Light should be dispersion in the gravitational field:
www.preprints.org/manuscript/202207.0145/v3
Therefore, to have a right measurement of the numbers and spectrogram of the celestial objects and to have an accurate measurement of the size and distance of a celestial object, light dispersion in gravitational field need be considered.
For example, as one galaxy with multi-wavelengths was observed as several galaxies with one wavelength, it should result in that the numbers and spectrogram of the galaxy is wrong. Further, it should result in that the conclusion about the origin and the element making up of the galaxy is wrong.
And, the observed size and distance of the galaxy are not accurate.
Therefore, astronomical observation need be reconsidered as Light dispersion in gravitational field is known.