Photograph from a Soviet Academy of Science 1927 expedition led by Leonid Kulik shows hundreds of trees fallen from a huge explosion, now known as the Tunguska Event, which occurred on June 30, 110 years ago. Occurring in a remote area of Siberia near the Stony Tunguska River in 1908, no known person actually observed the explosion, which is speculated to have been caused by an air burst of a meteor, asteroid, or comet fragment.
(Image Source: https://todiscoverrussia.com/tunguska-meteorite-in-siberia-is-the-mystery-unraveled/)
Astronomical Calendar for 2018 June ---
Link >>> http://buhlplanetarium4.tripod.com/astrocalendar/2018.html#jun
Related Blog Posts ---
"Science Experiments Children & Teens Can Do At Home !" 2018 June 5.
"Astronomical Calendar: 2018 May." 2018 May 1.
Source: Friends of the Zeiss.
2018 June 1.
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Formerly Astronomical Observatory Coordinator & Planetarium Lecturer, original Buhl Planetarium & Institute of Popular Science, Pittsburgh's science & technology museum from 1939 to 1991.
Author of History Web Sites on the Internet --
* Buhl Planetarium, Pittsburgh:
* Adler Planetarium, Chicago:
* Astronomer, Educator, Optician John A. Brashear:
< http://johnbrashear.tripod.com >
* Andrew Carnegie & Carnegie Libraries: