{"id":1299,"date":"2024-02-17T16:53:11","date_gmt":"2024-02-17T11:23:11","guid":{"rendered":"https:\/\/lotusarise.com\/qna\/?p=1299"},"modified":"2024-04-03T07:17:54","modified_gmt":"2024-04-03T01:47:54","slug":"q-which-one-of-the-following-is-a-reason-why-astronomical-distances-are-measured-in-light-years","status":"publish","type":"post","link":"https:\/\/lotusarise.com\/qna\/upsc\/q-which-one-of-the-following-is-a-reason-why-astronomical-distances-are-measured-in-light-years","title":{"rendered":"Q.\u00a0Which one of the following is a reason why astronomical distances are measured in light-years?"},"content":{"rendered":"\n<ul class=\"mcq wp-block-list\">\n<li>Distance among stellar bodies do not change<\/li>\n\n\n\n<li>Gravity of stellar bodies does not change<\/li>\n\n\n\n<li>Light always travels in straight line<\/li>\n\n\n\n<li>Speed of light is always same<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote mcq is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Answer:&nbsp;<\/strong>(d) Speed of light is always same<\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"light-year\">Light Year<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A&nbsp;<strong>light-year is a measurement of distance&nbsp;in space<\/strong>. Light-year is the&nbsp;<strong>distance light travels in one year<\/strong>. The astronomical distances are measured in light-years because,&nbsp;<strong>the&nbsp;speed of light&nbsp;is constant throughout the universe and is known to high precision<\/strong>.\n<ul class=\"wp-block-list\">\n<li>Light zips through interstellar space at 186,000 miles&nbsp;<strong>(300,000 kilometers) per second<\/strong>&nbsp;and 5.88 trillion miles (9.46 trillion kilometers) per year.\n<ul class=\"wp-block-list\">\n<li>In a vacuum, light travels at 670,616,629 mph (1,079,252,849 km\/h). To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).<\/li>\n\n\n\n<li>At first glance, this may seem like an extreme distance, but the enormous scale of the universe dwarfs this length.&nbsp;&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Measuring in light-years also allows astronomers to determine how far back in time they are viewing<\/strong>. Because light takes time to travel to our eyes, everything we view in the night sky has already happened. In other words,&nbsp;<strong>when you observe something 1 light-year away, you see it as it appeared exactly one year ago.&nbsp;<\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Answer:&nbsp;(d) Speed of light is always same Light Year<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1,3],"tags":[44],"years":[52],"class_list":["post-1299","post","type-post","status-publish","format-standard","hentry","category-upsc","category-prelims","tag-science-and-tech","years-52"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"UPSC"},{"value":3,"label":"Prelims"}],"post_tag":[{"value":44,"label":"Science and Tech"}],"years":[{"value":52,"label":"2021"}]},"featured_image_src_large":false,"author_info":{"display_name":"LotusArise","author_link":"https:\/\/lotusarise.com\/qna\/author\/team-lotusarise"},"comment_info":0,"category_info":[{"term_id":1,"name":"UPSC","slug":"upsc","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":1269,"filter":"raw","cat_ID":1,"category_count":1269,"category_description":"","cat_name":"UPSC","category_nicename":"upsc","category_parent":0},{"term_id":3,"name":"Prelims","slug":"prelims","term_group":0,"term_taxonomy_id":3,"taxonomy":"category","description":"","parent":1,"count":1251,"filter":"raw","cat_ID":3,"category_count":1251,"category_description":"","cat_name":"Prelims","category_nicename":"prelims","category_parent":1}],"tag_info":[{"term_id":44,"name":"Science and Tech","slug":"science-and-tech","term_group":0,"term_taxonomy_id":44,"taxonomy":"post_tag","description":"","parent":0,"count":167,"filter":"raw"}],"_links":{"self":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/1299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/comments?post=1299"}],"version-history":[{"count":1,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/1299\/revisions"}],"predecessor-version":[{"id":1314,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/1299\/revisions\/1314"}],"wp:attachment":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/media?parent=1299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/categories?post=1299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/tags?post=1299"},{"taxonomy":"years","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/years?post=1299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}