The two keys to Edwin Hubble's breakthrough discovery were ... Slipher knew that a shift toward red suggested the body was moving rapidly away from the observer. But he had no way to measure ...

This is called the red shift. Light wavelengths from an object emitting light are compressed by movement towards the observer. This is called the blue shift. Edwin Hubble was an American ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded ... which captures the intensity of light from blue to red. Astronomers call a shift to longer wavelengths a redshift.

Edwin Powell Hubble is renowned for determining that there are other galaxies in the Universe beyond the Milky Way, and for observing that the universe is expanding at a constant rate. Hubble was a ...

The Hubble constant is one of the most important numbers in cosmology because it tells us how fast the universe is expanding, which can be used to determine the age of the universe and its history. It ...

The two keys to Edwin Hubble's breakthrough discovery were ... Slipher knew that a shift toward red suggested the body was moving rapidly away from the observer. But he had no way to measure ...