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By Shapley H.

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A similar orbit is achieved by Venus Express (launched in 2005), which overcomes the coverage problem by implementing several experiments with different spatial resolutions in the same spectral range. When there is an atmosphere, a very interesting strategy in terms of mass budget consists of progressively reducing the orbital velocity by dipping into the upper atmosphere, after capturing into a long-period-bound orbit with the main engine. 18. Insertion of Messenger into a polar orbit around Mercury, scheduled for 2009.

As shown in Fig. 2, each wavelength range provides specific information on the observed object. There is a link between the most useful wavelength range and the temperature of the observed object. High-energy ranges are most interesting for active objects, such as novae, supernovae, black holes or active galactic nuclei. “Cold” objects, such as molecular clouds and protostars are best observed in the IR. Furthermore, each wavelength range requires specific techniques, such as grazing incidence mirrors or coded masks for high-energy astronomy.

To atmospheric sciences and space plasma physics (ionized environment and interaction with the solar wind). g. an aeronomy mission, focussing on the ionosphere and environment, a mission focussing on the atmosphere and a surfaceoriented mission). As shown in Fig. 5, this sequence with four stages has been the general trend for all solar system objects apart from the Moon: the Apollo program had mainly political and strategic goals (such as closing the “missile gap” opened by the first Sputnik) and was only marginally (at least as far as the first missions were concerned) dedicated to science.

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Discovery of Eight Variable Stellar Spectra (1916)(en)(2s) by Shapley H.


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