Follow the tender notice in SAP Ariba: http://discovery.ariba.com/rfx/11583878***This bid solicitation cancels and supersedes previous bid solicitation number WS3030901839 dated 2021/07/09 with a closing of 2021/09/09 at 2p.m. EDT. A debriefing or feedback session will be provided upon request to bidders/offerors/suppliers who bid on the previous solicitation.***AMENDMENT TO CLOSING TIME: Please disregard the Ariba Discovery posting response deadline closing time and Buyandsell posting closing time. All required supporting documentation and bid submission must be submitted before November 26, 2021, by 2 p.m. EST. All bids submitted after November 26, 2021, 2 p.m. EST will result in the bid being declared non-responsive. TITLE: CASTOR Mission Phase 0 Public Works and Government Services Canada (PWGSC), on behalf of the Canadian Space Agency (CSA) located in ST-Hubert (Quebec), is releasing this Request for Proposal (RFP) to acquire services to conduct work for the CASTOR Mission Phase 0.***CASTOR (Cosmological Advanced Survey Telescope for Optical and UV Research) is a 1-meter class space telescope concept on a small satellite platform that would make a unique contribution to astrophysics by providing a wide field, high-resolution imaging in the UV/optical spectral region, surpassing any ground-based optical telescope in image sharpness.