The first-recorded European contact with Easter Island was on April 5 (Easter Sunday), 1722http://astronomy.activeboard.com/t12504882/easter-island/Ripple Rock, an underwater twin-peaked mountain, was destroyed by a planned explosion on April 5, 1958.http://en.wikipedia.org/wiki/Ripple_Rock
The Mount Vesuvius eruption of April 5, 1906 ejected the most lava ever recorded from a Vesuvian eruption.http://en.wikipedia.org/wiki/Mount_Vesuvius#Eruptions_in_the_20th_centuryIn 1900, Archaeologists discovered clay tablets with hieroglyphic writing in a script they called Linear B.http://astronomy.activeboard.com/t35272386/minoan-deities/The Galileo Galilei planetarium was officially opened to the public on April 5, 1968http://en.wikipedia.org/wiki/Galileo_Galilei_planetarium
The first successful Pegasus launch occurred on April 5, 1990http://en.wikipedia.org/wiki/Pegasus_%28rocket%29#Pegasus_program
STS-37 was launched on the 5th April 1991http://en.wikipedia.org/wiki/STS-37The Compton Gamma Ray Observatory was launched from STS-37 on 5 April 1991http://en.wikipedia.org/wiki/Compton_ObservatorySTS-131 was launched on the 5th April 2010http://en.wikipedia.org/wiki/STS-131The Kwangmyongsong-2 satellite was launched in April 2009.http://astronomy.activeboard.com/t26773604/taepodong-2-missile-test/
On April 5, 2063, Zefram Cochrane made Earth's first warp flighthttp://en.wikipedia.org/wiki/Zefram_Cochrane
Milton Orville Thompson (4 May 1926 - 6 August 1993) was a NASA research pilot http://en.wikipedia.org/wiki/Milton_O._Thompson
Franklin Ramón Chang Díaz (born April 5, 1950) is a Costa Rican-American engineer and former NASA astronaut. http://en.wikipedia.org/wiki/Franklin_Chang_D%C3%ADazJudith Arlene Resnik (April 5, 1949 - January 28, 1986) was an American engineer and a NASA astronauthttp://en.wikipedia.org/wiki/Judith_ResnikSergey Alexeyevich Chaplygin (April 5, 1869 - October 8, 1942) was a Russian and Soviet physicisthttp://en.wikipedia.org/wiki/Sergey_ChaplyginDonald Lynden-Bell (April 5, 1935 - 5 February 2018) was an English astrophysicisthttp://en.wikipedia.org/wiki/Donald_Lynden-BellVincenzo Viviani (April 5, 1622 - September 22, 1703) was an Italian mathematician and scientist. http://en.wikipedia.org/wiki/Vincenzo_VivianiEdward A. Halbach (April 5, 1909 - March 20, 2011) was an American amateur astronomer http://en.wikipedia.org/wiki/Edward_A._HalbachNancy Holt (April 5, 1938 - February 8, 2014) was an American artist most known for her public sculptureshttp://en.wikipedia.org/wiki/Nancy_Holt
Messier 50 was discovered by Charles Messier on the 5th April 1772.http://astronomy.activeboard.com/t57218080/messier-50/NGC 2786 was discovered by Albert Marth on the 5th April 1864.http://astronomy.activeboard.com/t57218059/ngc-2786/NGC 3357 was discovered by Albert Marth on the 5th April 1864.http://astronomy.activeboard.com/t57218043/ngc-3357/NGC 3382 was discovered by Lawrence Parsons, 4th Earl of Rosse on the 5th April 1874.http://astronomy.activeboard.com/t57218016/ngc-3382/NGC 3751 was discovered by Ralph Copeland on the 5th April 1874.http://astronomy.activeboard.com/t57218005/ngc-3751/NGC 3754 was discovered by Ralph Copeland on the 5th April 1874.http://astronomy.activeboard.com/t57217989/ngc-3754/NGC 4230 was discovered by John Herschel on the 5th April 1837.http://astronomy.activeboard.com/t57217975/ngc-4230/NGC 5226 was discovered by Johann Louis Emil Dreyer on the 5th April 1877.http://astronomy.activeboard.com/t57217964/ngc-5226/
Asteroid (24) Themis was discovered on April 5, 1853 by Italian astronomer Annibale de Gasparis.http://en.wikipedia.org/wiki/24_ThemisAsteroid (257) Silesia was discovered by Johann Palisa on April 5, 1886 in Vienna.http://en.wikipedia.org/wiki/257_SilesiaStellar X-ray astronomy started on April 5, 1974, with the detection of X-rays from Capella.http://adsabs.harvard.edu/doi/10.1086/181741http://en.wikipedia.org/wiki/Capella#X-ray_sourceKappa-Serpentids meteor maximum in the constellation Serpens Caput on the 5th April. http://astronomy.activeboard.com/t35067193/kappa-serpentids-meteor-shower/5 April 1948, Holloman Air Force Base, New Mexico: Three balloon observers saw an object very high in the skyhttp://astronomy.activeboard.com/t57220555/holloman-incident-no-122/A phenomenon was seen to pass Baton Rouge on the night of the 5th April 1800http://astronomy.activeboard.com/t57220080/baton-rouge-1800-meteor/On April 5. 1820, an aerolite fell on board a vessel in lat. about 20° N., and 51° W. long. http://astronomy.activeboard.com/t57219112/april-5-1820-aerolite/
MeteoritesThe High Possil meteorite fell on the morning of Thursday, 5 April 1804http://astronomy.activeboard.com/t11037733/the-high-possil-meteorite/The Pampanga (L5) meteorite fell in Central Luzon, Philippines, on the 5th April, 1859.http://astronomy.activeboard.com/t48590310/pampanga-meteorite/The Ekh Khera (H6) meteorite fell in Uttar Pradesh, India, on the 5th April, 1916.http://astronomy.activeboard.com/t48590316/ekh-khera-meteorite/The Ekeby (H4) meteorite fell in Malmohus, Sweden, on the 5th April, 1939.http://astronomy.activeboard.com/t48590319/ekeby-meteorite/