Morality
"'Come you, monk, be of moral habit, live controlled by the control of the Obligations, endowed with [right] behavior and posture, seeing peril in the slightest fault and, undertaking them, train yourself in the rules of training.' As soon, brahman, as the monk is of moral habit, controlled by the control of the Obligations, endowed with [right] behavior and posture; seeing peril in the slightest fault and, undertaking them, trains himself in the rules of training, the Tathagata disciplines him further saying:
Sense-control
"'Come you monk, be guarded as to the doors of the sense-organs; having seen a material shape with the eye, do not be entranced with the general appearance, do not be entranced with the detail; for if one dwells with the organ of sight uncontrolled, covetousness and dejection, evil, unskillful states of mind, may flow in. So fare along controlling it, guard the organ of sight, achieve control over the organ of sight. Having heard a sound with the ear... Having smelt a smell with the nose... Having savored a taste with the tongue... Having felt a touch with the body... Having cognized a mental state with the mind, do not be entranced with the detail. For if one dwells with the organ of mind uncontrolled, covetousness and dejection, evil, unskillful states of mind, may flow in. So fare along controlling it; guard the organ of mind, achieve control over the organ of mind.'
Moderation in eating
"As soon, brahman, as a monk is guarded as to the doors of the sense-organs, the Tathagata disciplines him further, saying: 'Come you, monk, be moderate in eating; you should take food reflecting carefully, not for fun or indulgence or personal charm or beautification, but taking just enough for maintaining this body and keeping it going, for keeping it unharmed, for furthering the Brahma-faring,[4] with the thought: Thus will I crush out an old feeling, and I will not allow a new feeling to arise, and then there will be for me subsistence and blamelessness and abiding in comfort.'
Vigilance
"As soon, brahman, as a monk is moderate in eating, the Tathagata disciplines him further, saying: 'Come you, monk, dwell intent on vigilance; during the day while pacing up and down, while sitting down, cleanse the mind of obstructive mental states; during the middle watch of the night, lie down on the right side in the lion posture, foot resting on foot, mindful, clearly conscious, reflecting on the thought of getting up again; during the last watch of the night, when you have arisen, while pacing up and down, while sitting down, cleanse the mind of obstructive mental states.'
Mindfulness and clear consciousness
"As soon, brahman, as a monk is intent on vigilance, the Tathagata disciplines him further, saying: 'Come you, monk, be possessed of mindfulness and clear consciousness, acting with clear consciousness whether you are approaching or departing, acting with clear consciousness whether you are looking ahead or looking round, acting with clear consciousness whether you are bending in or stretching out [the arms], acting with clear consciousness whether you are carrying the outer cloak, the bowl or robe, acting with clear consciousness whether you are eating, drinking, munching, savoring, acting with clear consciousness whether you are obeying the calls of nature, acting with clear consciousness whether you are walking, standing, sitting, asleep, awake, talking or being silent.'
Overcoming of the five hindrances
"As soon, brahman, as he is possessed of mindfulness and clear consciousness, the Tathagata disciplines him further, saying: 'Come you, monk, choose a remote lodging in a forest, at the root of a tree, on a mountain slope, in a glen, a hill cave, a cemetery, a woodland grove, in the open, or on a heap of straw.' On returning from alms-gathering after the meal, the monk sits down crosslegged, holding the back erect, having made mindfulness rise up in front of him. He, getting rid of covetousness for the world, dwells with a mind devoid of covetousness, he cleanses the mind of covetousness. Getting rid of the taint of ill-will, he dwells benevolent in mind; compassionate and merciful towards all creatures and beings, he cleanses the mind of ill-will. Getting rid of sloth and torpor, he dwells without sloth or torpor; perceiving the light, mindful and clearly conscious he cleanses the mind of sloth and torpor. Getting rid of restlessness and worry, he dwells calmly; the mind inward tranquil, he cleanses the mind of restlessness and worry. Getting rid of doubt, he dwells doubt-crossed; unperplexed as to the states that are skilled,[5] he cleanses his mind of doubt.
Jhana
"He, by getting rid of these five hindrances,[6] which are defilements of the mind and deleterious to intuitive wisdom, aloof from pleasures of the senses, aloof from unskilled states of mind, enters and abides in the first meditation which is accompanied by initial thought and discursive thought, is born of aloofness and is rapturous and joyful. By allaying initial thought and discursive thought, his mind subjectively tranquilized and fixed on one point, he enters and abides in the second meditation which is devoid of initial thought and discursive thought, is born of concentration and is rapturous and joyful. By the fading out of rapture, he dwells with equanimity, attentive and clearly conscious, and experiences in his person that joy of which the ariyans[7] say: 'Joyful lives he who has equanimity and is mindful,' and he enters and abides in the third meditation. By getting rid of anguish, by the going down of his former pleasures and sorrows, he enters and abides in the fourth meditation which has neither anguish nor joy, and which is entirely purified by equanimity and mindfulness.
"Brahman, such is my instruction for those monks who are learners who, perfection being not yet attained, dwell longing for the incomparable security from the bonds. But as for those monks who are perfected ones, the cankers destroyed, who have lived the life, done what was to be done, shed the burden, attained to their own goal, the fetters of becoming utterly destroyed, and who are freed by perfect profound knowledge — these things conduce both to their abiding in ease here and now as well as to their mindfulness and clear consciousness."
https://accesstoinsight.org/tipitaka/mn/mn.107.horn.html or
https://suttacentral.net/mn107/en/sujato
The point is the space explorer should practice like a Buddhist monk for a Vasa ( at least ), you will have mindfulness more than Astronaut Chad!
Samaññaphala Sutta: The Fruits of the Contemplative