What causes the dark absorption lines found within a star's spectrum?
Answer
Specific chemical elements absorbing photons at precise wavelengths
Dark lines occur because specific chemical elements, such as hydrogen or calcium, absorb photons at very precise, known wavelengths as the light passes through the gas in the star's outer atmosphere.
#Videos
Why Is The Universe Expanding? Red-Shift & Doppler Effect ...
Related Questions
What is the primary indicator that the fabric of space itself is expanding?Which wavelength corresponds to the red end of the visible light spectrum?What causes the dark absorption lines found within a star's spectrum?How do scientists determine the precise shift of distant astronomical objects?What common phenomenon is used as an analogy for the Doppler effect applied to light shifts?What physical process causes the cosmological redshift observed in very distant galaxies?In Hubble's Law ($v = H_0 d$), what variable represents the recessional velocity?What effect are observations suggesting dark energy is causing in the universe's expansion?When light from a source moves away from an observer, how does the resulting wavelength change?If a galaxy emitted light that was perfectly green (550 nm) and it is measured today with a redshift ($z$) of 1.0, what is the observed wavelength?