-- The object's weight is different on each planet, while it is
apparently weightless during the trips in between.
-- On some if not all of the three planets, the object needs to be
surrounded by protection from heat, cold, poisonous gases, or
solar radiation.
-- If the object is any kind of life form, then its circadian rhythm is
all screwed up, and it is having trouble sleeping.
-- The object has accumulated a huge balance of frequent flier miles.
