--- title: "Meaning & Key Takeaway of: On the most usual assumption, the…" description: "\"On the most usual assumption, the universe is homogeneous on the large scale, i.e. down to regions containing each an appreciable number of nebulae. Th..." image: "https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg" --- # On the most usual assumption, the universe is homogeneous… ![“On the most usual assumption, the universe is homogeneous on the large scale, i.e. down to regions containing each an appreciable number of nebulae. The homogeneity assumption may then be put in the form: An observer situated in a nebula and moving with the nebula will observe the same properties…” quote by Hermann Bondi](https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg) [Download](https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg) [Open image](https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg) > “On the most usual assumption, the universe is homogeneous on the large scale, i.e. down to regions containing each an appreciable number of nebulae. The homogeneity assumption may then be put in the form: An observer situated in a nebula and moving with the nebula will observe the same properties of the universe as any other similarly situated observer at any time.” [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. The universe appears uniform when viewed at very large distances, meaning any observer in a galaxy sees the same overall properties as any other observer. **In simple terms:** Large‑scale uniformity means all observers see the same cosmos. Key Takeaway Assume uniformity when modeling cosmic structure. Themes cosmology uniformity large scale observation Mood analytical thoughtful Type scientific philosophical When to use this quote - galaxy surveys - cosmic microwave background analysis - large‑scale structure simulations Key Concepts cosmological principle statistical homogeneity Questions to Reflect On - How does assuming uniformity simplify calculations? - What evidence supports large‑scale homogeneity? A Different Perspective Local variations can break apparent uniformity in small regions. ★ ★ ★ ★ ★ No ratings yet [Assumption](https://sms4smile.com/quotes/about/assumption/) [Homogeneity](https://sms4smile.com/quotes/about/homogeneity/) [Nebula](https://sms4smile.com/quotes/about/nebula/) [Observation](https://sms4smile.com/quotes/about/observation/) [Property](https://sms4smile.com/quotes/about/property/) [Science](https://sms4smile.com/quotes/about/science/) [Universe](https://sms4smile.com/quotes/about/universe/) ## Related quotes > [The role of globalization is to homogenize all cultures, and to turn them into commodified markets, and therefore, to make them easier for global…](https://sms4smile.com/quotes/jerry-mander/the-role-of-globalization-is-to-homogenize-all-cultures-and-to-turn/) [Jerry Mander](https://sms4smile.com/quotes/author/jerry-mander/) > [ I am fairly optimistic about the disillusionment that produces homogeneity in general. The films that succeed in \[theaters\] are fairly homogeneous in terms of… ](https://sms4smile.com/quotes/lucrecia-martel/i-am-fairly-optimistic-about-the-disillusionment-that-produces/) [Lucrecia Martel](https://sms4smile.com/quotes/author/lucrecia-martel/) > [An observer situated in a nebula and moving with the nebula will observe the same properties of the universe as any other similarly situated…](https://sms4smile.com/quotes/hermann-bondi/an-observer-situated-in-a-nebula-and-moving-with-the-nebula-will/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [O.K. I'm running out of appetite. Let this swirl- a bit like Crab Nebula- do for now.](https://sms4smile.com/quotes/charles-olson/o-k-i-m-running-out-of-appetite-let-this-swirl-a-bit-like-crab-nebula/) [Charles Olson](https://sms4smile.com/quotes/author/charles-olson/) > [Without language, thought is a vague, uncharted nebula.](https://sms4smile.com/quotes/ferdinand-de-saussure/without-language-thought-is-a-vague-uncharted-nebula/) [Ferdinand de Saussure](https://sms4smile.com/quotes/author/ferdinand-de-saussure/) > [We begin with friendships, and all our youth is a reconnoitering and recruiting of the holy fraternity they shall combine for thesalvation of men.