{"id":94,"date":"2014-11-19T10:25:38","date_gmt":"2014-11-19T10:25:38","guid":{"rendered":"http:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/?page_id=94"},"modified":"2014-11-19T10:36:50","modified_gmt":"2014-11-19T10:36:50","slug":"cosmology","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/cosmology\/","title":{"rendered":"Cosmology"},"content":{"rendered":"<h4><strong><span style=\"text-decoration: underline\">The Light Year<\/span><\/strong><\/h4>\n<ul>\n<li>The \u201clight year\u201d is a measurement of <strong>distance.<\/strong><\/li>\n<li>1 light year is the distance that light travels in 1 year.<\/li>\n<\/ul>\n<p><strong><em>\u00a0<\/em><\/strong><strong><em>Example<\/em><\/strong><\/p>\n<p><em>(a) <\/em><em>Calculate the number of metres in 1 light year.<\/em><\/p>\n<p><em>\u00a0<\/em><em>(b) <\/em><em>Proxima Centauri, the next closest star after the Sun, is 4.3 light years from the Earth. Calculate this distance in metres.<\/em><\/p>\n<p><em>\u00a0<\/em><strong><em>Solution<\/em><\/strong><\/p>\n<p style=\"text-align: center\"><em>\u00a0<\/em><\/p>\n<p><em><a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture14.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-95\" title=\"Picture14\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture14.png\" alt=\"\" width=\"507\" height=\"202\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture14.png 845w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture14-300x119.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjENL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIEHn%2FBzXH1%2FRTTyfq3FiAtX3Qb9luXA0oCoC9c%2B%2BbVvzAiEAtYge1xF8UPy38Fnc8P%2BrQwm0M%2B%2FuEY%2FcRia2Tb%2BEwFsqwQUIm%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDN7rS20PA%2BTihadRUCqVBfvB%2B8mxOLMLTMSGhIrP6T7U0%2FUA5MC2dAbLZCjnOWkyua7IjGgEXlzhhWff1uLoPbtJt4kwqSyQJYnLNN2devEbEQgzySNt5ZVMcIMbL5HIZ75mKvBsCVwroCqj8l%2FCjaFmILvBnTQRJWOyyFvBs18xyBGQarqOQ9QaFiCj%2BKUziWzQA3ExonnxucfCEdKhdSgBjNq552GPTbpDgu%2BuMKS5E%2B8QcyNmel6nukPnRglEFiVoWwP%2FEFd%2FEL8XPhe0lbIJoigmatnh1aE4fkL2KRycl9%2Bg%2FaD9eAXjKmAmREV86FdBVjel5X9G8%2F7SludiQTqX%2BYxCDzE1SIXkxJonh4e4MSKiFBxEmFzu%2Futs%2BwdETzUIjs8RUeUG%2FYlhq9y%2BIWTF62mgIiwlxwl7xk7Gk2xIAIQaOlqLqgTCZApMVab3unwSSBfhVruVryMEV%2BAn0U6eIpf3WBdShkuk0zFiAPA1t6x04Dx3dABeFO1zMkW%2FGv791TwKYKBOJCrcm55fD5%2FZVN0XN3ZqSwMMLNtkkS2wQFjzTzhioDmTN2vuxmPQta0gwlj4B2J19GniYukSqMVwwY6j8iSAZ1heaUNBCaTSYZJXCq2n2VyO9Y1t%2FLQ%2F1Lxo8O%2Fhr59y72f4k4xL0qW0UntGpxv71exGGzpCIyAWRInlIKeKabCihriBvLwvIvPCLswaRFrNl4at8uzNmNOS1KjnLAglafuSeyRERETfUf%2FDDeht15XJpHfkn1LYZ5CpjVsgc7PY%2B09paqGYO35PDyzZlb8zsRoggbAuY%2BdOJyy0yVedTdHZvUEFljL%2BXe4wHsW%2BoZiME23ClgVBU7PGSV2n32Bia1%2BqBFGq3boByl6VMbdUK7PLloncFHovm4Keyqww7Nbc0AY6sQGDv%2F3rWVbkqXhirMGpVG8sCi2zlYZ8O4kH6Bh1DJkmGU5%2Fo6k%2F1GH5LRVt7b3P9tpnvjTzb73TGtVXFdiKDCo3sGHUoeQDKbBtrLVWC574wPOBlK3xx3u4eTCIGlXOGAdcptfz%2Fp9Gj4Vq2FdxBExg3urxI10s3EIXHop2pBiEPKctrghpLfjbopjoWX83RuBaBWAobDJJxv04WLAQ%2FyrTcPnyz%2FY6rtKfRnmiDyp%2FOJo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47URCSYXAJY%2F20260527%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260527T182349Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=4e9a5e3bb3e025227f48926dc331813fe85e00d92244f0e27a7075ea54a04383 300w\" sizes=\"auto, (max-width: 507px) 85vw, 507px\" \/><\/a>Proxima Centauri is 4.07&#215;10<sup>16<\/sup> m from Earth<\/em><\/p>\n<p><em>\u00a0<\/em><strong><span style=\"text-decoration: underline\">Age of the universe<\/span><\/strong><\/p>\n<p>Current thinking dates the age of the universe as approximately <strong>14 billion years.<\/strong><\/p>\n<p><strong>\u00a0<\/strong><strong><span style=\"text-decoration: underline\">Observable universe<\/span><\/strong><\/p>\n<ul>\n<li>The <strong>universe <\/strong>consists of many galaxies separated by empty space.<\/li>\n<li>A <strong>galaxy <\/strong>is a large cluster of stars (e.g. theMilky Way).<\/li>\n<li>A <strong>star <\/strong>is a massive ball of matter that is undergoing nuclear fusion and emitting light and heat. The Sun is a star.<\/li>\n<li>The sun and many other stars have a solar system. A <strong>solar system <\/strong>consists of a central star orbited by planets.<\/li>\n<li>A <strong>planet <\/strong>is a large ball of matter that orbits a star (e.g. Earth or Jupiter). Planets do not emit light themselves.<\/li>\n<li>Many planets have moons. A <strong>moon <\/strong>is a lump of matter that orbits a planet (e.g. the Moon orbits the Earth. Deimos and Phobos orbit Mars.<\/li>\n<\/ul>\n<p>These are features of the <strong>observable <\/strong>universe. The universe also contains matter that cannot be observed directly, e.g. <strong>dark matter.<\/strong><\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture15.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-98\" title=\"Picture15\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture15.png\" alt=\"\" width=\"699\" height=\"176\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture15.png 998w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture15-300x75.