Space Science Missions in Development
The missions below are currently being prepared for launch and operations. The list is organized in order of scheduled launch/completion; dates are subject to change.
Space InfraRed Telescope Facility (Launch: 2003 April)
Space Science Missions Under Study
These missions are in the study phase. They are either expected to eventually enter development, or are potential development starts selected under an Announcement of Opportunity.
You may also be interested in some very preliminary mission concepts .