Question

provides evidence that the universe is expanding, since more distant galaxies appear red in color. greenshift pinkshift blueshift redshift question 21 (1 point) listen which of the following is the largest? a star a galaxy a solar system

Explanation:

• Redshift: In astronomy, redshift occurs when light or other electromagnetic radiation from an object is increased in wavelength (shifted towards the red end of the spectrum). This is a key piece of evidence for the expansion of the universe. As galaxies move away from us (due to the expansion of the universe), the light they emit is stretched, resulting in a redshift.
• Size comparison: A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter. A solar system consists of a star (like our Sun) and the objects that orbit it (planets, moons, asteroids, etc.). A star is a single luminous sphere of plasma. So, in terms of size, a galaxy is larger than a solar system, and a solar system is larger than a single star.

Answer:

• First question: Redshift
• Second question: A galaxy