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjENL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIEHn%2FBzXH1%2FRTTyfq3FiAtX3Qb9luXA0oCoC9c%2B%2BbVvzAiEAtYge1xF8UPy38Fnc8P%2BrQwm0M%2B%2FuEY%2FcRia2Tb%2BEwFsqwQUIm%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDN7rS20PA%2BTihadRUCqVBfvB%2B8mxOLMLTMSGhIrP6T7U0%2FUA5MC2dAbLZCjnOWkyua7IjGgEXlzhhWff1uLoPbtJt4kwqSyQJYnLNN2devEbEQgzySNt5ZVMcIMbL5HIZ75mKvBsCVwroCqj8l%2FCjaFmILvBnTQRJWOyyFvBs18xyBGQarqOQ9QaFiCj%2BKUziWzQA3ExonnxucfCEdKhdSgBjNq552GPTbpDgu%2BuMKS5E%2B8QcyNmel6nukPnRglEFiVoWwP%2FEFd%2FEL8XPhe0lbIJoigmatnh1aE4fkL2KRycl9%2Bg%2FaD9eAXjKmAmREV86FdBVjel5X9G8%2F7SludiQTqX%2BYxCDzE1SIXkxJonh4e4MSKiFBxEmFzu%2Futs%2BwdETzUIjs8RUeUG%2FYlhq9y%2BIWTF62mgIiwlxwl7xk7Gk2xIAIQaOlqLqgTCZApMVab3unwSSBfhVruVryMEV%2BAn0U6eIpf3WBdShkuk0zFiAPA1t6x04Dx3dABeFO1zMkW%2FGv791TwKYKBOJCrcm55fD5%2FZVN0XN3ZqSwMMLNtkkS2wQFjzTzhioDmTN2vuxmPQta0gwlj4B2J19GniYukSqMVwwY6j8iSAZ1heaUNBCaTSYZJXCq2n2VyO9Y1t%2FLQ%2F1Lxo8O%2Fhr59y72f4k4xL0qW0UntGpxv71exGGzpCIyAWRInlIKeKabCihriBvLwvIvPCLswaRFrNl4at8uzNmNOS1KjnLAglafuSeyRERETfUf%2FDDeht15XJpHfkn1LYZ5CpjVsgc7PY%2B09paqGYO35PDyzZlb8zsRoggbAuY%2BdOJyy0yVedTdHZvUEFljL%2BXe4wHsW%2BoZiME23ClgVBU7PGSV2n32Bia1%2BqBFGq3boByl6VMbdUK7PLloncFHovm4Keyqww7Nbc0AY6sQGDv%2F3rWVbkqXhirMGpVG8sCi2zlYZ8O4kH6Bh1DJkmGU5%2Fo6k%2F1GH5LRVt7b3P9tpnvjTzb73TGtVXFdiKDCo3sGHUoeQDKbBtrLVWC574wPOBlK3xx3u4eTCIGlXOGAdcptfz%2Fp9Gj4Vq2FdxBExg3urxI10s3EIXHop2pBiEPKctrghpLfjbopjoWX83RuBaBWAobDJJxv04WLAQ%2FyrTcPnyz%2FY6rtKfRnmiDyp%2FOJo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47URCSYXAJY%2F20260527%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260527T182349Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=a0a4884fbdf5cd71b590ce6c42b98d811128e0e7a2ad5a7ce47c3fe8d9154bcb 300w\" sizes=\"auto, (max-width: 699px) 85vw, 699px\" \/><\/a><\/p>\n<p><strong><span style=\"text-decoration: underline\">Radiation from space<\/span><\/strong><\/p>\n<p>The main types of radiation received from space (being emitted from stars, galaxies, etc.) are<\/p>\n<ul>\n<li>Electromagnetic radiation (across the entire spectrum from radio to gamma)<\/li>\n<li>Cosmic rays (mainly energetic protons)<\/li>\n<li>Neutrinos (tiny elementary particles with no charge)<\/li>\n<\/ul>\n<p><strong><span style=\"text-decoration: underline\">Detectors of electromagnetic radiation<\/span><\/strong><\/p>\n<p style=\"text-align: center\">\u00a0<\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture16.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-100\" title=\"Picture16\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture16.png\" alt=\"\" width=\"407\" height=\"176\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture16.png 581w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture16-300x130.