Which statement describes redshifts?
Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a shorter wavelength.
Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.
Redshifts occur when the light source and observer move closer together, and the light observed shifts to a shorter wavelength.
Redshifts occur when the light source and observer move closer together, and the light observed shifts to a longer wavelength.

B. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

Explanation:

Redshift is a phenomenon where electromagnetic radiation from an object undergoes an increase in wavelength such that the light seems to be shifted towards the red part of the spectrum.  Redshifts are used to track the rotation of our galaxy by the astronomers. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

the closer the planet is to the sun, the larger the gravity

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.