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GCSE Physics · key term
An instrument that collects electromagnetic radiation from a distant object so it can be detected or imaged.
Used by Edexcel
Specification 7.19P · Paper 1
Revise: Observing the UniverseAstronomical telescopes, developed in the early seventeenth century, collected more light than the eye. Astronomers could then see features of the Moon and planets and use their observations to test ideas about the Solar System. Over time, larger instruments and improved detectors made it possible to study much fainter objects.
If asked why a telescope is in space, link the particular observation to atmospheric absorption or distortion. ‘It is closer to the stars’ is not a useful explanation.
Distinguish a clearer image from detecting a new wavelength. Space telescopes can do both, but for different reasons.
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