query: How Do we Know How Old the Universe Is?
positive_passages.docid: 41750
positive_passages.text: The age of the universe
negative_passages.docid: 47082
negative_passages.text: If spacetime itself is expanding, how could we ever tell?
negative_passages.docid: 68282
negative_passages.text: How do people calculate proportions of dark matter, dark energy and baryonic matter of the universe?
negative_passages.docid: 5612
negative_passages.text: How to prove that we are living in a 3+1D world?
negative_passages.docid: 65566
negative_passages.text: Estimating age of the universe by Hubble's law?
negative_passages.docid: 26354
negative_passages.text: Is anti-matter matter going backwards in time?
negative_passages.docid: 41740
negative_passages.text: What is the evidence that dark energy exists? (as of 2020)
negative_passages.docid: 100760
negative_passages.text: How do we know that radioactive decay rates are constant over billions of years?
negative_passages.docid: 60364
negative_passages.text: Universe Expansion as an absolute time reference
negative_passages.docid: 21084
negative_passages.text: Size of the universe
negative_passages.docid: 154529
negative_passages.text: Redshift and conformal time
negative_passages.docid: 152335
negative_passages.text: Calculate distance of galaxy 13 billion years ago
negative_passages.docid: 50415
negative_passages.text: Value of the Hubble parameter over time
negative_passages.docid: 108910
negative_passages.text: Age of the universe $ \equiv 1/H$?
negative_passages.docid: 91403
negative_passages.text: Can you calculate unix timestamps (universal clock) from any planet?
negative_passages.docid: 81495
negative_passages.text: Does the universe have a different age to different observers?
negative_passages.docid: 55505
negative_passages.text: How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?