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| telescope_name = CaSSIS | telescope_type = Three-mirror anastigmat | telescope_diameter = | telescope_focal_length= | telescope_wavelength = from 0.475 µm (blue) to 0.95 µm (near-infrared) | telescope_resolution = | instruments = | programme = ExoMars | next_mission = ExoMars rover | insignia = | insignia_caption = | insignia_alt = | insignia_size = }} The ExoMars Trace Gas Orbiter (TGO) is a collaborative project between the European Space Agency (ESA) and the Russian Federal Space Agency (Roscosmos) to send an atmosphere research orbiter and demonstration lander to Mars in 2016 as part of the larger European-led ExoMars mission.〔(MEPAG Report to the Planetary Science Subcommittee ) Author: Jack Mustard, MEPAG Chair. July 9, 2009 (pp. 3)〕 The mission will follow with a lander and Mars Rover in 2018 in which the 2016 launched TGO spacecraft will also operate as a communication link with earth and the rover. In October 2016 the trace gas orbiter will deliver the ExoMars EDM Schiaparelli lander and then proceed with atmospheric mapping. A key goal of this mission is to gain a better understanding of methane and other atmospheric gases present in the Martian atmosphere that could be evidence for possible biological or geological activity. This research will also be used to help select the landing site for the 2018 ExoMars rover which will include multiple life searching instruments. == History == Investigations with space and Earth-based observatories have demonstrated the presence of small amounts of methane on the atmosphere of Mars that has been shown to vary with location and time.〔(Mars Trace Gas Mission ) (September 10, 2009)〕 This may indicate the presence of life on Mars, but may also be produced by a geochemical process, volcanic or hydrothermal activity.〔(Making Sense of Mars Methane (June 2008) )〕 The challenge to discern the source of methane in the atmosphere of Mars prompted the independent planning of two orbiters that would carry instruments in order to determine if its formation is of biological or geological origin, as well as its decomposition products such as formaldehyde and methanol. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ExoMars Trace Gas Orbiter」の詳細全文を読む スポンサード リンク
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