Mercury's sunlight is very bright because it is closest to the sun.
Dim
bright
it has bright
bright
Because of its distance from the Sun, it has dim sunlight.
Mercury's bright sunlight is due to its close proximity to the Sun, which allows it to receive intense sunlight that is reflected off its surface. Additionally, Mercury's lack of a significant atmosphere means that there is no scattering of light to diminish its brightness.
Perhaps the part of the headlight bulb has burned out.
the words bright and dim are antonyms because they are opposites
The word opposite to the word dim is bright.
Dim.
If you're talking about a gender difference, then the opposite is a bright girl. Otherwise the opposite of 'bright boy' is 'dull boy'