[originaltext] American astronauts will not return to the moon as planned if

American astronauts will not return to the moon as planned if U. S. Congress passes President Obama’s proposed budget. Obama’s budget which aims to cut funding in certain areas while increasing money used to create jobs would cancel NASA’s Constellation Program. The program has sought to send astronauts back to the moon by 2020. NASA’s program also intended to study the idea of establishing a moon colony. The program was set to follow the U. S. space agency’s shuttle missions, which are due to end in September. On its website, the White House Budget Office says the program to send astronauts to the moon is behind schedule, over budget and overall less important than other space investments. "Using a broad range of criteria, an independent review panel determined that even if fully funded, NASA’s program to repeat many of the achievements of the Apollo era 50 years later, was the least attractive approach to space exploration as compared to potential alternatives," the site says.
3. What did NASA’s Constellation Program originally plan to do?
4. What would be the main reason if the program was canceled?