Answer
The objects around us at room temperature radiate mostly in the infrared region of the spectrum, which our eyes are not sensitive to, so the room appears dark. They radiate very little in the visible spectrum.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 16 - Think and Explain - Page 317-318: 72
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