Unmanned spacecraft missions

Polar Satellite Launch Vehicle (PSLV) For launching IRS/Sun-Synchronous Orbit (SSO) Satellites. India launched its first unmanned spacecraft under its mission Chandrayaan- to explore the moon on October 22, 2008 with the help of upgraded version of PSLV (also called PSLV-XL). 

The successes and failures of these unmanned spacecraft, along with the discoveries made possible by their successes, have set the parameters for the continuing discussion of the efficacy, expense, and likelihood of manned missions to Mars and eventual human colonization of the planet. 

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