◆ On this day

June 30

4 sourced moments from June 30 in history: A daredevil walked a tightrope across Niagara Falls (1859); Einstein sent in special relativity on 30 June 1905; Tunguska 1908: an asteroid airburst that left no crater, plus 1 more.

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4 things happened on June 30

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1971 Space · Space Exploration

The Soyuz 11 crew are the only people to die in space

On June 30, 1971, a valve jolted open about 80 miles up and emptied Soyuz 11's cabin in under a minute; the crew weren't wearing pressure suits.

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1908 Space · Solar System

Tunguska 1908: an asteroid airburst that left no crater

On 30 June 1908 a space rock exploded 10 km above Siberia and felled 80 million trees; scientists took 19 years to reach the site.

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1905 Science · Physics

Einstein sent in special relativity on 30 June 1905

Annalen der Physik received Einstein's relativity paper on 30 June 1905 and printed it in September — written by a patent clerk who left almost no paper trail.

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1859 Sports · Extreme Sports

A daredevil walked a tightrope across Niagara Falls

On June 30, 1859, Charles Blondin strolled a rope above the Niagara gorge as 25,000 spectators held their breath.

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