What would make a star flash red and blue?

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SUMMARY

The phenomenon of a star flashing red and blue is primarily caused by atmospheric distortion, particularly when the star is near the horizon. This effect, known as "atmospheric scintillation," occurs due to varying air densities and temperatures, which cause the light from the star to refract and spread into its constituent colors. The discussion highlights that poor atmospheric conditions, referred to as "bad seeing," exacerbate this visual effect, making the star appear to change colors rapidly.

PREREQUISITES
  • Understanding of atmospheric optics
  • Familiarity with the concept of scintillation
  • Basic knowledge of light refraction
  • Awareness of astronomical observation techniques
NEXT STEPS
  • Research atmospheric scintillation and its effects on stargazing
  • Learn about light refraction and its role in astronomy
  • Explore techniques to improve astronomical observation during poor seeing conditions
  • Investigate tools for measuring atmospheric conditions, such as weather balloons or ground-based sensors
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Astronomy enthusiasts, amateur stargazers, and anyone interested in understanding the effects of atmospheric conditions on celestial observations.

Liger20
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Hello, several nights ago I was outside looking at the sky. I noticed this strange looking star near the horizon, and I swear to you, it kept flashing from red to blue and back. I vaguely remember reading something about this, but I don't quite remember what it was.
 
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Atmospheric distortion causes the light to spread out into its various colors. Bad seeing close to the horizon that night.
 

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