Most scientists know things about the universe due to detecting waves from objects in space.
Stars give out visible light which is why we can see them despite their distance from us.
We can see the plants because they reflect sunlight.
Early astronomers made observations using the naked eye.
Telescopes magnify images.
Telescopes on Earth have some issues which space telescopes can overcome - but they're expensive.
Telescopes can be used to take photographs of the universe, allowing 'zoom in'.
This makes it easier to share observations with others.
Faint objects can be seen by allowing a long exposure time so you can collect more light.
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