earth14h
100 years ago: Edwin Hubble proved the Milky Way is not the only galaxy in the universe
In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...
Where does black fall on the color spectrum? A color scientist explains
Radiation within the visible spectrum can appear black if it is low in power – more specifically, lower in power than its ...