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To be completely honest, we can't be certain that the universe IS expanding. Edwin Hubble observed that distant galaxies in every different direction all display a "red shift" of the light waves, indicating that they are moving away from us - and the farther away they are, the faster they appear to be going.
Hubble's explanation that this could be caused if the entire universe is expanding like a balloon fits the observed evidence - but it isn't proof. However, it is widely accepted by most astronomers that this is the proper explanation. Discoveries made in the future will serve to either confirm this, or to cast doubt on Hubble's understanding.
What else can I help you with?
Who showed that galaxies exist and observed the universe is expanding?
Edwin Hubble.
Who showed other galaxies existed and observed the universe is expanding?
Edwin Hubble
Who showed that other galaxies existed and observed that the universe expanding?
Eddie Hubble
Who showed other galaxies existed and observed the universe expanding?
Edward Hubble
Who showed that other galaxies existed and observed that the universe was expanding?
Edwin hubble >:d
Who was the person that showed that the other galaxies existed and observed that the universe is expanding?
Edwin Hubble ;3
Is universe getting bigger?
Yes. To be more exact, it is "space" within the "observed universe" that is expanding. A confusing fact is that many astronomers believe the universe as a whole may already be infinite in size. This doesn't stop them saying the observable universe is still expanding. "Infinity" is a tricky idea.
Is the universe expanding or contracting?
The universe is expanding.
Who showed that other galaxies existed and observed that the universe i s expanding?
Edwin Hubble, after whom the space telescope was named.
Observation of the red shift of galaxies suggest that the universe is what?
Expanding Or that the light is exiting a gravity hole (star).
What scientist first established that the universe is expanding?
Edwin Hubble
Based on the observed red shifts in the spectral lines of distant galaxies?
Astronomers conclude that the universe is expanding, because wavelengths are increasing.
