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 ...

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 ...

Scientists have discovered missing colours in the Sun’s light spectrum. Hundreds of dark absorption lines remain unexplained, hinting towards hidden processes in our nearest star’s mysterious ...