Aircraft fly and stay in the air because the force of gravity is balanced by the force of lift created by the wings as air rushes over them, and because the force of air friction is balanced by the force of thrust created by the engines.
There are more than 1 million types of planes in the world
128.64 hundreds.128.64 hundreds.128.64 hundreds.128.64 hundreds.
Up, up, and away! A helium balloon rises rapidly until one of two things happens due to the falling air pressure with rising altitude: the balloon expands and pops and the remnants fall back to earth, or the balloon reaches an altitude where it can't rise further and the high altitude winds carry it off. Eventually if it has not popped the helium will slowly escape and it will fall back to earth. By the time it does fall back to earth it is usually hundreds to thousands of miles from where it was released.
Electrical or magnetic forces are far more powerful than gravitational forces, but diminish far more rapidly with increasing distances. Over ranges of a few centimeters to a couple of meters, electrical forces are quite powerful, but for distances of hundreds or thousands of kilometers, electrical forces are vanishing small. Gravitational forces are weaker, but the diminishing effect with distance is much less. So over interplanetary or interstellar distances, gravity is the ONLY force of any importance.
Hundreds and hundreds of people over hundreds and hundreds of years
It is an adjectival noun. Here "hundreds" stands for hundreds of people, a noun phrase. But it is shortened to hundreds.
eight hundreds (0.08)
Fifty-four hundreds.
by hundreds.
There are no hundreds.
hundreds hundreds
hundreds