To understand redshift and blueshift, first, you need to remember that visible light is a spectrum of color each with a different wavelength. According to NASA, violet has the shortest wavelength ...

Not 13.8 But Possibly 26 Billion Years Old: New Study Around two years ago, certain observations by the James Webb Space ...

The idea that the universe is expanding was first proposed by Edwin Hubble in the late 1920s and has been repeatedly backed ...

Usually, redshift is discussed when talking about the expansion of the universe. An event 13.8 billion years ago, dubbed the Big Bang , caused the rapid inflation and expansion of space-time.

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 .

Nowhere is this more true than in the case of gravitational redshift. If you shoot a light beam straight up from Earth’s surface to the top of a 100-foot (30.5 meter) tower, ...

This discovery came in 1959, when researchers measured the gravitational redshift in gamma-ray light emitted in a lab here on Earth. "This was a groundbreaking experiment," Wojtak said.