{"id":997,"date":"2010-03-01T17:13:00","date_gmt":"2010-03-02T01:13:00","guid":{"rendered":"http:\/\/www.todayifoundout.com\/?p=997"},"modified":"2013-06-20T23:35:17","modified_gmt":"2013-06-21T06:35:17","slug":"the-sun-is-white-not-yellow","status":"publish","type":"post","link":"http:\/\/www.todayifoundout.com\/index.php\/2010\/03\/the-sun-is-white-not-yellow\/","title":{"rendered":"The Sun is White Not Yellow"},"content":{"rendered":"<div class=\"pf-content\"><p><a href=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-1002\" title=\"sun\" alt=\"sun\" src=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993.jpg\" width=\"325\" height=\"325\" srcset=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993.jpg 325w, http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993-150x150.jpg 150w, http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993-90x90.jpg 90w, http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/sun-e1267491079993-75x75.jpg 75w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/><\/a><a href='http:\/\/www.todayifoundout.com' title='Interesting Facts'>Today I found out<\/a> the Sun is white, not yellow.<\/p>\n<p>For you graphics people or web developers out there, the exact color of the sun is #fff5f2.\u00a0 The reason the Sun looks yellow to us on Earth is that our atmosphere scatters light from the Sun; so the apparent color of the sun changes.\u00a0 This same scattering effect is <a title=\"Why the sky looks blue\" href=\"http:\/\/www.todayifoundout.com\/index.php\/2010\/01\/why-the-sky-is-blue\/\" target=\"_self\">why the sky looks blue<\/a> in the day time instead of black, like at night.<\/p>\n<p>Specifically, what is going on here is the Earth&#8217;s atmosphere scatters light in the blue and violet wavelength range, so the remaining wavelengths of light appear yellow.\u00a0 This same effect is why the sky will also often appear yellow when the Sun is disappearing over the horizon, as well as why the sky\/Sun can appear more red at times during this phase of the day.<\/p>\n<p>As the sun is setting, more of the shorter wavelength blue is being scattered because of the decreased angle of the sun relative to you; thus the light has to pass through more atmosphere to get to you.\u00a0 This increased diffusion results in less of the blue wavelength being visible to you and thus what remains appears yellow.\u00a0 Similarly, if it is dusty or there are a lot of other larger particles in the air, this will filter out larger wavelengths, resulting in a red sky and red sun.<\/p>\n<p>If you liked this article and the <span id=\"bonusfacts\">Bonus<\/span> Facts below, you might also enjoy:<\/p>\n<ul>\n<li><a href=\"http:\/\/www.todayifoundout.com\/index.php\/2011\/12\/an-asteroid-field-would-actually-be-quite-safe-to-fly-through\/\" target=\"_blank\">An Asteroid Field Would Actually Be Quite Safe to Fly Through<\/a><\/li>\n<li><a href=\"http:\/\/www.todayifoundout.com\/index.php\/2011\/12\/the-earth-is-hottest-when-it-is-furthest-from-the-sun-on-its-orbit-not-when-it-is-closest\/\" target=\"_blank\">The Earth is Hottest When It is Furthest from the Sun, Not Closest<\/a><\/li>\n<li><a href=\"http:\/\/www.todayifoundout.com\/index.php\/2011\/01\/the-difference-between-an-asteroid-and-a-comet\/\" target=\"_blank\">The Difference Between an Asteroid and a Comet<\/a><\/li>\n<li><a href=\"http:\/\/www.todayifoundout.com\/index.php\/2010\/10\/why-the-hottest-part-of-the-summer-is-called-the-dog-days\/\" target=\"_blank\">Why the Hottest Part of the Summer is Called &#8220;The Dog Days&#8221;<\/a><\/li>\n<li><a href=\"http:\/\/www.todayifoundout.com\/index.php\/2013\/04\/the-origin-of-the-7-day-week-and-the-names-of-the-days-of-the-week\/\" target=\"_blank\">Why We Have a Seven Day Week and the Origin of the Names of the Days of the Week<\/a><\/li>\n<\/ul>\n<p><span id=\"bonusfacts\">Bonus<\/span> Facts:<\/p>\n<ul>\n<li>Light travels from the Sun to the Earth in about 8 minutes and 19 seconds.<\/li>\n<li>While it only takes 8 minutes and 19 seconds for the light from the surface of the sun to reach us, it actually takes about 10,000-170,000 years for a photon to travel from the core of the sun to the surface.<\/li>\n<li>Once regarded by astronomers as a small and relatively insignificant star, the Sun is now known to be brighter than about 85% of the stars in the Milky Way.<\/li>\n<li>The Sun has an effective surface temperature of 5780 K, which is equivalent to just under 10,000 F and 5500 C.<\/li>\n<li>The core of the Sun has a density almost 150 times the density of water on Earth.\u00a0 The temperature at the core is close to 14 million Kelvins and Celsius degrees, or 25 million degrees F.<\/li>\n<li>About 3\/4 of the Sun&#8217;s mass consists of hydrogen, with most of the rest being helium (23.8%) and about 2% remaining consisting of other elements such as iron, oxygen, carbon, neon, and a variety of others.<\/li>\n<li>The Sun generates its energy from nuclear fusion at its core fusing the hydrogen nuclei into helium.\u00a0 The nuclear fusion is self regulating; if the Sun&#8217;s diameter gets smaller while maintaining the same mass, the pressure at the core increases creating more nuclear fusion which in turn causes it to expand.\u00a0 If it expands maintaining the same mass, the pressure lessens in the core causing less nuclear fusion.