adv. very much or by a lot of people
Today, there are two widely used systems of measurement around the world.
Mars
n. the fourth planet from the sun, called “the red planet”
In 1998, NASA sent a spaceship to Mars on a mission.
mission
n. an important job
In 1998, NASA sent a spaceship to Mars on a mission.
consider
v. to think carefully about something
But one of the American companies NASA worked with didn’t consider this.
spaceship
n. a vehicle used for travel in space
That company made an important computer program for the spaceship.
guess
v. to give an answer or opinion about something without knowing all the facts
As you might have guessed, it didn’t go well.
fail
v. to do badly or not succeed
The ship crashed on September 23rd, 1999, and the mission failed.
system
n. a way or method of doing things
Today, there are two widely used systems of measurement around the world.
metric
adj. units based on the gram, meter, liter, etc.
They are the metric system and the imperial system.
introduce
v. to make something exist or happen for the first time
The imperial system is older, and the metric system was introduced later.
currently
adv. at the present time; now Currently, most of the world uses the metric system.
mile
n. a measurement of distance in the imperial system
It uses measurements like miles and pounds.
pound
n. a measurement of weight in the imperial system
It uses measurements like miles and pounds.
trouble
n. a problem
Unfortunately, these two kinds of measurement systems caused trouble for the American space agency, NASA
agency
n. a part of the government that is responsible for doing a particular job
Unfortunately, these two kinds of measurement systems caused trouble for the American space agency, NASA
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