…](https://sms4smile.com/quotes/ralph-waldo-emerson/we-begin-with-friendships-and-all-our-youth-is-a-reconnoitering-and/) [Ralph Waldo Emerson](https://sms4smile.com/quotes/author/ralph-waldo-emerson/) > [A bit of mould is a pleiad of flowers; a nebula is an ant-hill of stars.](https://sms4smile.com/quotes/victor-hugo/a-bit-of-mould-is-a-pleiad-of-flowers-a-nebula-is-an-ant-hill-of-stars/) [Victor Hugo](https://sms4smile.com/quotes/author/victor-hugo/) > [“For a star to be born, there is one thing that must happen: a gaseous nebula must collapse. So collapse. Crumble. This is not…](https://sms4smile.com/quotes/n-l/for-a-star-to-be-born-there-is-one-thing-that-must-happen-a-gaseous/) N.l > [The truth about not having everything you need, not being fully equipped or qualified or allowed is that these limits are the nebula of…](https://sms4smile.com/quotes/augusten-burroughs/the-truth-about-not-having-everything-you-need-not-being-fully/) [Augusten Burroughs](https://sms4smile.com/quotes/author/augusten-burroughs/) > [Captain John Sheridan: I wish I had your faith in the universe. I just don't see it. Delenn: Then I will tell you a…](https://sms4smile.com/quotes/j-michael-straczynski/captain-john-sheridan-i-wish-i-had-your-faith-in-the-universe-i-just/) [J. Michael Straczynski](https://sms4smile.com/quotes/author/j-michael-straczynski/) > [“So I guess you could say Neel owes me a few favors, except that so many favors have passed between us now that they…](https://sms4smile.com/quotes/robin-sloan/so-i-guess-you-could-say-neel-owes-me-a-few-favors-except-that-so/) [Robin Sloan](https://sms4smile.com/quotes/author/robin-sloan/) > [The relationship between science and the humanities is two-way. Science changes our view of the world and our place in it. In the other…](https://sms4smile.com/quotes/alan-lightman/the-relationship-between-science-and-the-humanities-is-two-way/) [Alan Lightman](https://sms4smile.com/quotes/author/alan-lightman/) > [Nature goes to the same place to create a galaxy of stars: a cluster of nebulas, a rain forest, a human body, or a…](https://sms4smile.com/quotes/deepak-chopra/nature-goes-to-the-same-place-to-create-a-galaxy-of-stars-a-cluster/) [Deepak Chopra](https://sms4smile.com/quotes/author/deepak-chopra/) > [“La Nebuleuse is a poem of lovely & deep perspective, where, symboloized by artless beings, are seen the successive generations of men following each…](https://sms4smile.com/quotes/remy-de-gourmont/la-nebuleuse-is-a-poem-of-lovely-deep-perspective-where-symboloized/) [Remy de Gourmont](https://sms4smile.com/quotes/author/remy-de-gourmont/) > [“Subconsciously, we all want to be nebula... In the end, we’re all connected. We’re all going to become one cloud of light whether you…](https://sms4smile.com/quotes/jason-daniel-chaplin/subconsciously-we-all-want-to-be-nebula-in-the-end-we-re-all/) [Jason Daniel Chaplin](https://sms4smile.com/quotes/author/jason-daniel-chaplin/) ## More by Hermann Bondi > [An observer situated in a nebula and moving with the nebula will observe the same properties of the universe as any other similarly situated…](https://sms4smile.com/quotes/hermann-bondi/an-observer-situated-in-a-nebula-and-moving-with-the-nebula-will/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [Religion divides us, while it is our human characteristics that bind us to each other.](https://sms4smile.com/quotes/hermann-bondi/religion-divides-us-while-it-is-our-human-characteristics-that-bind/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [If you walk along the street you will encounter a number of scientific problems. Of these, about 80 per cent are insoluble, while 19½…](https://sms4smile.com/quotes/hermann-bondi/if-you-walk-along-the-street-you-will-encounter-a-number-of/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [What I remember most clearly was that when I put down a suggestion that seemed to me cogent and reasonable, Einstein did not in…](https://sms4smile.com/quotes/hermann-bondi/what-i-remember-most-clearly-was-that-when-i-put-down-a-suggestion/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [The true contrast between science and religion is that science unites the world and makes it possible for people of widely differing backgrounds to…](https://sms4smile.com/quotes/hermann-bondi/the-true-contrast-between-science-and-religion-is-that-science-unites/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [The test of science is not whether you are reasonable—there would not be much of physics if that was the case—the test is whether…](https://sms4smile.com/quotes/hermann-bondi/the-test-of-science-is-not-whether-you-are-reasonable-there-would-not/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [ \[Newton's calculations\] entered the marrow of what we know without knowing how we know it. ](https://sms4smile.com/quotes/hermann-bondi/newton-s-calculations-entered-the-marrow-of-what-we-know-without/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [The kind of lecture which I have been so kindly invited to give, and which now appears in book form, gives one a rare…](https://sms4smile.com/quotes/hermann-bondi/the-kind-of-lecture-which-i-have-been-so-kindly-invited-to-give-and/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [We