Answer
A black hole is invisible because its gravitational field is so strong that light cannot escape.
Work Step by Step
This is discussed on page 174.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 9 - Reading Check Questions (Comprehension) - Page 177: 29
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