Scientists assume that there are other planetary systems, but find it difficult to locate them because most stars are very far away. Even the nearest star is more than 4 light years (around 40,000 billion kilometers) away from us. Moreover, the light of a star is so strong that it completely 'outshines' the weak light of the surrounding planets. Trying to find a planetary system is like travelling away from the sun and no longer being able to see the road. For this reason, the remote planets cannot be seen even with the strongest telescopes. Astronomers can, however, measure the movements of stars and infer whether they are influenced by other heavenly bodies.
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