A Journey into a Galaxy Collision

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1. Q:
   Hydrogen doesn't exist since the Bigbang,
   but is a product of evolution of
   the universe?
   Before there were visible stars,
   there already were "dark planets and stars?"
   
   In the universe exist many
   "dark planets and stars"
   possibly older than visible stars?
2. How lame that we'll become an ugly elliptical.
3. CALLED THE MILKDROMEDA!!!
4. I estimated that there'll be about one stellar collision per 60 billion stars (in both galaxies); however the stability of planetary systems is a different matter. A star with an extensive family of planets has about 1 chance in 300 that the orbits of its outer planets will be disrupted by a passing star during a galaxy collision.
5. While the Milky Way and the Andromeda Galaxy are at a distance large compared with their physical dimensions, it should be a good enough approximation to treat the galaxies as point masses. I'll calculate the time to fall from where the galaxies are now until they are only 100,000 light years apart.
   
   Gravitational parameters.
   GM₁ = 1.12805748522e+32 m³ sec⁻²
   GM₂ = 1.9906896798e+32 m³ sec⁻²
   GM = GM₁ + GM₂
   GM = 3.11874716502e+32 m³ sec⁻²
   
   Separation at time t₁,
   r₁ = 2.40019e+22 m
   
   Radial speed at time t₁,
   v₁ = −1.1e+05 m/s
   
   Distance of zero relative speed,
   d = [1/r₁ − v₁²/(2GM)]⁻¹
   d = 4.4914443e+22 m
   
   Time to fall from d to r₁,
   t₁−t₀ = ∫(r₁,d) [2GM(1/r−1/d)]⁻⁰·⁵ ∂r
   t₁−t₀ = √[d/(2GM)]{√(r₁d−r₁²) + d arctan[√(d/r₁−1)]}
   t₁−t₀ = 4.763353436e+17 sec
   
   Separation when the galaxies begin to interact,
   r₂ = 9.46073e+20 m
   
   Radial speed at time t₂,
   v₂ = √[2GM(1/r₂ − 1/d)]
   v₂ = 803378 m/s
   
   Time to fall from d to r₂,
   t₂−t₀ = ∫(r₂,d) [2GM(1/r−1/d)]⁻⁰·⁵ ∂r
   t₂−t₀ = √[d/(2GM)]{√(r₂d−r₂²) + d arctan[√(d/r₂−1)]}
   t₂−t₀ = 5.978969894e+17 sec
   
   Time to fall from r₁ to r₂,
   t₂−t₁ = (t₂−t₀)−(t₁−t₀)
   t₂−t₁ = 1.215616458e+17 sec
   t₂−t₁ = 3.8520561e+9 years
6. Amazing animation.
7. Q:
   There are colliding galaxies,
   galaxies that move away from each other,
   and galaxies that are in a standstill
   to each other?
   Or not?
8. The vastness of space never fails to awe me no matter how many times I think about it. The face that 2 galaxies can merge with very very very minimal collisions of stars just attest to this. People just don't understand just how vast the universe truly is, including myself of course.
   
   I like to belief I have a better understanding and conception of it than most people who don't spend hours upon hours trying to imagine it like I do but even then I think I may just be fooling myself. I mean, a millions A LOT. A 100 million even more ridiculous. Then you have a billion which is absurd. A 100 billion which is even mind shattering. Then to think of a TRILLION. It's so unfathomable the even comprehending how unfathomable it is unfathomable. Now, to think there is over 100billion galaxies all containing billions or trillions of stars which are staggeringly larger than earth itself. Now think of just how big even earth it. How but continents, countries, even states are. Just wow.
9. The visuals are amazing! How do you get the images you use for these videos?
10. you really made my day, oh sorry i meant night
11. Really nice vid... except that that view won't really be visible from here as we'll be gone or dead in 5 billion years from the suns death lol
12. @ 3 billion years ... where in the milky way will our star be --- are we being sucked toward the center ... or flung away out here on the edge
13. Question: Are binary-stars the result of colliding galaxies?
14. Kerbal Space Programm music, its so magical.
15. Even if our race survives the death of the Sun and Earth, and we have traveled to another system; could we survive a galaxy collision? Would our new star or planet get thrown out of orbit into nothingness?
16. this is amazing... the way I see the space is the way as you were born into an isolated island an only had the ocean to watch on the horizon.. I wonder myself everyday what is on the other side
17. Was the narrator MAX from flight of the navigator?
18. Would the stars be the same?  I mean wouldn't all of the stars that we see today be burnt out in both galaxies?  Is the Milky Way and Andromeda producing enough stars to provide these beautiful views 7,000,000,000 years from now?
19. I'm aware that the night sky images here have increased brightness for ease of viewing, but I am very curious about something:
    
    Could a bright galactic core provide a planet without a proper sun with enough light for it to have a possibility of sustaining Earth-like life?
20. this guys voice is relaxing its almost therapeutic