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Mars Telecommunications Orbiter
The Mars Telecommunications Orbiter (MTO) was a cancelled Mars mission that was originally intended to launch in 2009 and would have established an Interplanetary Internet between Earth and Mars.〔(End-to-End Information System Concept for the Mars Telecommunications Orbiter ); March, 2006. NASA JPL.〕〔(NASA To Test Laser Communications With Mars Spacecraft ); By Brian Berger, Space News, 25 May 2005.〕 The spacecraft would have arrived in a high orbit above Mars in 2010 and relayed data packets to Earth from a variety of Mars landers, rovers and orbiters for as long as ten years, at an extremely high data rate. Such a dedicated communications satellite was thought to be necessary due to the vast quantity of scientific information to be sent to Earth by such landers as the Mars Science Laboratory.
On July 21, 2005, it was announced that MTO had been canceled due to the need to support other short-term goals, including a Hubble servicing mission, Mars Exploration Rover extended mission operations, launch Mars Science Laboratory in 2009, and to prevent Earth science mission Glory from being cancelled.〔(Text of a Letter from the President to the Speaker of the House of Representatives July 15, 2005 | SpaceRef )〕
== Data transfer technology ==
The Mars Telecommunications Orbiter was a project to demonstrate laser communication in space (optical communications), instead of usual radiowaves. "Lasercom sends information using beams of light and optical elements, such as telescopes and optical amplifiers, rather than RF signals, amplifiers, and antennas."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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