01. Isaac Newton began his famous experiments with [gravity] in 1664.
02. Galileo helped us to understand motion and [gravity] when he began to study falling bodies.
03. The moon's [gravitational] field exerts tidal forces on our oceans.
04. A falling body is accelerated at 9.8 m/sec2 due to [gravity].
05. The atmosphere of Mars is very thin because the low [gravity] is unable to retain most gases.
06. By considering the motion of the moon, Isaac Newton was able to demonstrate that objects attract each other with a [gravitational] force that is proportional to the product of their masses.
07. One needs to understand Newton's laws of motion and [gravity] to understand orbital motion.
08. An object in space would move along a straight line and quickly leave the Earth were it not for the earth's [gravity] forcing it to follow a curved path.
09. Albert Einstein published two theories that extended the known laws of motion and [gravity].
10. Einstein's theory of relativity held that a [gravitational] field is a curvature of time-space caused by the presence of a mass.
11. Our sun, like all stars, is held together by its own [gravity].
12. The moon's [gravity] is only one sixth that of the Earth.
13. Over time [gravity] can kill a star by crushing it in on itself.
14. A star is simply a huge ball of gas caught in a battle between [gravity] trying to make it contract, and nuclear fusion trying to make it expand.
15. As an object shrinks, its density and the strength of its [gravity] at its surface increases.
16. A space vehicle must move at a rate of at least 17 miles per second to escape Earth's [gravitational] pull.
17. In space, astronauts can't cry because there is no [gravity], so the tears can't flow.
18. The spaceship was having trouble leaving the atmosphere of the dark planet because the [gravitational force] was too strong.
19. Some scholars suggest that Galileo's book Principia may have contained a general formulation of the concept of [gravity].
20. The largest part of a rocket is simply a gas tank for holding the vast amounts of fuel needed to get the rocket past our Earth's [gravitational] pull.
21. Most of the fuel used by rockets is used in the first phase of the rocket's flight because it has to escape the [gravitational] pull inside the Earth's atmosphere.
22. Albert Einstein once remarked that [gravitation] cannot be held responsible for people falling in love.
23. Legend has it that Isaac Newton formulated the principle of [gravity] while sitting under an apple tree.
24. The action of the ocean's tide is caused by the [gravitational] force of the moon.
25. An Armenian proverb notes that the [gravity] of the earth is so strong that the old gray man walks crooked.
26. Leon Trotsky once claimed that not believing in force is the same as not believing in [gravity].
27. Someone once joked, "There is no [gravity]. The earth sucks."

Grammatical examples in English. 2013.

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