Curious about so many things in the universe ...


I do not know where to start:

- What is the momentum of galaxies in galactic collisions?

- How many starts are born per year in a typical galactic collision?

- What is the mass of a cloud dust necessary for star formation?

- How often does star formation happen in our galaxy?

- What are typical defelction angles in gravitational lensing?


Thanks for any information (that I did not find in Wikipedia...)

Heinz

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