Choice of Words:They refers to satellites. Collect means to gather information.
Alternative Expressions
They gather information.
Meaning: This means that they are finding out about something by getting facts and details.
Choice of Words:Gather means to bring things together in one place. Information refers to facts and knowledge. When you put them together, "They gather information" means that someone is collecting or bringing together pieces of knowledge.
They put together facts.
Meaning: This means that they are taking different bits of knowledge and putting them together to learn more about something.
Choice of Words:Put together means to combine or join different things. Facts are pieces of information that are true. When you put them together, "They put together facts" means that someone is combining different pieces of information to create a bigger picture.
They record details.
Meaning: This means that they are writing down or storing bits of knowledge so that they can remember them later.
Choice of Words:Record means to write or store information for future use. Details are small pieces of information. When you put them together, "They record details" means that someone is writing down or storing information for later use.