Explanation:

Point Nemo  When their outer space journeys come to an end, old satellites, rocket parts and space stations are sent to this desolate spot in the Paci fi c Ocean to rest on the dark seabed forever.

 The technical name for this stretch of water is the “ocean point of inaccessibility” because it lies about 2,700km from any land. But it is more commonly known as the space cemetery, or Point Nemo – named for the fi ctional submarine captain in Jules Verne’s 20,000 Leagues Under the Sea.

 It’s here that the International Space Station, the footballfi eld-sized laboratory orbiting Earth, is likely to end up.

 The Kessler Effect, or Kessler Syndrome, is the potential for the amount of debris in orbit to reach a critical mass where each collision creates more pieces of debris in a cascading way, to the point where the orbit is no longer usable.