B3L1U1E1S1H4I1F4T1S1
18 points
BLUESHIFTS is validvalid
BLUESHIFT, the decrease in wavelength of a signal approaching the observer [n]
BLUESHIFT, a shift of the spectrum towards the blue [n]
BLUESHIFT, the decrease in wavelength of a signal approaching the observer [n]
BLUESHIFT, a shift of the spectrum towards the blue [n]