THE vast work of determining and cataloguing radial velocities has made the slitless spectrograph almost indispensable. A number of stars may then be photographed on the same plate at the same time.

GAMOW 1 has attempted to explain the lack of correlation between apparent brightness and red-shift of quasi-stellar objects 2,3 as being caused by the fact that the red-shifts are measured from ...

The unidentified stellar emission lines at 4485 Å and 4503 Å have been detected in O mainsequence spectra by means of high-resolution, high-S/N observations. Previously these lines were known only in ...

In the early 1900s an astronomer named Annie Jump Cannon set out to catalogue the stars. Because she was a woman, she wasn't considered an astronomer, but a computer. Part of a team of women ...