Ceres: Its Origin, Evolution and Structure and Dawn��s Potential Contribution

Ceres appears likely to be differentiated and to have experienced planetary evolution processes. This conclusion is based on current geophysical observations and thermodynamic modeling of Ceres?? evolution. This makes Ceres similar to a small planet, and in fact it is thought to represent a class of objects from which the inner planets formed. Verification of Ceres?? state and understanding of the many steps in achieving it remains a major goal. The Dawn spacecraft and its instrument package are on a mission to observe Ceres from orbit. Observations and potential results are suggested here, based on number of science questions.     

鸡尾酒戒 绽放春夏“醉人”诱惑

如何在明星扎堆的晚宴上脱颖而出,吸引人们的注意?如何身着枯燥单调的职业装,点亮办公室人们的眼球?如何在大街上密集的人群中,闪现你的卓尔不凡?春夏时节,且看鸡尾酒戒绚丽登场。     

Space solar array reliability: A study and recommendations

Providing reliable power over the anticipated mission life is critical to all satellites; therefore solar arrays are one of the most vital links to satellite mission success. Furthermore, solar arrays are exposed to the harshest environment of virtually any satellite component. In the past 10 years 117 satellite solar array anomalies have been recorded with 12 resulting in total satellite failure. Through an in-depth analysis of satellite anomalies listed in the Airclaim's Ascend SpaceTrak database, it is clear that solar array reliability is a serious, industry-wide issue. Solar array reliability directly affects the cost of future satellites through increased insurance premiums and a lack of confidence by investors. Recommendations for improving reliability through careful ground testing, standardization of testing procedures such as the emerging AIAA standards, and data sharing across the industry will be discussed. The benefits of creating a certified module and array testing facility that would certify in-space reliability will also be briefly examined. Solar array reliability is an issue that must be addressed to both reduce costs and ensure continued viability of the commercial and government assets on orbit.     

Taking a common-pool resources approach to space sustainability: A framework and potential policies

This paper examines Nobel Prize Winner Elinor Ostrom's principles for sustainable governance of common-pool resources (CPR), capturing the best practices of CPRs over the years, which avoid the “Tragedy of the Commons” without being either completely privatized or controlled by a Leviathan entity. Ostrom's principles highlight, inter alia, the need for clear boundary definitions, rules tailored to fit the domain, who has a say in formulation of collective-choice agreements and operational rules, monitoring of behavior, graduated penalties, and conflict resolution mechanisms. In the context of the space domain they highlight issues such as the definition of where space begins, gaps in the existing liability regime, the concept of collaborative space situational awareness, and how best to include emerging and developing space actors in negotiations and decision making. The paper concludes that Ostrom's principles highlight specific areas on which to focus initial space sustainability efforts and national and international policy. It also recommends further analysis into how best to translate her principles to the space domain, where they may not be wholly applicable because of the unique nature of space, and how to evolve space governance institutions and mechanisms to best suit the unique environment of outer space.     

Threats, risks, and sustainability—Answers from space: Results of the ESPI conference

An initiative was undertaken by the European Space Policy Institute (ESPI) on 10–11 December 2007 to shed new light on the various threats to long-term sustainability on Earth using an interdisciplinary approach. The main objective of this conference was to analyse how space could be a tool for prediction, management or mitigation of threats and risks in six sectors (environment, security, mobility, knowledge, resources and energy) defined by ESPI as the main areas for sustainability. For each sector, one (non-space) speaker from a think-tank covering the respective sector and two speakers from the space sector exchanged views and ideas in order to identify common needs for action to ensure sustainability in the field. Such a dialogue between sector specialist and space experts permitted a detailed examination of the way space has become a crucial tool in solving a variety of today's problems. It also identified areas where space applications could better respond to sectoral and future challenges.     

SDI versus arms control

Dr Dahlitz examines three options for the strategic relationship between the superpowers and scrutinizes 12 major arguments that have been advanced in favour of the Strategic Defense Initiative. Arms control is offered as an available option and recommendation are given for methods of outer space arms control. These considerations are brought together in an illustrative draft Treaty on the Prohibition of the Use of Force Concerning Outer Space.     

Humans to Mars: a feasibility and cost-benefit analysis

Mars is a compelling astrobiological target, and a human mission would provide an opportunity to collect immense amounts of scientific data. Exploration alone, however, cannot justify the increased risk. Instead, three factors drive a human mission: economics, education, and exploration. A human mission has a unique potential to inspire the next generation of young people to enter critically needed science and engineering disciplines. A mission is economically feasible, and the research and development program put in place for a human mission would propel growth in related high-technology industries. The main hurdles are human physiological responses to 1–2 years of radiation and microgravity exposure. However, enabling technologies are sufficiently mature in these areas that they can be developed within a few decade timescale. Hence, the decision of whether or not to undertake a human mission to Mars is a political decision, and thus, educational and economic benefits are the crucial factors.     

Impact disruption and recovery of the deep subsurface biosphere

Although a large fraction of the world's biomass resides in the subsurface, there has been no study of the effects of catastrophic disturbance on the deep biosphere and the rate of its subsequent recovery. We carried out an investigation of the microbiology of a 1.76 km drill core obtained from the ～35 million-year-old Chesapeake Bay impact structure, USA, with robust contamination control. Microbial enumerations displayed a logarithmic downward decline, but the different gradient, when compared to previously studied sites, and the scatter of the data are consistent with a microbiota influenced by the geological disturbances caused by the impact. Microbial abundance is low in buried crater-fill, ocean-resurge, and avalanche deposits despite the presence of redox couples for growth. Coupled with the low hydraulic conductivity, the data suggest the microbial community has not yet recovered from the impact ～35 million years ago. Microbial enumerations, molecular analysis of microbial enrichment cultures, and geochemical analysis showed recolonization of a deep region of impact-fractured rock that was heated to above the upper temperature limit for life at the time of impact. These results show how, by fracturing subsurface rocks, impacts can extend the depth of the biosphere. This phenomenon would have provided deep refugia for life on the more heavily bombarded early Earth, and it shows that the deeply fractured regions of impact craters are promising targets to study the past and present habitability of Mars.     

A language for arms control in space

Although precise terminology has been invented for all kinds of weapons and battle theories, the language used for arms control remains vague. Precise definitions and demarcations for arms control concepts and regions of outer space can make disarmament discussions more specific and thus more productive. Thie viewpoint puts forward a proposed terminology, in the hope that it will increase the prospects for control of space weapons.