a pixel density of 428ppi. The Mi 5 is powered by a Qualcomm Snapdragon 820 processor coupled with Adreno 530 GPU. The Mi 5 packs a 3000mAh battery and supports Qualcomm Quick Charge 3.0. The Mi 5 is the company's first to sport a physical home button that features an integrated fingerprint sensor. Mi 5 sports a 16-megapixel Sony IMX298 camera sensor with PDAF (phase detection autofocus) and LED flash. It uses phase detection autofocus and Deep Trench Isolation for faster focusing and more accurate colours. The Mi 5 sports a 4-Ultrapixel front camera, with 2-micron pixels. It bears an f/2.0 aperture lens. Xiaomi Mi 5 measures 144.5x69.2x7.25mm and weighs 129 grams. The dual-SIM (Nano + Nano) Xiaomi Mi 5 packs 32GB of internal storage that cannot be expanded. Variants with 64GB and 128GB of inbuilt storage are also available. Also onboard the Xiaomi Mi 5 is a USB Type-C port
Read more