How much in the past do we see these planets?

  • #1
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Summary:

This infrared image shows planets that are orbiting a star called HR 8799, since these are thermal emissions does it still mean planets here that we see are 129 years in the past?

Main Question or Discussion Point

The HR 8799 star is 129 light-years away from us, in this image we can see thermal emissions coming from these planets. Do these emissions move at the speed of light? If so does it mean that what we are seeing in this image is how the planets looked like in infrared 129 years in the past?
 

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Answers and Replies

  • #2
Ibix
Science Advisor
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Infrared is electromagnetic radiation, just like visible light (it just has a different wavelength), so yes and yes.
 
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Thank you!
 

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