#gravity

• Antigravity — A hypothetical phenomenon consisting of the cancellation, inversion, or neutralization of the gravitational attraction force exerted by a massive body; gravitational repulsion. In modern theoretical physics, the concept is analyzed in relation to dark energy or negative mass hypotheses.
• Anti-gravitational — Tending to cancel, counteract, or reverse the effect of the gravitational attraction force; pertaining to antigravity. In theoretical cosmology, it describes mechanical properties of dark energy, which exerts a negative pressure with an anti-gravitational effect at a cosmic scale.
• Anti-isostatic — Countering, opposing, or disrupting the isostatic equilibrium of the Earth's crust; a tectonic phenomenon, magma movement, or gravitational imbalance that prevents the restoration of the hydrostatic floating state of the lithosphere on the asthenosphere. In a structural sense, it describes density anomalies or endogenous forces that generate massive stresses in mountainous regions or oceanic basins.
• Astrobotany — An interdisciplinary scientific subdiscipline of astrobiology and applied botany that studies the growth, development, physiology, and adaptability of terrestrial plants under deep space conditions, such as microgravity, intense cosmic radiation, and controlled atmospheres within orbital stations or planetary habitats. This field lays the groundwork for bioregenerative life support systems in long-duration manned space missions while also investigating the possibility of indigenous flora on other celestial bodies.
• Astronaut — A person specifically trained and qualified to navigate in outer space or to serve as a crew member on a spacecraft, orbital station, or interplanetary vehicle. Their activity involves piloting spacecraft, conducting scientific experiments in microgravity, and performing extravehicular activities (EVA), being the standard term traditionally used by the American (NASA) and Western European aerospace programs.