orbit; trajectory; railroad track; (right) track; proper course
monitoring; watching; observation; surveillance; guarding; supervision
defense; defence; protection
popular name; common name; nickname; alias
AD; Anno Domini; assistant director (movie, etc.)
one; for one thing; only; (not) even; just (e.g. "just try it"); some kind of; one type of
plans; arrangement; schedule; program; programme; expectation
to be disconnected; to get out of place; to miss the mark; to get it wrong (e.g. guess, expectation); to be removed; to be excluded
to notice; to recognize; to recognise; to become aware of; to perceive; to realize
complex; complicated; intricate; mixed (feelings)
n-body problem; many-body problem
by means of; due to; because of; according to
measurement error; calculation error
periodic; regular; routine
course correction; trajectory change; orbital adjustment
gap; lag; difference; discrepancy; shear (e.g. shear stress)
usual; ordinary; normal; regular; general; common
region; limits; stage; level
beginning; start; outset; at first; at the beginning; initially
collision; crash; running into; conflict; quarrel; clashing
to be conceivable that; to be thinkable that
to be scattered about; to disperse; to be littered (with)
innumerable; countless; numberless
rubbish; trash; garbage; refuse
to launch; to shoot up; (of waves) to dash; to wash up (ashore); to finish (e.g. a theater run, sumo tournament); to close
counter for occurrences; a time; an instance; inning (baseball); round; episode; chapter
ruins; wreckage; wreck; broken remains; debris
speed per second; velocity per second; instant; moment; a few seconds
several; a number of; quantity; amount; counting; figures; number
speed; velocity; pace; velocity
revolution; rotation; turning; turning (an aircraft or ship)
lacking a plan; haphazard
plan; project; schedule; scheme; program; programme
to carry on one's shoulder; to shoulder; to bear; to bear (burden, responsibility, etc.); to take upon oneself