17 April
1970: On 17 April 1970, Apollo 13 landed safely with a splashdown in the Pacific Ocean, four days after the spacecraft aborted its mission while it was four-fifths of the ...
31 ΔΕΚ. 2003
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1955: On 18 April 1955, Albert Einstein died.
Born in Germany, Einstein developed the special and general theories of relativity and won the Nobel Prize for Physics in 1921 for his explanation of the photoelectric effect.
Recognised as one of the most creative intellects in human history, in the first 15 years of the twentieth century Einstein advanced a series of theories that proposed entirely new ways of thinking about space, time, and gravitation. His theories of relativity and gravitation were a profound advance over the old Newtonian physics and revolutionised scientific and philosophic inquiry.
Many ESA missions are either testing Einstein's theories or observing phenomena predicted by Einstein.
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Cassini-Huygens mission
1756: On 18 April 1756, Jacques Cassini died.
Cassini was a French astronomer who compiled the first tables of the orbital motions of Saturn's satellites. Cassini was the son of Jean Dominique (Giovanni Domenico) Cassini. His father was a greatly esteemed astronomer, head of the Paris observatory, an academicien, and active in the cartographical projects of France.
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16 April
2002: On 16 April 2002, like most of the hundreds of comets found with the ESA/NASA Sun-watching spacecraft, comet SOHO-422 was first noticed by an amateur astronomer.Pictures from SOHO are ...
15 April
2002: On 15 April 2002, the European Space Agency reported that two asteroids had passed close by Earth, at distances of 1.2 and 3 times the distance to the Moon.By ...
14 April
1629: On 14 April 1629, Christiaan Huygens was born.Shortly after Galileo had first used a telescope for astronomical purposes, many other scientists decided to use this new instrument to perform ...
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