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"Space Exploration and Astronautics"
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The politics and perils of space exploration : who will compete, who will dominate?
\"Written by a former Aerodynamics Officer on the space shuttle program, this book provides a complete overview of the 'new' U.S. space program, which has changed considerably over the past 50 years. The future of space exploration has become increasingly dependent on other countries and private enterprise. Can private enterprise fill the shoes of NASA and provide the same expertise and safety measures and lessons learned from NASA? In order to tell this story, it is important to understand the politics of space as well as the dangers, why it is so difficult to explore and utilize the resources of space. Some past and recent triumphs and failures will be discussed, pointing the way to a successful space policy that includes taking risks but also learning how to mitigate them\"--Provided by publisher.
Book
The Solar Probe Plus Mission: Humanity’s First Visit to Our Star
Solar Probe Plus (SPP) will be the first spacecraft to fly into the low solar corona. SPP’s main science goal is to determine the structure and dynamics of the Sun’s coronal magnetic field, understand how the solar corona and wind are heated and accelerated, and determine what processes accelerate energetic particles. Understanding these fundamental phenomena has been a top-priority science goal for over five decades, dating back to the 1958 Simpson Committee Report. The scale and concept of such a mission has been revised at intervals since that time, yet the core has always been a close encounter with the Sun. The mission design and the technology and engineering developments enable SPP to meet its science objectives to: (1) Trace the flow of energy that heats and accelerates the solar corona and solar wind; (2) Determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar wind; and (3) Explore mechanisms that accelerate and transport energetic particles. The SPP mission was confirmed in March 2014 and is under development as a part of NASA’s Living with a Star (LWS) Program. SPP is scheduled for launch in mid-2018, and will perform 24 orbits over a 7-year nominal mission duration. Seven Venus gravity assists gradually reduce SPP’s perihelion from 35 solar radii (
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) for the first orbit to
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for the final three orbits. In this paper we present the science, mission concept and the baseline vehicle for SPP, and examine how the mission will address the key science questions
Journal Article
Optical-Ultraviolet Tidal Disruption Events
The existence of optical-ultraviolet Tidal Disruption Events (TDEs) could be considered surprising because their electromagnetic output was originally predicted to be dominated by X-ray emission from an accretion disk. Yet over the last decade, the growth of optical transient surveys has led to the identification of a new class of optical transients occurring exclusively in galaxy centers, many of which are considered to be TDEs. Here we review the observed properties of these events, identified based on a shared set of both photometric and spectroscopic properties. We present a homogeneous analysis of 33 sources that we classify as robust TDEs, and which we divide into classes. The criteria used here to classify TDEs will possibly get updated as new samples are collected and potential additional diversity of TDEs is revealed. We also summarize current measurements of the optical-ultraviolet TDE rate, as well as the mass function and luminosity function. Many open questions exist regarding the current sample of events. We anticipate that the search for answers will unlock new insights in a variety of fields, from accretion physics to galaxy evolution.
Journal Article
Spacefarers : how humans will settle the Moon, Mars, and beyond
\"More than fifty years after the Apollo 11 moon landing, why is there so little human presence in space? Will we ever reach Mars? What will it take to become a multiplanet species, colonizing the solar system and traveling to other stars? Spacefarers meets these questions head on. While many books have speculated on the possibility of living beyond the Earth, few have delved into the practical challenges or plausible motives for leaving the safe confines of our home planet. Christopher Wanjek argues that there is little doubt we will be returning to the Moon and exploring Mars in the coming decades, given the potential scientific and commercial bonanza. Private industry is already taking a leading role and earning profits from human space activity. This can be, Wanjek suggests, a sustainable venture and a natural extension of earthbound science, business, and leisure. He envisions hoteling in low-earth orbit and mining, tourism, and science on the Moon. He also proposes the slow, steady development of science bases on Mars, to be followed by settlements if Martian gravity will permit reproduction and healthy child development. An appetite for wonder will take us far, but if we really want to settle new worlds, we'll need the earnest plans of engineers, scientists, and entrepreneurs. Wanjek introduces us to those planners, who are striving right now to make life in space a reality\"-- Provided by publisher.
