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Physics/information using light

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Question
Hi,

How spacecraft tramit the photo captured to earth. Is it through radio waves or through light? How information can be transmitted using light? How is the loss of information avoided during transmission using light? Please explain

Answer
Spacecraft communicate using radio waves, which are a form of light.  Information can be transmitted over fiber optic cables using light by pulsing it, forming a digital signal.  I'm not sure what you mean by losing information when using "light," or if you're aware that radio waves are indeed light (not in the visible portion of the spectrum).

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Experience

I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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