European bird eater wings

As you might know, to fly you have to catch lots of air under the wing (or at least a bit more than the amount above the wing) so that the air pressure is pushing you up and keeping you in the air. Well, when I saw a photo of a european bee eater, and it had an area in it's wing that did not have feathers.

So why is this gap here? Well one thought is that it might alow diferent parts of the wing to move up and down just like a planes flaps on it's wings. That would alow it too brake and use less energy when in flight.

Another thought is it might be like those flaps on parachutes. That would stop it's wings getting ripped of when it goes for a dive or goes at high speed. That way if the first and the second ideas are correct the european bee eater could go at alot higher speeds than other birds.

My last idea is that maby the bird was just born that way and it's not normal, the bird might have been attaked or hit a tree branch or last of all it wight be there to make it's wings wider.

Thank you.

european bee eater with gap

european bee eater with gap

european bee eater without gap

parachute

aironautics diagrame

Why do Galaxies form as a circle and not a sphere?

Most of the times when you look at a picture of a galaxy, you see it as a disc/circle thing with a bulge in the middle. Doesn't that seem a bit unnatural to you? Surely the galaxy's gravitational power would affect more then just a small section of the space around it. Right?

One idea I have which is very unlikely. It's that all the galaxies are pointing towards where the big bang occurred/the middle of the universe. The idea being that the big bang exploded and all the debris from the big bang flew of in lines/clumps flying in different directions. So when the gravity pulls all the matter together it forms a disc/circle instead of a sphere. And yes I know that is not logical but I'm just putting it out there.

An other idea which is a lot more likely is that some person has gone along and said these galaxies would look a lot nicer as a disc/circle and everyone has just gone along and copied that person.

The only problem about that idea is that I took a look at a map of our solar system and it looks like a disc/circle too. Apart from Pluto which orbits diagonally around the sun. So unless stars and black holes have an oddity that we don't know about in their gravitational pull, I'm not sure what is causing
this and it looks like we've stumbled across a new and unsolved mystery.

I also think that maybe the disc/circle shape is caused by dark matter pulling and shaping the galaxies and solar systems into a disc/circle shape.

Thank you for reading.

Our solar system

A galaxy

A different picture of a galaxy.

Why does a car wheel look like it's going backwards when at speed?

Why does a car wheel look like like it's going backwards when at speed? I'm not sure if another person has answered this, and they probably have. But still, I shall still share my theory with you.

Have you ever been driving down the freeway and you looked at an other car's wheel and it looked like it was going backwards? Well I have. And I have been thinking about it and now I think I know.

I expect that the car's wheel is traveling faster then we can process. I think instead of making us really really dizzy, I think we have found one group of scratches or marks looked for them again and again and again. Now whilst we're are looking for those marks the wheel is rotating. So when we find the marks the have done a rotation, but we are seeing it just before it passes the last spot we saw it. If that keeps on happening the marks will go further and further backwards.

 So that is why I think when we see a wheel going at speed, we think it is actually moving backwards.

Thank you and good bye. :)