Give some stream of consciousness and then the answer. Sputnik 2 reentered the Earth's atmosphere 14 April 1958, at approximately 0200 hrs, on a line that stretched from New York to the Amazon. Its track was plotted by British ships and 3 "Moon Watch Observations", from New York. It was said to be glowing and did not develop a tail until it was at latitudes south of 20 degrees North. Estimates put the average length of the tail at about 50 nautical miles. The satellite burned up in the atmosphere.

Answer this question: when did sputnik 2 come back to earth?
To answer the above question, the relevant sentence is: Sputnik 2 reentered the Earth's atmosphere 14 April 1958, at approximately 0200 hrs, on a line that stretched from New York to the Amazon.
Therefore, the answer is 14 April 1958.