The picture is of a replica of Sputnik.
Here are facts about Sputnik from NASA.
Here is an essay on the website of PBS science show NOVA about the impact of Sputnik on the United States.
Here is the sound of the Sputnik telemetry signal.
Jane's Space Recognition Guide is a good book to review if you want to see pictures of various spacecraft launched since Sputnik.
Sputnik is an interesting topic.
It is up to us to learn about things that interest us.
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