{"id":7799,"date":"2026-04-21T09:29:11","date_gmt":"2026-04-21T16:29:11","guid":{"rendered":"https:\/\/cosmologyscience.com\/cosblog\/?p=7799"},"modified":"2026-05-20T21:20:11","modified_gmt":"2026-05-21T04:20:11","slug":"largest-universe-3d-map-measuring-distances-to-47-million-galaxies-but-desi-uses-a-flawed-method","status":"publish","type":"post","link":"https:\/\/cosmologyscience.com\/cosblog\/largest-universe-3d-map-measuring-distances-to-47-million-galaxies-but-desi-uses-a-flawed-method\/","title":{"rendered":"Largest Universe 3D Map measuring distances to 47 Million Galaxies – But DESI uses a Flawed Method"},"content":{"rendered":"

DESI (Dark Energy Spectroscopic Instrument)<\/a> has just finished measuring redshifts of some 47 million galaxies<\/a>. That’s Breathtaking !<\/p>\n

Analyzed results are expected to start showing up by 2027.<\/p>\n

\"Redshift<\/a>

Spectral-Line Redshift<\/strong> shown with Light spectrum Movement<\/p><\/div>\n

Sadly, these are not real (meaning flawlessly accurate) Redshifts, where the emission spikes and absorption lines move called “Spectral Line Redshift.<\/a>”<\/p>\n

Instead DESI is using a questionable substitute or alternative called Photometric Analysis<\/a> which only measures colors – not emission or absorption lines. Photometric Analysis’s accuracy is described as “Low to moderate<\/a>” because it has significant systematic and statistical problems. Primarily is how many independent combinations of galaxy properties, redshift and spectral type<\/strong> (the intrinsic shape of a galaxy’s energy spectrum) can produce identical or indistinguishable broad-band colors.<\/strong><\/p>\n

Well, Drats !<\/p>\n

This does not mean DESI’s data is useless. But it does mean that any explanations based on their data being accurate must be independently verified.<\/p>\n","protected":false},"excerpt":{"rendered":"

DESI (Dark Energy Spectroscopic Instrument) has just finished measuring redshifts of some 47 million galaxies. That’s Breathtaking ! Analyzed results are expected to start showing up by 2027. Sadly, these are not real (meaning flawlessly accurate) Redshifts, where the emission … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":2,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[13],"tags":[],"class_list":["post-7799","post","type-post","status-publish","format-standard","hentry","category-basic-science"],"_links":{"self":[{"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/posts\/7799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/comments?post=7799"}],"version-history":[{"count":12,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/posts\/7799\/revisions"}],"predecessor-version":[{"id":7840,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/posts\/7799\/revisions\/7840"}],"wp:attachment":[{"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/media?parent=7799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/categories?post=7799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cosmologyscience.com\/cosblog\/wp-json\/wp\/v2\/tags?post=7799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}