Đáp án `+` giải thích 

`1.` F

`-` Dẫn chứng `:` No one knows whether there is life elsewhere in the universe. But some scientists think that it is possible.

`2.` F

`-` Dẫn chứng `:` No one knows whether there is life elsewhere in the universe.

`3.` T

`-` Dẫn chứng `:` The word alien is a popular word for an extraterrestrial life-form, or a being from another planet.

`4.` T

`-` Dẫn chứng `:` Many people have reported seeing unusual objects in the sky. Some think that these UFOs are alien spaceships. The presence of aliens on Earth has never been proven, however.

`5.` T

`-` Dẫn chứng `:` Most scientists believe that for another planet to have life on it, it must be similar to Earth in several ways.

`6.` T

`-` Dẫn chứng `:` It is likely to need an atmosphere 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.

`7.` T

`-` Dẫn chứng `:` Scientists have studied planets and moons in our Solar System to see if they can support life... So far, no evidence of extraterrestrial life has been found.

`8.` T

`-` Dẫn chứng `:` 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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