Sci Fi TV science or fiction?

OK in that sense I agree, but you can't 'hit any matter in the way through the wormhole' since by definition the distance between the two mouths of the wormhole is zero. There is no space in between the two mouths so where there's no space there can't be any matter.

Okay, we will continue to contradict each other.

 

There is a very low probability that any one specific star would collide with any of the 1 trillion stars of the approaching galaxy, however there is a very high probability¹ that any one of the 300 billion stars would collide with any one of the 1 trillion stars of the approaching galaxy. Why is this high? Because stellar collisions are not rare events on a cosmological timescale. In our Milky Way galaxy stellar collisions occur once every 10,000 years. Got that? In a "static" galaxy where stars are separated by light-years, a star will collide with another star at some time in a 10,000 year window. This is because the density of the galaxy is not constant and the velocities and trajectories of the stars within it are not uniform. Even Sol and Proxima Centauri, which are located in a low density part of the outer spiral arm (the Orion Arm) that is orbiting the galactic centre at 200 km/s, are not moving at exactly the same velocity on exactly the same trajectory. In the time it takes Andromeda to collide with the Milky way there would have been 400,000 stellar collisions within our galaxy alone - it is safe to assume a greater number will have occurred in the Andromeda galaxy. So introduce another 1 trillion stars into that same volume of space and the number and frequency of those collisions will increase - it cannot decrease, so therefore there is a high probability that one of those stellar collisions will be between stars from each galaxy, I expect that the probability is so close to 1 that it is an inevitability. Also, even though (as I said) stars are unable to take evasive action to avoid a collision, gravitational attraction means they are inclined to do the opposite - if they get close enough to collide, they will collide.

 

This is not a wild guess based upon assumed densities (little stars far apart) but a reasonable prediction based upon what is happening now.

 

[¹if you write your name on a piece of paper and put it into a hat with nine other names then the probability that in a single draw your name will be picked is 0.1, however, the probability that someone's name will be picked it exactly 1]

 

And this is just taking stellar collisions into account. On smaller scales celestial collisions of non-stellar objects is even more common.

 

 

Also. The current explanations assume that the galaxies will mesh perfectly (because stars are small and the distance between them is great), but there is nothing to suggest that would be the case.

 

I never said that celestial bodies will never eventually collide. Gravitational attraction is likely to cause a lighter body to eventually fall into a heavier body. But we have been orbiting the Sun for quite a while and we did not yet fall into it. That takes a little while.

I said that if two galaxies 'collide', head to head collisions between their constituent stars are extremely unlikely, they will just pass through each other and gravitational effects will alter their structure, but body-to-body collisions will still be extremely unlikely, and I guess that the articles I provided support this claim.

Wikipedia is not a supportive article - I have given extensive explanation as to  why I believe those articles are not the definitive answer. All you have done is contradicted me.

Astronomers and Cosmologists are not so naive as to neglect that there must be invisible bodies made of baryonic matter floating around that we can't see.

Dark matter considerations arise more from the Big Bang models, which can not explain how so much ordinary matter as it seems it would be needed to produce the gravitational effects we observe could have been produced by the Big Bang, as well as why does that 'dark matter' not interact with ordinary matter neither electomagnetically, nor via weak force or via strong force, apparently it only interacts gravitationally. That's what makes it 'dark matter', not the fact that it does not emit or reflect light.

Misunderstanding cleared.

 

Light is an electromagnetic wave (EM wave), it behaves like a wave and it behaves like a particle, but it is still an electromagnetic wave so when you Doppler shift it it behaves like a wave and does all the things a wave can do. Doppler shifting at approaching light-speeds causes the EM wave to shift out of the visible portion of the spectrum - whether you have eyes or not, you cannot see it once that happens. The energy that a photon has is proportional to the frequecy of the EM wave - gamma rays have lots of energy, radio waves have not so much. [edit: my train of thought stopped here.. what I intended to say was as you Doppler shift the lightwaves the energy of the photon is increased or decreased depending on the direction of the shift]

 

 

 

 

As you approach the speed of light the light reflected off objects behind you will be stretched from optical wavelengths down into non-visible wavelengths. You will see nothing, but you could still detect them with suitable detectors - travelling at 99.9999% the speed of light you would be able receive 'light' from an object you are moving away from on a domestic radio receiver. The Doppler formula is very simple:

 

 

 

is the velocity of waves in the medium;

is the velocity of the receiver relative to the medium; positive if the receiver is moving towards the source (and negative in the other direction);

If  =  then the formula will yield f=2fo for light coming from the object you are moving towards and f=0 for objects you are moving away from. So if you were travelling at precisely the speed of light then the light reflected off objects behind you will be travelling at the same speed and will never reach you, light coming from objects in front of you will be compressed and shift up into the ultraviolet spectrum. Looking back all you would see would be total darkness (and here I mean absolute darkness - a black so black it would scare the crap out of an Goth) because it is not just the optical region of the spectrum that has been shifted to zero, all EM frequencies (radio, radar, microwaves, infrared, visible light, ultarviolet, x-rays, gamma ray) have been shifted to zero. However, looking forward you will see something because in that direction all the infrared frequencies will have been shifted into the optical region of the spectrum, you will see the heat profiles of objects. [This is an effect that many text books fail to mention].

 

So hyperthetically, if it were possible to travel faster than light what would happen would be that the lower EM frequecies would continue to be doppler shifted up the spectrum - visible light would shift through the ultraviolet into x and gamma rays (which is not a good thing for the observer) and lower frequencies such as heat and radio waves would be shifted into the visible region. We would see the Universe as a radio telescope sees it.

 

What we would not see would be the future, no matter how fast we travel we can only see things that have happened. We can only see a photon of EM radiation after it has left the source - the faster we go the sooner we see it but we will never see it before it has happened: