The Sombrero Galaxy is located roughly 30 million light-years from the Milky Way and is moving away from the Milky Way at a speed of 1000 km/s. If we observe absorption by sodium at a wavelength of 589.0 nm in a laboratory on Earth, at what wavelength do we observe the same sodium absorption in the spectrum of the Sombrero Galaxy?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.