![]() ![]() Because wavelengths in the electromagnetic spectrum are so fine, these tools allow us to quantify the amount of light as it moves. ![]() In space exploration, NASA uses remote-sensing tools that are capable of seeing deeper into the electromagnetic spectrum than we can with our eyes. The image on the right was colorized to show details not visible to the naked eye in natural light. These images captured by NASA's Cassini spacecraft of Saturn's moon Enceladus show plumes shooting out from the moon's south pole. For example, using remote sensing we’re able to detect the jets of water shooting out from Saturn’s moon Enceladus nearly 900 million miles away. When we look out into the solar system and beyond, we use remote sensing to see things far beyond what we can see with our naked eye. But what we can see with the naked eye only tells us part of the story. ![]() These images are one kind of remote-sensing measurement. Remote sensing refers to making measurements without directly touching the object being measured. NASA scientists often use a technique called “remote sensing” to study the composition of different elements and structures on planets. Wear gardening gloves for additional safety. This can be done safely by placing the disc between a book and the edge of a table and breaking the CD along the straight line to ensure a clean break.
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