An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmuted into another element through a nuclear reaction.
Almost 40 years separate Shirley Ann Jackson's achievement, as the first African-American woman to earn a Ph.D. in theoretical high energy physics at Massachusetts Institute of Technology, and Jedidah Isler, the first African-American woman to receive a Ph.D. in Astrophysics from Yale.
Lawrence paved the way for Guy Bluford, who became the first African-American in space in 1983, Dr. Mae Jemison, the first African-American woman in space in 1992, and Charles Bolden Jr., a space shuttle commander who became NASAâs first black administrator in 2009.