Pioneer 10 sends its final decipherable message (2002)

posted Monday, 27 April 2015

The last successful reception of telemetry from Pioneer 10 occurred on 27 April 2002 —33 minutes of clean data received from a distance of 80.22 AU.

Position of Pioneer 10 in 2010[animate]


Chernobyl Nuclear Disatser (1986)

posted Saturday, 25 April 2015

On 26 April 1986 at 01:23:45 Moscow Time, one of the four reactors at the Chernobyl power plant in northern Ukraine exploded. This was and still is the world’s worst nuclear accident.

Einstein’s third letter to President Roosevelt (1940)

posted Saturday, 25 April 2015

This is only a fragment of Einstein’s third letter to Roosevelt. To read all four letters from Einstein to Roosevelt, follow this link.

April 25, 1940

I am convinced as to the wisdom and the urgency of creating the conditions under which that and related work can be carried out with greater speed and on a larger scale than hitherto. I mwas interested in a suggestion made by Dr. Sachs that the Special Advisory Committee supply names of persons to serve as a board of trustees for a nonprofit organization which, with the approval of the government committee, could secure from governmental or mprivate sources or both, the necessary funds for carrying out the work. Given such a framework and the necessary funds, it (the large-scale experiments and exploration of practical applications) could be carried out much faster than through a loose cooperation of university laboratories and government departments.

Second North Korean nuclear weapon test (2009)

posted Friday, 24 April 2015

Date: 25 May 2009 (9:54 AM Korea Standard Time)
Code name: unknown
Type: plutonium fission
Yield: less than one thousand tons of TNT
Location: Kilchu-ŭp, North Hamgyŏng
Earthquake magnitude: 4.7

This test is thought to have been successful. The first nuclear weapons test by North Korea on 8 October 2006 is thought to have been a fizzle.

Soyuz 1 Disaster (1967)

posted Thursday, 23 April 2015

Cosmonaut Vladimir Komarov died when his spacecraft crashed on its return to earth. The cause of the crash was a faulty parachute. This was the first in-flight human fatality of the space program.