Dark matter，sometimes called “cold dark matter”，has been known for some time. Only recently have researchers come to understand the key role it played in the formation of stars，planets and even people.

　　“We owe our very existence to dark matter，” said physicist Paul Steinhardt. “Dark matter dominated the structure formation in the early universe，” Steinhardt said. “For the first few billion years dark matter contained most of the mass of the universe. You can think of ordinary matter as a froth(泡沫状物) of an ocean of dark matter. The dark matter dumps and the ordinary matter falls into it. That led to the formation of the stars and galaxies(星系). Without dark matter，there would be virtually no structure in the universe.”

　　The nature of dark matter is unknown. It cannot be seen or detected directly. Astronomers know it is there because of its effects on celestial(天上的) objects that can be seen and measured. But the most dominating force of all in the universe is called dark energy, a recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.

　　6．We know from the text that ________.

　　A．all visible stars are very important in the universe

　　B．the basic understanding of the universe evolution was totally wrong

　　C．dark matter is also known as dark energy

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