BOOK
Radio Properties of Tidal Disruption Events
Radio observations of tidal disruption events (TDEs) probe material ejected by the disruption of stars by supermassive black holes (SMBHs), uniquely tracing the formation and evolution of jets and outflows, revealing details of the disruption hydrodynamics, and illuminating the environments around previously-dormant SMBHs. To date, observations reveal a surprisingly diverse population. A small fraction of TDEs (at most a few percent) have been observed to produce radio-luminous mildly relativistic jets. The remainder of the population are radio quiet, producing less luminous jets, non-relativistic outflows or, possibly, no radio emission at all. Here, we review the radio observations that have been made of TDEs to date and discuss possible explanations for their properties, focusing on detected sources and, in particular, on the two best-studied events: Sw J1644+57 and ASASSN-14li. We also discuss what we have learned about the host galaxies of TDEs from radio observations and review constraints on the rates of bright and faint radio outflows in TDEs. Upcoming X-ray, optical, near-IR, and radio surveys will greatly expand the sample of TDEs, and technological advances open the exciting possibility of discovering a sample of TDEs in the radio band unbiased by host galaxy extinction.
Journal Article
Star bound : a beginner's guide to the American space program, from Goddard's rockets to Goldilocks planets and everything in between
\"Star Bound is a book for anyone who wants to learn about the American space program but isn't sure where to start. First and foremost, it's a history-short, sweet, and straightforward. From rocketry pioneer Robert Goddard's primitive flight tests in 1926 through the creation of NASA, from our first steps on the moon to construction of the International Space Station and planning a trip to Mars, readers will meet the people and projects that have put the United States at the forefront of space exploration. Along the way, they'll learn: How the United States beat the Soviets to the moon Why astronauts float in space (Hint: It's not for lack of gravity!) How fast rockets have to go to stay in orbit around Earth How we can \"look back in time\" through a space telescope With technology evolving and humanity's understanding of the universe expanding, we are entering an exciting period of space exploration. Authored by two veteran space writers with unique insights into the topic, Star Bound offers up the story of Americans in space with a focus on the cultural and societal contexts of the country's most important missions rather than engineering and technical minutiae. Vibrant, positive, and humorous, Star Bound is packed with facts and stories for novice space fans. And sprinkled in with the history are lists of the greatest space songs, books, movies, and more-all designed to make space exploration accessible to even the casual reader\"-- Provided by publisher.
BOOK
The Juno Mission
Juno is a PI-led mission to Jupiter, the second mission in NASA’s New Frontiers Program. The 3625-kg spacecraft spins at 2 rpm and is powered by three 9-meter-long solar arrays that provide ∼500 watts in orbit about Jupiter. Juno carries eight science instruments that perform nine science investigations (radio science utilizes the communications antenna). Juno’s science objectives target Jupiter’s origin, interior, and atmosphere, and include an investigation of Jupiter’s polar magnetosphere and luminous aurora.
Journal Article
Reaching for the moon : a short history of the space race
At the dawn of the space age, technological breakthroughs in Earth orbit flight were both breathtaking feats of ingenuity and disturbances to a delicate global balance of power. In this short book, aerospace historian Roger D. Launius concisely and engagingly explores the driving force of this era: the race to the Moon. Beginning with the launch of Sputnik 1 in October 1957 and closing with the end of the Apollo program in 1972, Launius examines how early space exploration blurred the lines between military and civilian activities, and how key actions led to space firsts as well as crushing failures. Launius places American and Soviet programs on equal footing-following American aerospace engineers Wernher von Braun and Robert Gilruth, their Soviet counterparts Sergei Korolev and Valentin Glushko, and astronaut Buzz Aldrin and cosmonaut Alexei Leonov-to highlight key actions that led to various successes, failures, and ultimately the American Moon landing.
Book
Relative Atomic Solar System Abundances, Mass Fractions, and Atomic Masses of the Elements and Their Isotopes, Composition of the Solar Photosphere, and Compositions of the Major Chondritic Meteorite Groups
This brief special communications article gives data for atomic abundances and mass fractions for the elemental and isotopic solar system composition, the atomic masses of the elements and their isotopes, the composition of the solar photosphere, and the compositions of the major chondritic meteorite groups. This additional material is relevant for researchers who are interested in this Topical Collection on planetary evolution.
Journal Article