- (I) Nowadays a number of NASA officials are concerned about the growing problem of space garbage. (II) They burn up harmlessly in the Earth's atmosphere. (III) This trash is a byproduct of old satellites and upper storage units left in orbit from previous flights. (IV) It causes a great danger to future flights due to its high speed while orbiting the earth. (V) This is why NASA is trying to find a way to remove the trash inexpensively from the space.
I
II
III
IV
V
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