Should Mars be the main mission?
Barack Obama believes it should be possible for astronauts to orbit Mars by the mid-2030s. Is his space vision on the right course?
The White House has been under fire since announcing in February that it wanted to shut down Constellation, the current programme to replace the ageing space shuttle.
Neil Armstrong, the first man to walk on the moon said a decision to cut funding for Nasa was "devastating", but White House officials insist Mr Obama's new plans are ambitious, with the ultimate goal of reaching Mars.
Is this the right approach to space exploration? Is President Obama correct in focusing on Mars? Do you work in this science field? What are the advantages of space travel?