Simple Past versus Present Perfect
Use the simple past to talk about events that began and ended in the past.
The Russians launched the first artificial satellite in 1957.
Use the present perfect to talk about an indefinite time in the past.
Many countries have launched satellites into space.
Also use the present perfect to talk about events that began in the past and continue
into the present
The United States has launched many astronauts into space since 1969.
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