4 ms·
Imagine you are an Earth-level (0.7 on Kardashev's scale) civilisation on the path of this monster. In fact, let's just imagine it were to happen in the Milky
by alnitak 10y ago
Imagine you are an Earth-level (0.7 on Kardashev's scale) civilisation on the path of this monster.
In fact, let's just imagine it were to happen in the Milky Way. What happens to us then?
- deleted 10y ago[deleted]
- tonmoy 10y agoSeems like a VERY VERY low possibility. Even in case of two galaxies colliding, with 100s of billions of stars coming close to each other, the individual stars would barely feel a thing. http://curious.astro.cornell.edu/about-us/96-the-universe/galaxies/formation-and-evolution/530-what-happens-when-galaxies-collide-beginner http://curious.astro.cornell.edu/about-us/96-the-universe/ga...
- flashman 10y ago(Napkin math time.) A black hole with 1 billion solar masses would pull Earth with a force equal to the Sun from half a light year away. It does the same thing to Uranus from a distance of 9.6 light years. It would have enough influence to disturb those orbits from much further away. So if something similar entered our galactic neighbourhood, we would notice changes in the proper motion of stars closer to it, discrepancies between the planets' predicted and actual positions, and (possibly before anything else) predictable errors in GPS timing (since this is probably the most commonly-encountered system depending on accurate knowledge of speed, time and gravity).
- grigjd3 10y agoWhile the point you are aiming for is correct, your "napkin math" is wrong and ignores the equivalence principle.
- AnimalMuppet 10y agoA correction is more informative than just a bare statement that something is wrong...
- flashman 10y agoCan you either fix it or explain why it's wrong?