The Secrets of the Universe: Measuring Age through Light Travel

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SUMMARY

Astronomers measure the age of celestial clusters by analyzing light waves, which reveal the time it took for light to travel to Earth. The light from distant galaxies can be up to 12.7 billion years old, allowing scientists to observe the universe's past. The age of the light does not correlate with the Earth's age, which is approximately 4 billion years. This distinction clarifies that the age of light and the age of Earth are independent measurements.

PREREQUISITES
  • Understanding of light travel time in astronomy
  • Familiarity with the concept of cosmic distances
  • Basic knowledge of the Hubble Space Telescope and its capabilities
  • Awareness of the age of the Earth and the universe
NEXT STEPS
  • Research the methods used in light wave analysis for astronomical measurements
  • Explore the implications of light travel time on our understanding of the universe
  • Learn about the Hubble Space Telescope's contributions to astronomy
  • Investigate the concept of cosmic age and its relevance in astrophysics
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Astronomers, astrophysics students, educators, and anyone interested in understanding the measurement of cosmic ages through light travel analysis.

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http://news.nationalgeographic.com/news/2005/02/0217_050217_space.html

How can we measure the cluster's age? Because astronomers are able to analyze light waves and thereby tell how long it took for the light, and the images the light creates, to reach Earth. The light that created the images of the galaxies in the photo above is about 12.7 billion years old, so you're actually looking into the distant past as well as the distant limits of the universe

Am i missing some thing? if the Earth is say 4 billion yrs old and the light travel time is 12.7 billion yrs that makes 16.7 billion yrs.
 
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why are you adding two things that have nothing to do with each other
age of the light does NOT care how old the Earth is

example Hubble is about ten years old
what does that have to do with the age of the light recorded
by the ten year old scope
 

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