A telescope is an optical system which focuses light on a detector, measuring instruments, photographic plates, or the human eye. It enables us to see further out into the Universe and in greater detail. However, this tool does have its limitations.
After watching this video, you will be able to describe light, the basic working of a telescope and its limitations.
For more information: An optical instrument cannot see the entire electromagnetic spectrum simultaneously. It can only be adapted and optimised for a particular wavelength window. This is why astronomers have such a variety of telescopes.
In the “Space Mission” section of the Science tab on this site, we have examples of space telescopes optimised for different wavelengths. These instruments are used in the Exoplanets-A project. Some telescopes carry several instruments in order to observe astrophysical objects in a broader spectral range, which is the case with Hubble.
The ViewSpace site (in English) proposes displaying an everyday scene at different wavelengths, thus highlighting the importance of observation throughout the electromagnetic spectrum in order to obtain the maximum amount of information possible. The CoolCosmos site (in English) proposes in-depth teaching on infrared light, by means of everyday scenes, astrophysical objects, dedicated space missions, and even a history of the discovery and use of this light.