Cosmological Principle : Cosmological principle 

On large scales, the Universe is homogeneous and isotropic.

If one assumes these two properties to be true about the Universe, then the only possible cosmic evolution is a global expansion or contraction.

In this case, the velocity between two points must be proportional to their separation; this is Hubble's law.

This principle is tightly related to the more metaphysical Anthropic principle.

Has choicest prints by famous hands engraved; Such as to doubt have rustic readers led; And, where they once agreed, to cavil now. Who with no deep researches vex the brain; And hold their glimmering tapers to the sun; And guard the point no enemies attack. A genius rare but rude was honest John; Drank from her well the waters undefiled; Then often sipp'd and little at a time; And drank them muddy, mix'd with baser things. Science our own! and never taught in schools; And Fate's fix'd will from Nature's wanderings learn. Far from mankind and seeming far from care; Yes! there was he, and there was care with him. Lay humbler works, the pedlar's pack supplied; The Wandering Jew has found his way to fame; Crowns Thumb the Great, and Hickathrift the strong. Jack, by whose arm.html">arm the giant-brood were quell'd: His coat of darkness on his loins he braced; And off the heads of doughty giants stroke: No sound of feet alarm'd the drowsy ear; But heads dropt headlong, wondering why they fell. Half his delighted offspring mount his knees. Has a small space for garden-ground assign'd; The careful peasant plies the sinewy arm, On every foot of that improving ground : Peers not about, some secret fault to spy; Hope, profit, pleasure,--they are all his own. The leek with crown globose and reedy stem; Deep strike the ponderous roots in soil below; Give a warm relish to the night's repast. And cluster'd nuts for neighbouring market stand. The reed-fence rises round some fav'rite spot; Proud hyacinths, the least some florist's prize, .

 On wordlookup.net  

All is still licensed under the GNU FDL.
It uses material from the wikipedia.