Science for Kids/Spacecraft Question

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Question
How is information about distant galaxies (photos, etc) transferred from the probe (telescope; spacecraft; etc) to Earth and vice versa?

Answer
Via radio.  The satellite sends a modulated radio signal to the earth, which is called the downlink.  The earth control station sends a modulated radio signal to the spacecraft with instructions, this is called the uplink.

Here's a link to Wikipedia for uplink and downlink

http://en.wikipedia.org/wiki/Uplink#Uplink  

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Sue Kayton

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I can answer almost any student science question! I especially like ones involving silkworms, spacecraft and computers.

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MIT graduate. Have worked as an engineer and taught science for 28 years.

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