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... of the British Interplanetary Society for Volume 52 52 '''Page ''' - 185-194 '''Year''' - 1999 '''Keywords''' - '''JBIS Reference Code ''' - 1999.52.185 '''Number of Pages''' - 10 Abstract The sources and evolution of the small-body population in the near-Earth environment are reviewed, and the broad consequences of small-body impact are considered in outline. Uncertainties in the impact rate are ...

... due to the relatively high frequency of such collisions. The material properties of small asteroids and comets significantly affect the outcome of both impact and planetary defence strategies that might be employed. The material properties of Earth-crossing objects are discussed in the current paper by comparison with those of meteorites and micrometeorites in order to identify a hazard scale for sub-critical impactors based on ...

... the amount of time it takes to get to space from Earth be the same, no matter where the launch sites are located? If you wanted to just 'get into space'—to an altitude of ... Earth (latitude) relative to the orbit location above Earth. This is because a launch site near the equator could reach an equatorial orbit—one that sits exactly above the equator—by launching along the ... over the poles, the rocket would have to travel north or southwards as well which would take more time and energy. Other factors such as safety— launches do not occur over populated ...

... of Pages''' - 12 Abstract The rate at which the surface of Earth is being cratered can be measured by analysing the sizes and ages of the craters that are found on certain stable areas of the Earth's land-mass. The effects of erosion can be easily accounted for. On the ...

... of orbits. Polar-orbiting spacecraft can generally observe the whole surface of the Earth over a series of orbits as the Earth spins underneath. Orbits in the equatorial plane require the least energy to achieve, because advantage can be taken of the Earth ... that will provide the space tourists of the future with the kind of experiences that they will demand for the price of their tickets into space. ''' Derek Webber About the Author ''' Extracted from the book ''Beyond Earth - The Future of Humans in ...

... the crew, myself included, has many emotions—some conflicting. We're always excited about being back on Earth, but the experiences just encountered on orbit—the success of the science experiments, the view of Earth and the heavens, the weightlessness, the realization that few others have experienced this&mdash ...

... SCIENTIFIC USES OF EARTH SATELLITES''' by Van Allen, J. A. (ed) ''Ann Arbor (Michigan), 1956: University of Michigan Press, 316 pages, $10.00'' An important contribution to artificial satellite literature, the book contains the 33 papers presented at the 1956 Upper Atmosphere Rocket Research Panel ...

... of educational facilities and services in space to accommodate the educational needs of children as well as adults. It is very likely that schools in space will look very different from those on Earth. ---- Answer provided by Ron Kohl Image:K2S logosmall.jpg Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

... dark side of the Moon. This is a term often used to refer to the far side of the Moon. The far side is always pointed away from the Earth because of the rotation period of the Moon matching that of Earth's. However it receives as much sunshine as the side of the Moon facing the Earth. ---- Answer ...

... horizontally at speeds of at least 17,500 miles per hour (mph) but remain under the influence of Earth's gravity. When the calculations are done correctly, there is a tug of war between the tendency to speed off in a straight line, and Earth's attraction, which results in pulling the ...

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