Recent News

Learn all about our exciting discoveries in astronomy and astrophysics, which extend across the scope of the cosmos, from exoplanets to the earliest stars and galaxies. 

Mirror lab staff review the glass placed in the Giant Magellan Telescope mirror mold, checking for space. Credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

Hot Off the Presses

Research Area
Type
Division
Sort by

Filter By:

Type
Research Area
Division
Sort by
1073 results found for:
Nettie Marie Stevens is shown here looking through a microscope while studying at the Stazione Zoologica in Naples, Italy.

Nettie Marie Stevens is shown here looking through a microscope while studying at the Stazione Zoologica in Naples, Italy, in 1909. In 1904, soon after getting her Ph.D. in biology, Stevens was awarded a grant from Carnegie Science. Her 1905 paper “Studies in Spermatogenesis with Especial Reference to the Accessory Chromosome” produced some of the first work offering cytological evidence demonstrating that the X and Y chromosomes were associated with sex determination. Image Courtesy Bryn Mawr College Special Collections. 
Feature Story

Nettie Stevens Biography