TY - JOUR
AB - © 1970 Nature Publishing Group 494 NATURE VOL. 226 MAY 9 1970 SPACE RESEARCH the development of satellites equipped with small ion engines, capable of compensating for atmosphere drag Bene, Geophysical Satellites at altitudes of250 kilometres or thereabouts-according to the panel, this would be one of the most effective A CAREFUL study of the potential uses of geo­ ways of providing close orbit satellites which could physical satellites, carried out by a working group yield geodetic information more rapidly. under the joint chairmanship of Dr G. L. Pucillo of Further away, the panel argues for radar altimeters the NASA Electronics Research Center and Dr Stephen accurate to 10 centimetres, partly because instruments Madden of the MIT Measurement Systems Laboratory of such a kind could play an important part in defining has now been published (NASA CR-1579, Clearing the general circulation of the oceans. One of the House for Federal Scientific and Technical Information , practical problems here is that the theory of the $3). The document is an exceedingly thorough determination of the geopotential from satellite tracking examination of the benefits to be obtained from data is not fully understood-eventually it may be satellites orbiting the Earth at a 
TI - Shuttle Engine Started
JF - Nature
DO - 10.1038/226494b0
DA - 1970-05-09
UR - https://www.deepdyve.com/lp/springer-journals/shuttle-engine-started-7vrJZprKwz
SP - 494
EP - 494
VL - 226
IS - 5245
DP - DeepDyve
ER -