----- Nội dung ảnh ----- 1. Complete the sentences with the words or phrases in the box. planet traces Solar system weightless flying saucer space buggy aliens outer space astronaut
1. A ______________ is sometimes referred to as an Unidentified Flying Object (UFO). 2. An ______________ is a person who is trained for travelling in a spacecraft. 3. Researchers made the amazing findings of ______________ of water on Mars. 4. Our ______________ is a vehicle used for driving on the Moon. 5. Our ______________ is made up of the Sun and all the objects that travel around it. 6. Earth is the only ______________ known to be habitable. 7. Do you believe ______________ exist on other planets? 8. Spacecraft are vehicles used for travel in ______________. 9. Our ______________, the Milky Way, consists of 100 - 400 billion stars. 10. Astronauts on the orbiting space station are ______________ because they do not experience a force of gravity.
II. Choose the correct answers to complete the sentences. 1. A(n) ______________ is a scientist who studies the stars and planets.
