It's either that reason or for sure they have found a much more better replacements...Simple--1981-2011. That's thirty years. The shuttles are too old to fly and too costly to maintain.
-RODION![]()
For now, there is as yet no "official" replacements for the shuttle--the primary and sure way to get to the ISS for now, is NOT via an American spacecraft, but a Russian one (Soyuz-TMA).
There are "candidates" for replacement, but status still unsure as of this point in time:
a) The Orion CEV + Orion Booster - the issue is this program (return to the moon by George W. Bush) was cancelled by Obama, thus further testing of the Orion booster was scrapped. The CEV is still viable, but there is no booster, unless...
b) The CEV + SpaceX's Falcon Heavy - if this combination is feasable, the CEV might still be a valid spacecraft to go to the ISS.
c) The SpaceX Dragon + Falcon 9 - this is what Elon wants NASA to adapt, but still not confirmed.
-RODION
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