--- title: Rockets, satellites and astronauts — a lesson of Mova's school · trees and pragmatics description: «Rockets, satellites and astronauts», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A rocket works like a balloon let go: it throws hot gas out of its tail very hard, and the gas pushes the rocket the other way. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Rockets, satellites and astronauts # Rockets, satellites and astronauts Lesson 71 of the world course of Mova's primary school: 21 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/71-rockets-satellites-astronauts/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/0/) — A rocket works like a balloon let go: it throws hot gas out of its tail very hard, and the gas pushes the rocket the other way. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/1/) — It needs no air to push against, so it works in empty space too. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/2/) — Fuel needs oxygen to burn, and there is no air in space, so a rocket carries its own oxygen as well as its fuel. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/3/) — Big rockets are built in stages, and each empty stage drops away to make the rocket lighter. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/4/) — A satellite stays up because it moves sideways very fast, about 8 kilometres every second; it keeps falling towards the Earth, but the curved ground falls away beneath it just as fast, so it falls around the Earth forever. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/5/) — This path is called an orbit. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/6/) — Satellites forecast the weather, carry phone calls and television, help us find our way and photograph the land; the International Space Station is a large satellite where astronauts live and work about 400 kilometres up. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/7/) — For example, the space station goes around the Earth about every 90 minutes, so the astronauts on board see about 16 sunrises and 16 sunsets every day. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/8/) — A rocket pushes hot gas backwards, and the gas pushes the rocket forwards. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/9/) — A rocket carries its own oxygen because there is no air in space. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/10/) — A jet plane's engines burn their fuel with oxygen from the air around them, so a plane cannot fly in space. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/11/) — Big rockets drop their empty stages to become lighter. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/12/) — A satellite in orbit is falling around the Earth while it moves sideways very fast. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/13/) — The first satellite, Sputnik 1, was launched in 1957. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/14/) — Yuri Gagarin became the first person in space in 1961. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/15/) — Neil Armstrong and Buzz Aldrin walked on the Moon in 1969. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/16/) — The International Space Station circles the Earth about every 90 minutes, about 400 kilometres up. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/17/) — Satellites are used for weather forecasts, phone calls, television, maps and finding the way. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/18/) — A satellite about 36,000 kilometres up goes around once a day and stays above the same spot on the Earth. - [19](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/19/) — A spacesuit gives an astronaut air, the right pressure and protection from heat and cold. - [20](https://md.mova.elamur.ai/free/en/corpora/school/world/71-rockets-satellites-astronauts/20/) — Astronauts' muscles and bones weaken in space, so they exercise about two hours every day. - ← previous: [Stars, planets and constellations in the night sky](https://md.mova.elamur.ai/free/en/corpora/school/world/70-the-night-sky/) - next →: [Insects and spiders](https://md.mova.elamur.ai/free/en/corpora/school/world/72-insects-and-spiders/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)