{"id":135,"date":"2005-03-26T10:03:00","date_gmt":"2005-03-26T18:03:00","guid":{"rendered":"http:\/\/www.preposterousuniverse.com\/blog\/crabby\/"},"modified":"2005-03-26T10:03:00","modified_gmt":"2005-03-26T18:03:00","slug":"crabby","status":"publish","type":"post","link":"https:\/\/preposterousuniverse.com\/blog\/2005\/03\/26\/crabby\/","title":{"rendered":"Crabby"},"content":{"rendered":"<p>Today&#8217;s <a href=\"http:\/\/antwrp.gsfc.nasa.gov\/apod\/ap050326.html\">Astronomy Picture of the Day<\/a> is one of my favorite images &#8212; a composite view of the Crab Nebula, created by combining images from the Hubble Space Telescope and the Chandra X-Ray Observatory.<\/p>\n<p><center><a border=\"0\" href=\"http:\/\/antwrp.gsfc.nasa.gov\/apod\/ap050326.html\"><img decoding=\"async\" src=\"http:\/\/preposterousuniverse.com\/images\/crab.jpg\" width=\"420\" \/><\/a><\/center><\/p>\n<p>The real nebula wouldn&#8217;t look precisely like this, unless you have X-ray vision. (When I was growing up, pictures of the Crab Nebula looked like <a href=\"http:\/\/db.ira.cnr.it\/skyeye\/gallery_images\/M1.jpg\">this<\/a>.  And we thought it was cool when they started to look like <a href=\"http:\/\/imagine.gsfc.nasa.gov\/Images\/rosat\/snr_crabneb.html\">this<\/a>. Kids today are so spoiled.) The blue part of the image comes from the X-rays observed by Chandra, while the red part is the optical light measured by HST; you can easily make out a disk, several light-years across, as well as a jet being emitted perpendicular to the disk. The energy driving the emission comes from a pulsar at the center of the disk. The pulsar is a rapidly rotating neutron star, the remnant of a supernova explosion observed here on Earth in <a href=\"http:\/\/www.seds.org\/messier\/more\/m001_sn.html\">1054<\/a>. Interestingly, the event was recorded by astronomers in China and also by Native Americans, but not by any European or Arab astronomers.<\/p>\n<p>Don&#8217;t miss the <a href=\"http:\/\/chandra.harvard.edu\/photo\/2002\/0052\/movies.html\">movies<\/a> of ripples propagating through the jet and disk.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today&#8217;s Astronomy Picture of the Day is one of my favorite images &#8212; a composite view of the Crab Nebula, created by combining images from the Hubble Space Telescope and the Chandra X-Ray Observatory. The real nebula wouldn&#8217;t look precisely like this, unless you have X-ray vision. (When I was growing up, pictures of the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-135","post","type-post","status-publish","format-standard","hentry","category-miscellany"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/comments?post=135"}],"version-history":[{"count":0,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/135\/revisions"}],"wp:attachment":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/media?parent=135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/categories?post=135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/tags?post=135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}