Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer, left, and Joseph Norman Lockyer (1836-1920), English astronomer. In 1868 while making spectroscopic studies of solar prominences, working independently, both men observed a yellow line in the solar spectrum. Lockyer named it Helium from helios, sun. Obverse of a commemorative medal.

px px dpi = cm x cm = MB
Details

Creative#:

TOP09101502

Source:

達志影像

Authorization Type:

RM

Release Information:

須由TPG 完整授權

Model Release:

NO

Property Release:

NO

Right to Privacy:

No

Same folder images:

Same folder images