Thousands of satellites fly overhead every day, helping us with things like weather forecasts, scientific research, communications, TV broadcasts (and maybe some surreptitious spying). How much do you know about these eyes in the sky?
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北斗卫星导航系统Nowadays, we are used to using our phones to get our location. But how do our phones know where we are in the world and in which direction we are going? It is all thanks to the satellites in space that help our phones calculate our position.Depending on where you are ...
Finally, it's possible to think about satellites in terms of where they're "looking." Most of the objects sent into space over the last few decades look down at Earth. These satellites have cameras and equipment capable of seeing our world through various wavelengths of light, making it pos...
It takes Ariane less than an hour to put two satellites into space:Liftoff: At liftoff, the rocket weighs up to 780 tonnes (as much as about 500 cars), of which the payload represents 10 tonnes at most. In other words, the cargo represents just 1 percent of the total weight! To put...
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Auroras shine behind the International Space Station, backdropped by a docked Russian Soyuz spacecraft. Also visible as a bright light is the moon and the curved Earth.(Image credit: Matthew Dominick/NASA/X) Thousands of photos of Earth taken by satellites and astronauts confirm our planet's ...
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How do we find our way?A. Most modern navigation, such as the Global Positioning System (GPS), relies primarily on positions determined electronically by receivers collecting information from satellites. Yet if the satellite service’s digital maps become even slightly outdated, we can become lost...
The receiver then usestrilaterationto determine your exact location. Basically, it draws a sphere around each of three satellites it can locate. These three spheres intersect in two points -- one is in space, and one is on the ground. The point on the ground at which the three spheres int...