Element II Lesson 6 Space Debris
Fill the blanks.
On a clear night, you can look at the stars ( )
the sky. ( ) ( ) you cannot
see it, you are also looking at the largest junkyard in the solar system.
( 1 ) higher than the highest clouds but much closer than the
moon, the junkyard stretches ( ) 20,000 miles overhead.
There are tens ( ) millions of pieces of junk there.
Some are rocks and dust from ( 2 ) comets, but most are and
called “orbital debris.”
Astronauts have lost a camera, tools, and a glove in space. Most of the
junk, however, comes ( ) large satellites and rockets
that fell apart ( ) they stopped ( 3 ).
Together, all the space junk would weigh about 11 million pounds ( )
the Earth, or more than 3,000 cars. The largest piece is a part ( )
rocket about the size of a family car. The smallest piece is smaller than
your fingernail. Most pieces fly ( ) space ( )
more than 20 times the speed that sound travels on the Earth. A small stone
in orbit ( ) the Earth can have ( )
much energy ( ) a bowling ball ( 4 )
500 miles per hour, or a car going 30 miles per hour.
The junkyard is a serious problem ( ) the future
of space travel. You’ve got thousands of satellites ( )
orbit all the time. ( ) tracking debris, you cannot
avoid collisions. In 1983, a small crack appeared ( )
one window of the space shuttle Challenger ( )
it was in space. That was caused ( ) a small, orbiting
piece of paint. If the shuttle had been struck by a larger piece of junk,
the astronauts might have been ( ) danger. When
the space shuttle Endeavour returned ( ) the Earth,
its body had small holes ( ) space garbage. Two
satellites also had to change direction to avoid collisions ( )
big pieces of junk.
Conjugate the word place, pass, work, and go to fit the parenthesis 1 to