One of the problems of space exploration is --------, for it is so expensive.

Space radiation is ----------- to humans.

Space --------- and space trash are synonymous.

Space junk is all the ---------- pieces that are floating around the planet.

----------- satellites represent a part of space junk.

Some space junk are the size of a -------------.

Some space junk move at -------- speeds around the Earth.

Tiny pieces of debris cause damage to -------------------.

Orbital debris serves --------- useful purpose because it includes --------- parts.

The ------------ and the ------------- are the most famous pieces of space junk.

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