Outdoor Solar Lights

The reason is that…
(a) relative to their stars, planets are brighter in the infrared than in visible light.
(b) the longer the wavelength used, the better the angular resolution of a telescope with a fixed aperture size.
(c) because of the properties of their atmospheres, planets reflect more infrared light than visible light.

Stars give off most of their energy as visible light, whereas planets emit most of their energy in the infrared region of the spectrum. Therefore, relative to their stars, planets are brighter in the infrared than in visible light and so the correct answer is (a).

Related posts:

1. why does green light no give me a good power output for a solar panel compared to red and blue?
2. do colored light filters give you a single wavelength range?
3. How do we know if any form of life is active on extra-solar planet?
4. How do we know if any form of life is active on extra-solar planet?
5. To image an extra-solar planet as a point of light, the best wavelength range to use is the infrared…?

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