\u00a0 So a natural equilibrium has resulted in this process with our Sun, though there are stars that can be observed going through this process of massive expansion and contraction at very steady rates.<\/li>\n<li>At the core of the Sun, nuclear fusion power produced is estimated at about 276.5 watts\/m^3.\u00a0 Interestingly this power production is more equivalent to a reptile&#8217;s metabolic energy production than what we would think like a nuclear bomb.<\/li>\n<li>This is in contrast to the amount of energy per (W\/m^2) deposited on the surface of the Earth from the Sun, which is about 1368 W\/m^2.<\/li>\n<li>Each second more than four million tons of matter are converted to energy within the Suns core.\u00a0 At this rate, the Sun has so far converted 100 Earth masses of matter into energy.\u00a0 This will give the sun an effective lifetime as a main sequence star of about 10 billion years with about 5 billion years to go.<\/li>\n<li>The Sun does not have enough mass to go supernova and explode.\u00a0 However, in about 5 billion years it will enter a red giant phase steadily expanding until it consumes the Earth.\u00a0 But fear not, the Earth will already be dead in about 1 billion years due to the fact that the sun becomes about 10% brighter every billion years; so in 1 billion years the Earth&#8217;s surface temperature will be such that no liquid water will be able to exist unprotected on the surface of the Earth.<\/li>\n<li>The Sun orbits the center of the Milky Way at a distance of approximately 24,000-26,000 light years.<\/li>\n<li>The Sun completes a clockwise orbit of the Milky Way center in about 225-250 million years.<\/li>\n<li>The Sun is about 150 million km or about 93 million miles from the Earth; this is by definition one astronomical unit (1 AU).<\/li>\n<li>The Sun is almost a perfect sphere; its diameter at its poles differs from the diameter at its equator by only 10 km or 6 miles.<\/li>\n<li>The area of the sun we call the &#8220;surface&#8221; is really just the outermost layer that radiates a significant amount of light.\u00a0 There is actually quite a bit of the Sun above that layer.<\/li>\n<li>The Sun&#8217;s magnetic field is less than half of what it was just 22 years ago.\u00a0 This has shrunken the Sun&#8217;s heliosphere which helps protect the earth from cosmic radiation.\u00a0 Because of this, the Earth is now being struck with significantly more cosmic radiation than just a couple decades ago.<\/li>\n<\/ul>\n<div><!-- wp_ad_camp_1 --><\/div>\n<p>For you graphics and web developers out there, here are some more stars and their associated hex colors:<\/p>\n<p><a href=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/suncolor.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1000\" title=\"star color hex values\" alt=\"star color hex values\" src=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/suncolor.png\" width=\"535\" height=\"370\" srcset=\"http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/suncolor.png 535w, http:\/\/www.todayifoundout.com\/wp-content\/uploads\/2010\/03\/suncolor-340x235.png 340w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/><\/a><\/p>\n<span class=\"collapseomatic \" id=\"id69f1df62b2d27\"  tabindex=\"0\" title=\"Expand for References:\"    >Expand for References:<\/span><div id=\"target-id69f1df62b2d27\" class=\"collapseomatic_content \">\n<ul>\n<li><a title=\"Science Made Simple\" href=\"http:\/\/www.sciencemadesimple.com\/sky_blue.html\" target=\"_blank\">Science Made Simple<\/a><\/li>\n<li><a title=\"What Colour is the Sun?\" href=\"http:\/\/casa.colorado.edu\/~ajsh\/colour\/Tspectrum.html\" target=\"_blank\">What Colour is the Sun?<\/a><\/li>\n<li><a title=\"Sun\" href=\"http:\/\/en.wikipedia.org\/wiki\/Sun\" target=\"_blank\">Sun<\/a><\/li>\n<li><a title=\"Star Color\" href=\"http:\/\/www.vendian.org\/mncharity\/dir3\/starcolor\/\" target=\"_blank\">Star Color<\/a> (image source)<\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p><a href='http:\/\/www.todayifoundout.com' title='Interesting Facts'>Today I found out<\/a> the Sun is white, not yellow. For you graphics people or web developers out there, the exact color of the sun is #fff5f2.\u00a0 The reason the Sun looks yellow to us on Earth is that our atmosphere scatters light from the Sun; so the apparent color of the sun changes.\u00a0 This same scattering effect is why [&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":1002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,10],"tags":[217,169,215,216],"class_list":["post-997","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-today-i-found-out","category-science","tag-colors","tag-myth","tag-sun","tag-sun-color"],"_links":{"self":[{"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/posts\/997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/comments?post=997"}],"version-history":[{"count":10,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/posts\/997\/revisions"}],"predecessor-version":[{"id":1006,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/posts\/997\/revisions\/1006"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/media\/1002"}],"wp:attachment":[{"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/media?parent=997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/categories?post=997"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.todayifoundout.com\/index.php\/wp-json\/wp\/v2\/tags?post=997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}