* Astronomy

The first sapphires found in the United States were discovered on May 5, 1865
http://en.wikipedia.org/wiki/Yogo_sapphire

Discovery of the skull of the 'Ilford mammoth' in 1863 
http://astronomy.activeboard.com/t53584535/ilford-mammoth/

John Thomas Scopes was charged on May 5, 1925, for teaching evolution in a state-funded school.
http://en.wikipedia.org/wiki/Scopes_Trial#Origins

Tudor navy ship Mary Rose (capsized 1545) was rediscovered on the 5th May 1971
http://en.wikipedia.org/wiki/Mary_Rose

Michael James Adams (May 5, 1930 - November 15, 1967) was an American aviator

Spoiler

http://en.wikipedia.org/wiki/Michael_J._Adams

Douglas Harry Wheelock (born May 5, 1960) is an American astronaut.
http://en.wikipedia.org/wiki/Douglas_Harry_Wheelock

Charles Chree (5 May 1860 - 12 August 1928) was a British physicist
http://en.wikipedia.org/wiki/Charles_Chree

Arthur Leonard Schawlow (May 5, 1921 - April 28, 1999) was an American physicist.
http://en.wikipedia.org/wiki/Arthur_Leonard_Schawlow

Mark Waldo Zemansky (May 5, 1900 - December 29, 1981) was an American physicist. 
http://en.wikipedia.org/wiki/Mark_Zemansky

Sylvia Olga Fedoruk, OC SOM (May 5, 1927 - September 26, 2012) was a Canadian physicist
http://en.wikipedia.org/wiki/Sylvia_Fedoruk

John Frank Allen (May 5, 1908 - April 22, 2001) was a Canadian-born physicist. 
http://en.wikipedia.org/wiki/John_F._Allen

Johann Tobias Mayer (5 May 1752 - 30 November 1830) was a German physicist
http://en.wikipedia.org/wiki/Johann_Tobias_Mayer

Nellie Bly (May 5, 1864 - January 27, 1922) was the pen name of American journalist Elizabeth Cochrane Seaman.
http://en.wikipedia.org/wiki/Nellie_Bly

Frederick Augustus Porter Barnard (May 5, 1809 - April 27, 1889) was an American scientist and educationalist.
http://en.wikipedia.org/wiki/Frederick_Augustus_Porter_Barnard

Dorothy Annie Elizabeth Garrod (5 May 1892-18 December 1968) was a British archaeologist
http://en.wikipedia.org/wiki/Dorothy_Garrod

Elkanah Billings (May 5, 1820 - June 14, 1876) was a Canadian palaeontologist.
http://en.wikipedia.org/wiki/Elkanah_Billings

Christopher Hugh "Chris" Chapman (born 5 May 1945) is a British seismologist. 
http://en.wikipedia.org/wiki/Chris_Chapman_(seismologist)

Joan Elisabeth Lowther Clarke MBE (1917 - 1996) was an English cryptanalyst who worked as a code-breaker at Bletchley Park during World War II.
http://astronomy.activeboard.com/t58974827/joan-clarke-1917-1996/

Karl Heinrich Marx (5 May 1818 - 14 March 1883) was a Prussian-German philosopher 
http://en.wikipedia.org/wiki/Karl_Marx

Manoj Sood (born May 5, 1962) is a Canadian film and television actor
http://en.wikipedia.org/wiki/Manoj_Sood

Max Tegmark (born 5 May 1967) is a Swedish-American cosmologist. 
http://en.wikipedia.org/wiki/Max_Tegmark

Judith Gamora Cohen (born May 5, 1946) is the Kate Van Nuys Page Professor of Astronomy at the California Institute of Technology
https://en.wikipedia.org/wiki/Judith_Gamora_Cohen

John William Draper (May 5, 1811 - January 4, 1882) was an American (English-born) scientist
http://astronomy.activeboard.com/t53584265/john-william-draper-1811-1882/

Albert Marth (May 5, 1828 - August 6, 1897) was a German astronomer who worked in England and Ireland.
https://en.wikipedia.org/wiki/Albert_Marth

Mervyn Archdall Ellison (May 5, 1909 - September 12, 1963) was an Irish astronomer.
http://en.wikipedia.org/wiki/Mervyn_A._Ellison

NGC 3142 was discovered by British astronomer John Herschel on the 5th May 1836.
http://astronomy.activeboard.com/t57478791/ngc-3142/

NGC 4303 was discovered by Italian astronomer Barnabus Oriani on the 5th May 1779.

Spoiler

http://astronomy.activeboard.com/t9333964/messier61/

NGC 4874 was discovered by Heinrich Louis d'Arrest on the 5th May 1864.
http://astronomy.activeboard.com/t63475436/ngc-4874/

NGC 5150 was discovered by British astronomer John Herschel on the 5th May 1834.
http://astronomy.activeboard.com/t57478749/ngc-5150/

NGC 5152 was discovered by British astronomer John Herschel on the 5th May 1834.
http://astronomy.activeboard.com/t57478743/ngc-5152/

NGC 5165 was discovered by American astronomer Sherburne Wesley Burnham on the 5th May 1883.
http://astronomy.activeboard.com/t57478735/ngc-5165/

NGC 5171 was discovered by American astronomer George Washington Hough on the 5th May 1883.
http://astronomy.activeboard.com/t57478725/ngc-5171/

NGC 5179 was discovered by American astronomer Sherburne Wesley Burnham on the 5th May 1883.
http://astronomy.activeboard.com/t57478715/ngc-5179/

NGC 5191 was discovered by American astronomer George Washington Hough on the 5th May 1883.
http://astronomy.activeboard.com/t57478709/ngc-5191/

NGC 5328 was discovered by William Herschel on the 5th May 1793.
http://astronomy.activeboard.com/t63208202/ngc-5328/

Messier 102 (NGC 5866) was independently discovered by William Herschel on May 5, 1788.

Spoiler

http://astronomy.activeboard.com/t43004335/messier-102/

NGC 5904 was discovered on the 5th May 1702. 
http://astronomy.activeboard.com/t15315088/messier-5/

NGC 5907 was discovered by William Herschel on the 5th May 1788.

Spoiler

http://astronomy.activeboard.com/t47912125/ngc-5907/