WonderFact194 of 1,961

The first words spoken from the Moon were heard on Earth almost instantly, but the signal travelled across nearly 400,000 kilometres (250,000 miles).

Ikigai Daily

Why it matters

The idea in context

Radio signals travel at light speed, so the Moon's words reached Earth in about 1.3 seconds — near-instant, yet still a measurable delay across 384,000 km (239,000 miles).

Türkçe

Aynı kart, başka bir dilde.

Ay'dan söylenen ilk sözler Dünya'da neredeyse anında duyuldu, ama sinyal yaklaşık 400.000 kilometre (250.000 mil) yol kat etti.

Radyo sinyalleri ışık hızında gider; bu yüzden Ay'dan gelen sözler Dünya'ya yaklaşık 1,3 saniyede ulaştı — neredeyse anlık, ama 384.000 km (239.000 mil) boyunca yine de ölçülebilir bir gecikme.

Source trail

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Background reading: MoonAttribution and context are revised when stronger evidence appears. Corrections are welcome through the editorial page.

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Next in the open archiveThe Berlin Wall stood for 28 years and fell in 1989.Q0210

The first words spoken from the Moon were heard on Earth almost instantly, but the signal travelled across nearly 400,000 kilometres (250,000 miles).

The idea in context

Aynı kart, başka bir dilde.

Read beyond the card.

Keep following this thread.

The Apollo Guidance Computer flew astronauts to the Moon with about 4 KB of working memory — your phone has roughly a million times more.

The Antikythera mechanism was an ancient Greek device that could predict astronomical cycles.

The laser was first demonstrated in 1960 and is now used in surgery, manufacturing, data storage, and global fibre communication.

Sputnik, the first artificial satellite, was launched by the Soviet Union on 4 October 1957, shocking the Western world and igniting the Space Race.

The first optical telescope was built in the Netherlands around 1608. Galileo improved the design and used it to discover Jupiter's moons and study the Moon's surface.