The Milky Way began to form about 11.5 billion years earlier than Earth.
举一反三
- ____More than two billion people, or about one-fifth of the world's population, speak some form of Chinese as their first language.
- While ____ the sun, the satellite has sent more than four billion bits of information back to earth.
- The earth is big. The moon is small. About 50 moons equal to one earth. </p></p>
- According to the information given in Paragraph 5, we can conclude that the distance between the earth and the moon is approximately__________. A: 186,000 miles B: 372,000 miles C: 11 billion light years D: 2 billion light years
- How long did the Vietnam War last? A: More than 5 years B: About 10 years C: About 20 years D: More than 25 years