HELP ASAP PLEASE Why does the author include this description?
Read this excerpt from A Black Hole Is NOT a Hole.
One of the best black-hole clues is X-ray energy. As
matter approaches an event horizon, its atoms "shine"
with invisible X-rays. Although our eyes can't see the X-
rays, we can make detectors that respond to their
tremendous energy.
X-ray-catching telescopes make pictures of otherwise
invisible X-rays. The pictures reveal that certain areas
in outer space are emitting intense X-rays. Each bright
location points out where something extraordinary is
going on. It is a hint that a black hole might be there.
O to explain why humans cannot see X-rays
O to explain how X-rays help scientists study space
O to explain that black holes are extraordinary
O to explain where black holes are located