find no sense in talking about something unless we specify how we measure it; a definition by the method of measuring a quantity…](https://sms4smile.com/quotes/hermann-bondi/we-find-no-sense-in-talking-about-something-unless-we-specify-how-we/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [... an opportunity to allow the bees in one's bonnet to buzz even more noisily than usual.](https://sms4smile.com/quotes/hermann-bondi/an-opportunity-to-allow-the-bees-in-one-s-bonnet-to-buzz-even-more/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [Our humanist attitude should therefore throughout be to stress what we all have in common with each other and relegate quarrelsome religion to the…](https://sms4smile.com/quotes/hermann-bondi/our-humanist-attitude-should-therefore-throughout-be-to-stress-what/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [Sometimes I am a little unkind to all my many friends in education ... by saying that from the time it learns to talk…](https://sms4smile.com/quotes/hermann-bondi/sometimes-i-am-a-little-unkind-to-all-my-many-friends-in-education-by/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [The landscape has been so totally changed, the ways of thinking have been so deeply affected, that it is very hard to get hold…](https://sms4smile.com/quotes/hermann-bondi/the-landscape-has-been-so-totally-changed-the-ways-of-thinking-have/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [ \[Science doesn't deal with facts; indeed\] fact is an emotion-loaded word for which there is little place in scientific debate. ](https://sms4smile.com/quotes/hermann-bondi/science-doesn-t-deal-with-facts-indeed-fact-is-an-emotion-loaded-word/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) > [The scientist … must always be prepared to deal with the unknown. It is an essential part of science that you should be able…](https://sms4smile.com/quotes/hermann-bondi/the-scientist-must-always-be-prepared-to-deal-with-the-unknown-it-is/) [Hermann Bondi](https://sms4smile.com/quotes/author/hermann-bondi/) [Explore all 19 Hermann Bondi quotes ](https://sms4smile.com/quotes/author/hermann-bondi/) ## More Assumption quotes > [Next to the assumption of power was the responsibility of relinquishing it.](https://sms4smile.com/quotes/benjamin-disraeli/next-to-the-assumption-of-power-was-the-responsibility-of/) [Benjamin Disraeli](https://sms4smile.com/quotes/author/benjamin-disraeli/) > [It's difficult for people to come to the understanding that only a small minority of the people ever really get the word about life,…](https://sms4smile.com/quotes/earl-nightingale/it-s-difficult-for-people-to-come-to-the-understanding-that-only-a/) [Earl Nightingale](https://sms4smile.com/quotes/author/earl-nightingale/) > [Much like teaching art to young art students age 10 to 15 or so on, you have to break it down into bite-sized pieces,…](https://sms4smile.com/quotes/kehinde-wiley/much-like-teaching-art-to-young-art-students-age-10-to-15-or-so-on/) [Kehinde Wiley](https://sms4smile.com/quotes/author/kehinde-wiley/) > [Neither novels or their readers benefit from any attempts to divine whether any facts hide inside a story. Such efforts attack the very idea…](https://sms4smile.com/quotes/john-green/neither-novels-or-their-readers-benefit-from-any-attempts-to-divine/) [John Green](https://sms4smile.com/quotes/author/john-green/) > [The risk of developing carcinoma of the lung increases steadily as the amount smoked increases. If the risk among non-smokers is taken as unity…](https://sms4smile.com/quotes/richard-doll/the-risk-of-developing-carcinoma-of-the-lung-increases-steadily-as/) Richard Doll > [Fortunately, the mind is restless; when it uncovers a layer of its own deception, gives up an illusion, exposes a lie, it does not…](https://sms4smile.com/quotes/kim-chernin/fortunately-the-mind-is-restless-when-it-uncovers-a-layer-of-its-own/) [Kim Chernin](https://sms4smile.com/quotes/author/kim-chernin/) > [The possibility of saying anything about a thing rests on the assumption that it preserves its identity, or continues to be the same thing…](https://sms4smile.com/quotes/frank-knight/the-possibility-of-saying-anything-about-a-thing-rests-on-the/) [Frank Knight](https://sms4smile.com/quotes/author/frank-knight/) > [She spent hours drawing on her own, trying to perfect her craft. And when she got into music, she had that same diligence in…](https://sms4smile.com/quotes/laura-joplin/she-spent-hours-drawing-on-her-own-trying-to-perfect-her-craft-and/) [Laura Joplin](https://sms4smile.com/quotes/author/laura-joplin/) > [If they are, then the only ultimate truths are the particulars of concrete experience, and no postulate or general