Answer:
The atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus
This shifts the star’s spectral lines toward the blue end of the spectrum. If the star is moving away from us, it’s waves are effectively stretched out when they reach earth, increasing their wavelength. This shifts the star’s spectral lines toward the red end of the spectrum.
Answer:
Cement and sand will do
Explanation:
because without it you can't build
