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The day of the first published photograph of a black hole – level 1

10-04-2019

Messier 87 is a galaxy. It is 55 million light-years away...



The day of the first published photograph of a black hole – level 2

10-04-2019

The first black hole ever photographed is located at the center...



The day of the first published photograph of a black hole – level 3

10-04-2019

The first black hole that was photographed is located at the...



The day of the Smolensk air disaster – level 1

10-04-2010

On April 10, 2010, a Polish plane is flying to Russia....



The day of the Smolensk air disaster – level 2

10-04-2010

On April 10, 2010, a Polish plane was flying to Russia....



The day of the Smolensk air disaster – level 3

10-04-2010

On April 10, 2010, a Polish government plane headed to Russia...



The day the American Civil War ended – level 1

09-04-1865

In 1861, the situation in the United States isn’t easy. There...



The day the American Civil War ended – level 2

09-04-1865

In the middle of the 19th century, the situation in the...



The day the American Civil War ended – level 3

09-04-1865

In the middle of the 19th century, the situation on the...



The day four pirates attacked a big ship – level 1

08-04-2009

In 2009, four Somali pirates attack a US ship. It happens...