Equation 11 · Part 2 · From Origins to Frontier: A History of Precision Cosmology
subscript
subscript
What this part means
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
Its job in the formula
A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.
Full expression→subscript→Article meaning
The passage around this formula
The local, late-universe route to does not go through the CMB at all. It is built from a distance ladder: geometric parallax anchors the distance to nearby Cepheid variable stars, Cepheids calibrate the peak luminosity of Type Ia supernovae in the same host galaxies, and those calibrated supernovae are then used to measure distances — and thus the expansion rate — out to galaxies far enough that their recession velocity is dominated by cosmic expansion rather than local motion. The SH0ES team’s 2022 analysis, using Hubble Space Telescope observations of Cepheids in the hosts of forty-two Type Ia supernovae, reported a local of 73.04 ± 1.04 kilometers per second per megaparsec [ 7 ] .
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.