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A LITTLE SOMETHING WORTH KNOWING

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HistoryOne small ahaInvention or discovery

Launched by the Soviet Union in 1957, this was the first artificial Earth satellite.

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HistoryOne small aha
Your new ahaSputnik 1

Sputnik 1 was the first artificial satellite placed in Earth orbit. Source: Sputnik 1 ↗

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  1. 27He developed the theory of general relativity, published in 1915.RECALL
    Albert Einstein

    Published in 1915

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  2. 28This early photographic process, announced in 1839, produced images on silver-coated copper plates.RECALL
    Daguerreotype

    Introduced in 1839

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  3. 29Alexander Parkes introduced this early manufactured plastic derived from cellulose at the 1862 London exhibition.RECALL
    Parkesine

    Invented by Alexander Parkes

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