Redshift Calculator
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Data Source and Methodology
All calculations are rigorously based on the principles outlined in the NASA/IPAC Extragalactic Database. All calculations are based strictly on the formulas and data provided by this source.
The Formula Explained
The redshift \( z \) is calculated using the formula:
\[ z = \frac{\lambda_{\text{observed}} - \lambda_{\text{emitted}}}{\lambda_{\text{emitted}}} \]
Glossary of Variables
- Observed Wavelength (λobserved): The measured wavelength of the light received.
- Emitted Wavelength (λemitted): The original wavelength of the light when it was emitted.
- Redshift (z): The dimensionless measure of how much the wavelength of the light has been stretched.
How It Works: A Step-by-Step Example
Suppose a galaxy emits light at a wavelength of 400 nm, but we observe it at 500 nm. The redshift \( z \) is calculated as follows:
\[ z = \frac{500 - 400}{400} = 0.25 \]
This indicates that the galaxy is moving away, stretching the light's wavelength by 25%.
Frequently Asked Questions (FAQ)
What is redshift?
Redshift is a phenomenon where the wavelength of light from an object increases as the object moves away from the observer.
How is redshift calculated?
Redshift is calculated using the formula \( z = \frac{\lambda_{\text{observed}} - \lambda_{\text{emitted}}}{\lambda_{\text{emitted}}} \).
Why is redshift important?
Redshift helps astronomers determine the speed at which an object is moving away from Earth, providing insights into the universe's expansion.
What causes redshift?
Redshift is caused primarily by the Doppler effect and the expansion of the universe.
Can redshift be negative?
No, a negative redshift would indicate blueshift, where an object is moving closer, compressing the light's wavelength.