Well, let's see now - the decision to terminate the Shuttle was made 6 years ago by Bush, who not only decided to kill it,
he also presented the concept of flying back to the Moon and to Mars, but failed to fund the Constellation to make it viable.
Obama and all the NASA advisors, except one (Griffin) agreed that the Moon and Mars missions were not able to be made
with current technology and the curtailed funding - they had only had 6 years to make that transition but didn't pay for it.
Obama wants to salvage the useable parts - the Orion Capsule, and replace the rocket now, and make it capable of being
launched in an unmanned configuration for deployment as an emergency rescue 'Life-Boat' and position it on the ISS to return
Astronauts from the ISS to Earth, so as not to have to depend on the Russian Soyuz vehicle which sometimes returns in
a 'Balistic Re-Entry' mode, where the riders are subjected to as much as 9 G's of force.
Obama has increased NASA funding for space flight by $ 6 Xillion for immediate relief, and the Shuttle budget will fold into that
when the Shuttle flights end later this year.
What Obama wants is to development an advanced rocket and propulsion system that is capable of flying manned flights to their
destinations within fewer years, instead of the 10 year out timeframe for the Moon, and the 20+ year timeframe for Mars.
A trip to mars using the Ares/Constellation combination would take 6 months going out, and 9 months for return - a year and a half round trip.
To land on Mars you have to assemble a landing craft in Mars orbit to ascend, and then depart to a rendesvous position for
crew transfer for the return flight. It would take several years just to prepare the Lander/Departure Craft and lift that
into position for preparation to attempt the first landing.
You have to be able of launching from the Martian surface and the associated gravity well to get back up and off the planet.
A mission to one of the Martian Moons provides the location and the proximity to acturally make that part of a mission possible.
The Space Fantasy plan that was in place and cancelled was not a viable preformable option. Water alone for the round trip
flight just to keep the Astronauts hydrated would have cost at least $4 Billion.
A 6 mont flight, with supply stops every 2 months for replenshment of food and water, and transfer of waste from the capsule
means that you had to pre-position 3 supply modules along the way going out, and another 4 on the path coming back
- that's 7 supply craft and their associated launch rockets and costs for each manned excursion.
By targeting LaGrange Points you might be able to reduce that to 2 stops going out and 3 stops for the return,
but the between flight segments increase in duration to meet each position.
Obama's desire to have advanced vehicles that can fly out on 2 months and return in 3 months, and positon construction
points on asteroids or on planetary satellites is a much more feasable target, it pulls the timeframe of performance in, and
reduces the cost per launch and total flight requirements by 2/3rds.
Shuttle is a dead player, the External Tank line was shut down a year ago, and to re-start the line would take 2 years to yield the first tank.
There are only 2 Shuttle flights left, and only 3 tanks in existance.
If the choice is made to revive the 'Shuttle-C' or any of those derivatives for use, it would take an 4 years to produce the first unit.
Right now the unmanned Orion can fly on either an Atlas V or on the Delta IV by simply making a 'Spacecraft Adapter' and
that vehicle can be flown up to the ISS in late 2012 of early 2013 to position the Orion as the 'Life-Raft'.
Building an 'Ares V-Lite' instead of a cargo hauler lets us move forward with manned Orion launches by 2014, and that vehicle
can further evolve into the 'Ares V - Heavy' for deployment of equipment into holding position for rensezvous years ahead
of when we place the next generation of Orion Capsules onto faster rockets for deep space missions.
LEO (Low Earth Orbit) is one thing, EDV (Earth Departure Vehicle) is another more complex development.