Satellite observation of our planet can be used for good and for ill. We explore a range of applications.
It's one planet, a mega-constellation of satellites, one web. Like internet for everyone, anywhere. Sounds great. Right?
In 60 years of space exploration, we've placed almost 7,000 satellites in orbit. Less than a third still function. The rest is dangerous junk - and their number is growing. Here's how we might mitigate the threat.
"Why build one when you can have two at twice the price?" So goes the famous line (and government potshot) in the sci-fi film "Contact." But sometimes, having two of something in space is far, far better than one.
Climate change is a global threat. So where to get the best perspective on the problem? Space! Scientists are monitoring Earth with satellites and running experiments in zero gravity to help save our fragile planet.
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