Read this paragraph by the national aeronautics and space
administration (nasa) about black holes.
which question is answered by the paragraph?
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which nasa instruments are used to study black holes?
how much light exists inside black holes?
how strong is the gravity force of black holes?
how large in diameter are most black holes?
don't let the name fool you: a black hole is anything but
empty space. rather, it is a great amount of matter packed
into a very small area - think of a star ten times more
massive than the sun squeezed into a sphere approximately
the diameter of new york city. the result is a gravitational
field so powerful that nothing, not even light, can escape. in
recent years, nasa instruments have painted a new picture
of these strange objects that are, to many, the most
fascinating objects in space.