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Reading comprehension -TOEFL- Lesson 147 (Đọc hiểu -TOEFL- Lesson 147)

Reading and answers the question: A binary star is actually a pair of stars that are held together by
the force of gravity. Although occasionally the individual stars
that compose a binary star can be distinguished, they generally appear
as one star. The gravitational pull between the individual stars
5 of a binary star causes one to orbit around the other.
From the orbital pattern of a binary, the mass of its stars can be
determined: the gravitational pull of a star is in direct proportion
to its mass, and the strength of the gravitational force of one star
on another determines the orbital pattern of the binary. Scientists
10 have discovered stars that seem to orbit around an empty space. It
has been suggested that such a star and the empty space really compose
a binary star. The empty space is known as a black hole, a star with
such a strong gravitational force that no light is able to get through.1. A binary star could best be described as

2. According to the passage, what happens as a result of the gravitational force between the stars?

3. According to the passage, what can scientists learn from the pattern of a binary star's orbit?

4. According to the passage, what is a black hole?

5. According to the passage, what is a black hole?

6. This passage would most likely be assigned reading in a course on

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