Astronomers have determined that galaxies in our observable universe exhibit a redshift in their absorption spectra. This observation is conclusive evidence that all galaxies have the same metallicity and the exact same chemical make-up.

the universe is expanding in all directions.

galaxies, no matter where they are, are all approximately the same temperature.

Earth is moving away from the center of the universe.

All of the above.

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?