We have retold 2 papers by this author. 1 of them with a full read. most often about: expansion of the universe, topological defect, quintessence. 6 co-authors across our retellings.
Two rulers show slightly different lengths for the same table. That's roughly the situation in cosmology with the Hubble constant — the number that tells how fast the universe is expanding.
37 pairs of galaxies of different ages served as clocks. Their hands, the difference in stellar ages, told how fast the Universe expanded at different epochs. Based on these readings, cosmologists built a lie detector for dark energy.