No.
No, because the winds will get weaker.
No, light does not always travel at the same speed in all mediums. Its speed can vary depending on the medium it is passing through.
826 limit
No, waves do not always move at the same speed. The speed of a wave depends on the medium through which it is traveling. For example, sound waves travel at different speeds in air, water, and solids.
The speed of light is always the same.
The speed of an electromagnetic wave is always the same, regardless of its frequency and amplitude. It travels at the speed of light in a vacuum, which is approximately 3.0 x 10^8 meters per second.
No. The wind speed of the jet stream is constantly changing and varies at different points along it. The winds are generally fastest in the winter.
Permanent winds are winds that pretty much always blow, and blow in the same direction. Periodic winds are that are somehow tied to the seasons. Like in spring it's generally northerly and in autumn it's generally southerly. Or something along those lines.
Venus is exactly the same size as Venus.
The speed of light is always the same as long as it's traveling through the same medium. But its speed is different in different media, and those are all less than its speed in vacuum.
Yes. The moon is tidally locked to the earth, so that whether the moon is new, waxing, full, or waning, we always see the same side.
Yes. The problem is that when it is it's on the far side of the Sun from us. Since the orbital plane of Venus is not exactly coplanar with the orbital plane of Earth, the Sun isn't always "in the way" at such times, but it is always in the sky at the same time, with its much brighter light drowning out the faint light of Venus.