They have extremely weak hydrogen lines, if they are present at all, and mostly neutral metals ( titanium oxide become present.
22.
At Masulipatam, Pogson detected the hydrogen lines in emission, as had all the teams that had a programme of observation with the spectroscope.
23.
Assuming that the hydrogen atoms are uniformly distributed throughout the galaxy, each line of sight through the galaxy will reveal a hydrogen line.
24.
Classical mechanics predicted that a collection of stars could be supported against gravitational collapse by either 21 cm hydrogen line in the 1930s.
25.
In 1939 he proved hydrogen emissions in aurora borealis, and in 1948 he pointed out the doppler effect in hydrogen lines of aurora borealis.
26.
Nobody could predict the wavelengths of the hydrogen lines until 1885 when the Balmer formula gave an empirical formula for the visible hydrogen spectrum.
27.
Hydrogen is easily detected in the ultraviolet ( UV ) and visible ranges from its absorption and emission of light ( the hydrogen line ).
28.
They have strong hydrogen lines, at a maximum by A0, and also lines of ionized metals ( Ca II lines is notably strengthening by this point.
29.
AE And has prominent allowed and forbidden Fe II and hydrogen lines in its emission spectrum, as well as weaker He I and N II lines.
30.
When pointed to the horizon, the telescope was 81 % efficient at wavelengths of 21 cm ( the hydrogen line ), dropping to 45 % at 11 cm.
