How does one pray in a spacecraft when unable to stand, sit, recline, bow, prostrate, or face the Qiblah, due to the absence of gravity?

The astronaut prays according to his condition, performing what he can of the actions of prayer, and what he is unable to do is waived for him. If he is able to stand, bow, prostrate, and sit, he is obligated to do so. Otherwise, it is waived for him, according to the Almighty's saying: "Allah does not burden a soul beyond its capacity."