Page 624 - 89 history of astronomy_opt

seen with an opera-glass. As with the other
˜
NovA, when it first dashed into the neb-
ula it was vaporised and gave a continuous
spectrum with dark lines of hydrogen and
helium. It showed no bright lines paired
with the dark ones to indicate a train left
behind; but in the end its own luminosity
died out, and the nebular spectrum pre-
dominated.
624