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I've heard there are satellites in space…

That is true. This site shows, how many are in there. Note, we are focused on satellites, facing Earth's surface, and monitoring various parameters of Earth's ecosystems. Here is a brief history of this kind of satellite. And another way around: here you can check landscape changes over time, captured by Landsat (starting in 1984! - actually, the first Landsat satellite was put into orbit in 1972, but this app contains data starting 1984) all over the globe, including Antarctica.

Now it is time for more in-depth reading. Be prepared for new terminology!

This article will give you a general understanding of technology, satellite types, and satellite imagery properties.

Alternatively, there is a selection of free self-paced mode courses to take:

• Sections 1A and 1B of Fundamentals of RS by NASA ARSET

• Land in Focus - Basics of Remote Sensing by ESA

• Fundamentals of RS by Planetek