Final answer:
True, Redshift is a phenomenon where light from an astronomical object shifts to longer wavelengths as it moves away from us, and this is consistent with the universe's expansion as proposed by the Big Bang theory.
Step-by-step explanation:
Redshift refers to the phenomenon where the light from an object in space, such as a galaxy or a quasar, shifts to longer wavelengths on the red end of the spectrum as it moves away from the observer. This is a key piece of evidence supporting the Big Bang theory, which posits that the universe is expanding. Conversely, if an object is moving towards us, its light will be blueshifted, which means the light shifts to shorter wavelengths on the blue end of the spectrum. The significance of redshift goes beyond just determining the direction of movement; it can be used to calculate the speed at which a galaxy is receding. For instance, extensive astronomical observations have shown that all galaxies farther away than about 50 million light-years exhibit a redshift that is proportional to their distance, indicating not just movement but the expansion of space itself.