Large-scale structure

a declination slice · right ascension against redshift

Redshift stands in for distance, so a thin slice of sky opened out into a wedge shows the Universe in depth. The clumps, threads and empty rounds you see are not an artist's impression of the cosmic web — they are the objects this register holds, one dot each.

The Sun sits at the centre; distance from it is redshift, and the angle is right ascension. Streaks pointing straight out are not structure — they are clusters of galaxies whose internal motions smear their redshifts, the classic 'fingers of God'. Drag to pan, scroll to zoom.

What you are looking at

Held with a redshift	710,866 objects out to z = 0.2
Slice	A band in declination, so the wedge stays thin enough for structure to survive the projection
Distance	Shown as z; the readout also gives cz/H₀ with H₀ = 70 km/s/Mpc, which is only a rough guide and breaks down at high redshift
Source	Redshifts as SIMBAD and NED publish them

Machine-readable: /api/v1/structure?dec=0&width=24&zmax=0.2 · every point is a record in the register, not a model.