Science overview of the Europa Clipper mission

The goal of NASA’s Europa Clipper mission is to assess the habitability of Jupiter’s moon Europa. After entering Jupiter orbit in 2030, the flight system will collect science data while flying past Europa 49 times at typical closest approach distances of 25–100 km. The mission’s objectives are to investigate Europa’s interior (ice shell and ocean), composition, and geology; the mission will also search for and characterize any current activity including possible plumes. The science objectives will be accomplished with a payload consisting of remote sensing and in-situ instruments. Remote sensing investigations cover the ultraviolet, visible, near infrared, and thermal infrared wavelength ranges of the electromagnetic spectrum, as well as an ice-penetrating radar. In-situ investigations measure the magnetic field, dust grains, neutral gas, and plasma surrounding Europa. Gravity science will be achieved using the telecommunication system, and a radiation monitoring engineering subsystem will provide complementary science data. The flight system is designed to enable all science instruments to operate and gather data simultaneously. Mission planning and operations are guided by scientific requirements and observation strategies, while appropriate updates to the plan will be made tactically as the instruments and Europa are characterized and discoveries emerge. Following collection and validation, all science data will be archived in NASA’s Planetary Data System. Communication, data sharing, and publication policies promote visibility, collaboration, and mutual interdependence across the full Europa Clipper science team, to best achieve the interdisciplinary science necessary to understand Europa

The Enceladus Orbilander Mission Concept: Balancing Return and Resources in the Search for Life

Enceladus's long-lived plume of ice grains and water vapor makes accessing oceanic material readily achievable from orbit (around Saturn or Enceladus) and from the moon's surface. In preparation for the National Academies of Sciences, Engineering and Medicine 2023–2032 Planetary Science and Astrobiology Decadal Survey, we investigated four architectures capable of collecting and analyzing plume material from orbit and/or on the surface to address the most pressing questions at Enceladus: Is the subsurface ocean inhabited? Why, or why not? Trades specific to these four architectures were studied to allow an evaluation of the science return with respect to investment. The team found that Orbilander, a mission concept that would first orbit and then land on Enceladus, represented the best balance. Orbilander was thus studied at a higher fidelity, including a more detailed science operations plan during both orbital and landed phases, landing site characterization and selection analyses, and landing procedures. The Orbilander mission concept demonstrates that scientifically compelling but resource-conscious Flagship-class missions can be executed in the next decade to search for life at Enceladus

Uproar on Campus: Student Protests in the Vietnam War Era

The Vietnam War was one of the most polarizing events in United States history. Protesters angered by a decade of controversial policy decisions in Vietnam opposed what they believed to be an unfair and corrupt political system waging an unpopular war. As the antiwar movement began to gain momentum in the late 1960s and early 1970s, college students took leading roles, protesting not only against the war, but also against conventional forms of authority and social norms. Student protesters embraced a philosophy of free love, and peace and justice for all that had its roots in the radical counterculture movement that started in the early 1960s. The Vietnam War opened an ideological rift between Americans. The radical ideas of student protesters, and the antiwar movement more broadly, met opposition from the US government, as well as from supporters of the war. Americans on both side of this divide banded together to print and distribute materials across the country in the hopes of gaining support and recognition for their respective causes. The artifacts in this exhibit are drawn from the Radical Pamphlets Collection housed in Gettysburg College’s Musselman Library. These artifacts have been selected to provide a taste of what it might have been like to be a college student during the Vietnam War era

A systematic review of factors influencing fertility desires and intentions among people living with HIV/AIDS: implications for policy and service delivery

With availability of antiretroviral treatments, HIV is increasingly recognised as a chronic disease people live with for many years. This paper critically reviews the current literature on fertility desires and reproductive intentions among people living with HIV/AIDS (PLHIV) and critiques the theoretical frameworks and methodologies used. A systematic review was conducted using electronic databases: ISI Web of Knowledge, Science Direct, Proquest, Jstor and CINAHL for articles published between 1990 and 2008. The search terms used were fertility desire, pregnancy, HIV, reproductive decision making, reproductive intentions, motherhood, fatherhood and parenthood. Twenty-nine studies were reviewed. Fertility desires were influenced by a myriad of demographic, health, stigma-associated and psychosocial factors. Cultural factors were also important, particularly in Sub-Saharan Africa and Asia. Future research that examines fertility desires among PLHIV should include cultural beliefs and practices in the theoretical framework in order to provide a holistic understanding and to enable development of services that meet the reproductive needs of PLHIV

Women, motherhood, and living with HIV/AIDS : an introduction

This chapter sets the scene of this book. It provides a background understanding about women living with HIV/AIDS. It discusses salient issues concerning women who are mothers and the essence of having children as well as infant feeding practises. A gender lens perspective is also introduced as all chapters in the volume are argued to be situated within this approach. The chapter also introduces the book and it outlines details of all chapters which are included in the volume