assumption is inherent in science…](https://sms4smile.com/quotes/chauncey-wright/if-they-are-then-the-only-ultimate-truths-are-the-particulars-of/) [Chauncey Wright](https://sms4smile.com/quotes/author/chauncey-wright/) > [If he's - the inference is that somehow he thinks slavery is a - is a noble institution I would - I would strongly…](https://sms4smile.com/quotes/george-w-bush/if-he-s-the-inference-is-that-somehow-he-thinks-slavery-is-a-is-a/) [George W. Bush](https://sms4smile.com/quotes/author/george-w-bush/) > [Leadership, pure and simple, is the assumption of responsibility for the pursuit of excellence in group life.](https://sms4smile.com/quotes/philip-selznick/leadership-pure-and-simple-is-the-assumption-of-responsibility-for/) Philip Selznick > [Humans suffer from self-centred notions as to the nature of life. Humans assume that alien life forms should conform to standards that match our…](https://sms4smile.com/quotes/steve-perry/humans-suffer-from-self-centred-notions-as-to-the-nature-of-life/) [Steve Perry](https://sms4smile.com/quotes/author/steve-perry/) > [When I see a fan coming over, I can't help but make an assumption about what they want to talk about. A middle-aged American…](https://sms4smile.com/quotes/natalie-dormer/when-i-see-a-fan-coming-over-i-can-t-help-but-make-an-assumption/) [Natalie Dormer](https://sms4smile.com/quotes/author/natalie-dormer/) > [The Bell curve is a fact of life. The blacks on average score 85 per cent on IQ and it is accurate, nothing to…](https://sms4smile.com/quotes/lee-kuan-yew/the-bell-curve-is-a-fact-of-life-the-blacks-on-average-score-85-per/) [Lee Kuan Yew](https://sms4smile.com/quotes/author/lee-kuan-yew/) > [Pussy Riot have certainly changed some people's assumptions about the role of political art and the relationship between the intelligentsia and the church. That's…](https://sms4smile.com/quotes/masha-gessen/pussy-riot-have-certainly-changed-some-people-s-assumptions-about-the/) [Masha Gessen](https://sms4smile.com/quotes/author/masha-gessen/) [Browse all 1,277 Assumption quotes ](https://sms4smile.com/quotes/about/assumption/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "Quotation", "text": "On the most usual assumption, the universe is homogeneous on the large scale, i.e. down to regions containing each an appreciable number of nebulae. The homogeneity assumption may then be put in the form: An observer situated in a nebula and moving with the nebula will observe the same properties of the universe as any other similarly situated observer at any time.", "creator": { "@type": "Person", "name": "Hermann Bondi" }, "isPartOf": { "@id": "https://sms4smile.com/quotes/#website" }, "url": "https://sms4smile.com/quotes/hermann-bondi/on-the-most-usual-assumption-the-universe-is-homogeneous-on-the-large/", "about": { "@type": "Thing", "name": "Assumption" }, "@id": "https://sms4smile.com/quotes/hermann-bondi/on-the-most-usual-assumption-the-universe-is-homogeneous-on-the-large/#quotation", "image": { "@type": "ImageObject", "@id": "https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg", "contentUrl": "https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg", "url": "https://sms4smile.com/quotes/i/5b2/hermann-bondi-28727_assumption_on-the-most-usual-assumption-the-univers_2119371.jpg", "width": 1080, "height": 1080, "caption": "“On the most usual assumption, the universe is homogeneous on the large scale, i.e. down to regions…” — Hermann Bondi", "creditText": "SMS4Smile Quotes", "creator": { "@id": "https://sms4smile.com/quotes/#organization" } } }, { "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://sms4smile.com/" }, { "@type": "ListItem", "position": 2, "name": "Quotes", "item": "https://sms4smile.com/quotes/" }, { "@type": "ListItem", "position": 3, "name": "Hermann Bondi", "item": "https://sms4smile.com/quotes/author/hermann-bondi/" }, { "@type": "ListItem", "position": 4, "name": "On the most usual assumption, the...", "item": "https://sms4smile.com/quotes/hermann-bondi/on-the-most-usual-assumption-the-universe-is-homogeneous-on-the-large/" } ], "@id": "https://sms4smile.com/quotes/hermann-bondi/on-the-most-usual-assumption-the-universe-is-homogeneous-on-the-large/#breadcrumb" }, { "@type": "WebSite", "@id": "https://sms4smile.com/quotes/#website", "name": "SMS4Smile Quotes", "url": "https://sms4smile.com/quotes/", "publisher": { "@id": "https://sms4smile.com/quotes/#organization" } }, { "@type": "Organization", "@id": "https://sms4smile.com/quotes/#organization", "name": "SMS4Smile Quotes", "url": "https://sms4smile.com/quotes/", "logo": { "@type": "ImageObject", "url": "https://sms4smile.com/quotes/wp-content/themes/sq/assets/icons/icon-512.png", "width": 512, "height": 512 } } ] } ```