2. What are the six main types of satellites?3. Why do you think weather satellites travel in low earth orbit?4. Why do weather satellites have to travel very fast?5. What is the mission of the satellite SOHO?6. Why are scientists using a space station to grow protein crystals and ...
根据短文内容,判断下列句子正(T)误(F)。( )1. Satellites move around the Earth.( )2. In satellites' family, there are many members.( )3. Satellites have the same job.( )4. Satellites see changes in clouds, oceans, land and ice. ...
The period of synchronous satellites is one day. The radius of the earth An orbiting satellite stays over a certain spot on the equator of (rotating) earth. What is the altitude of the orbit (called a geosynchronous orbit)? Communications satellites are placed in orbits so that they always ...
Satellites are objects in orbit around a planet. There are two different kinds of satellites: natural satellites and artificial satellites. Natural satellites mainly include moons, but can include large orbiting rocks, too (though most non-moons are usually pulled into the planet's atmosphere). Art...
B Have you ever heard of satellites(卫星)? What are they used for?Satellites are helping to forecast(预报) the weather now. They are in space, and they can reach any part of the world. The satellites take pictures of the atmosphere,where the weather forms. They send these pictures to ...
There are several concerns regarding the increasing number of satellites in space. One major concern is the growing risk of collisions, which could create a large amount of space debris. This debris could then collide with other satellites, creating a chain reaction known as the Kessler Syndrome,...
There are two kinds of satellites: natural (such as the moon orbiting the Earth) or artificial (such as the International Space Station orbiting the Earth). There are dozens upon dozens of natural satellites in the solar system, with almost every planet having at least one moon. Saturn, for...
A satellite is any object that orbits something else, as, for example, the Earth orbits the sun. There are hundreds of satellites in operation. They are used for diverse purposes such as weather forecasting, television Signal, amateur radio and internet communications and theGlobal Positioning Syst...
Planet Earth is made up of four overlapping subsystems that contain all of world’s land masses, water sources, living organisms, and gases. These four subsystems are known as spheres. Geographers break down the Earth’s systems into four spheres that make up the world’s air (atmosphere),...
A 4What types of animals are in the ocean?How many are there? Oceanographers studied and counted animals for ten years to discover the answers. They looked at all the world's oceans from the North Pole to the South Pole.They counted more than 30,000 species in more than 30 million ...