query: Why do galaxies collide? Reconciling dark energy and an expanding universe with the fact that some galaxies are on a collision course
positive_passages.docid: 16759
positive_passages.text: How and why will the Milky Way collide with the Andromeda galaxy?
negative_passages.docid: 114934
negative_passages.text: Bootstrap Paradox in Interstellar
negative_passages.docid: 129816
negative_passages.text: Experimental observation of matter/antimatter in the universe
negative_passages.docid: 112264
negative_passages.text: Cosmological constant doubts
negative_passages.docid: 15806
negative_passages.text: $N$-body simulation in General Relativity
negative_passages.docid: 107971
negative_passages.text: Hubble's law and conservation of energy
negative_passages.docid: 126980
negative_passages.text: What happens at the interface between two universes with opposite thermodynamic arrows of time?
negative_passages.docid: 145327
negative_passages.text: Why is "gravitational" red-shift neglected in galaxy and galaxy cluster scales?
negative_passages.docid: 36974
negative_passages.text: References for cosmological perturbation theory in the ADM formalism
negative_passages.docid: 60364
negative_passages.text: Universe Expansion as an absolute time reference
negative_passages.docid: 46510
negative_passages.text: Relativity and Galaxy Rotation Speed
negative_passages.docid: 154529
negative_passages.text: Redshift and conformal time
negative_passages.docid: 7824
negative_passages.text: Particles reaching a singularity
negative_passages.docid: 107364
negative_passages.text: What are the differences between dark energy and a cosmological constant?
negative_passages.docid: 124006
negative_passages.text: Redshift of merging black holes
negative_passages.docid: 153929
negative_passages.text: White Hole Formation and Queries
negative_passages.docid: 47502
negative_passages.text: Newtons Cradle, Collision Theory