This is the 11161st most frequent Russian word.
гравитацию
Gravity.
The word 'гравитацию' is used here as a noun in the accusative case, indicating the concept of gravity that is experienced.
Гравитацию можно ощутить, когда предметы падают на землю.
Gravity can be felt when objects fall to the ground.
The word 'гравитацию' acts as the direct object of the verb 'изучают', showing that gravity is the subject under study.
Учёные изучают гравитацию, чтобы понимать движение планет.
Scientists study gravity to understand the motion of planets.
The word 'гравитации' is in the genitive case due to its usage after the preposition 'без', indicating absence of gravity.