the questions. (1.0 pt)
Most scientists believe that for another planet to have life on it, it must be sum
is likely to need an atmosphere (air) and water. It also must orbit a star, like the Sun, at a good distance. This
star would provide the right amount of light and heat for life to exist.
Scientists have studied planets and moons in our solar system to see if they can support life. Space probes
have searched for traces of bacteria or other tiny living things on Mars. Some scientists are also looking for
the possibility of life outside our solar system. Using radio telescopes, they hope to capture signals from
intelligent aliens.
So far, no evidence of extraterrestrial life has been found. However, scientists have discovered hundreds of
planets that orbit distant stars. Some of these planets are an ideal distance from their stars, and some are
roughly the size of Earth. It may be possible that life has developed on one or more of them.
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1. The best title for the passage could be
A. "The Search for Alien Life."
Planet."
C. "A Promising Planet Supporting Life."
B. "The Search for a New
D. "Evidence of Life on other Planets."
B. exactly the same Earth
D. at a good distance from Earth
2. Most scientists believe that a life supporting planet must be
A. somewhat similar to Earth
C. in our solar systems
3. The phrase "Space probes" most likely means.......
A. "vehicles that travel in space, carrying spacecraft.
B. "spacecraft that collect information about the conditions of the Sun.
C. "vehicles that travel in space, carrying people."
D. "spacecraft without people on them that collect information about a planet."
4. The scientists use radio telescopes in order to
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