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjENL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIEHn%2FBzXH1%2FRTTyfq3FiAtX3Qb9luXA0oCoC9c%2B%2BbVvzAiEAtYge1xF8UPy38Fnc8P%2BrQwm0M%2B%2FuEY%2FcRia2Tb%2BEwFsqwQUIm%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDN7rS20PA%2BTihadRUCqVBfvB%2B8mxOLMLTMSGhIrP6T7U0%2FUA5MC2dAbLZCjnOWkyua7IjGgEXlzhhWff1uLoPbtJt4kwqSyQJYnLNN2devEbEQgzySNt5ZVMcIMbL5HIZ75mKvBsCVwroCqj8l%2FCjaFmILvBnTQRJWOyyFvBs18xyBGQarqOQ9QaFiCj%2BKUziWzQA3ExonnxucfCEdKhdSgBjNq552GPTbpDgu%2BuMKS5E%2B8QcyNmel6nukPnRglEFiVoWwP%2FEFd%2FEL8XPhe0lbIJoigmatnh1aE4fkL2KRycl9%2Bg%2FaD9eAXjKmAmREV86FdBVjel5X9G8%2F7SludiQTqX%2BYxCDzE1SIXkxJonh4e4MSKiFBxEmFzu%2Futs%2BwdETzUIjs8RUeUG%2FYlhq9y%2BIWTF62mgIiwlxwl7xk7Gk2xIAIQaOlqLqgTCZApMVab3unwSSBfhVruVryMEV%2BAn0U6eIpf3WBdShkuk0zFiAPA1t6x04Dx3dABeFO1zMkW%2FGv791TwKYKBOJCrcm55fD5%2FZVN0XN3ZqSwMMLNtkkS2wQFjzTzhioDmTN2vuxmPQta0gwlj4B2J19GniYukSqMVwwY6j8iSAZ1heaUNBCaTSYZJXCq2n2VyO9Y1t%2FLQ%2F1Lxo8O%2Fhr59y72f4k4xL0qW0UntGpxv71exGGzpCIyAWRInlIKeKabCihriBvLwvIvPCLswaRFrNl4at8uzNmNOS1KjnLAglafuSeyRERETfUf%2FDDeht15XJpHfkn1LYZ5CpjVsgc7PY%2B09paqGYO35PDyzZlb8zsRoggbAuY%2BdOJyy0yVedTdHZvUEFljL%2BXe4wHsW%2BoZiME23ClgVBU7PGSV2n32Bia1%2BqBFGq3boByl6VMbdUK7PLloncFHovm4Keyqww7Nbc0AY6sQGDv%2F3rWVbkqXhirMGpVG8sCi2zlYZ8O4kH6Bh1DJkmGU5%2Fo6k%2F1GH5LRVt7b3P9tpnvjTzb73TGtVXFdiKDCo3sGHUoeQDKbBtrLVWC574wPOBlK3xx3u4eTCIGlXOGAdcptfz%2Fp9Gj4Vq2FdxBExg3urxI10s3EIXHop2pBiEPKctrghpLfjbopjoWX83RuBaBWAobDJJxv04WLAQ%2FyrTcPnyz%2FY6rtKfRnmiDyp%2FOJo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47URCSYXAJY%2F20260527%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260527T182349Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=9be38d32818c727496272e068813e1083fb199287954949f3d77cc7b3e4769a5 300w\" sizes=\"auto, (max-width: 407px) 85vw, 407px\" \/><\/a><strong>\u00a0<\/strong><\/p>\n<p><strong><span style=\"text-decoration: underline\">Spectra<\/span><\/strong><\/p>\n<ul>\n<li>White light is made up of a range of colours.<\/li>\n<li>These colours can be separated by splitting white light with a <strong>prism <\/strong>to obtain a <strong>spectrum<\/strong>.<\/li>\n<\/ul>\n<p style=\"text-align: center\"><a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture17.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-105\" title=\"Picture17\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture17.png\" alt=\"\" width=\"448\" height=\"227\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture17.png 498w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture17-300x151.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjENL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIEHn%2FBzXH1%2FRTTyfq3FiAtX3Qb9luXA0oCoC9c%2B%2BbVvzAiEAtYge1xF8UPy38Fnc8P%2BrQwm0M%2B%2FuEY%2FcRia2Tb%2BEwFsqwQUIm%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDN7rS20PA%2BTihadRUCqVBfvB%2B8mxOLMLTMSGhIrP6T7U0%2FUA5MC2dAbLZCjnOWkyua7IjGgEXlzhhWff1uLoPbtJt4kwqSyQJYnLNN2devEbEQgzySNt5ZVMcIMbL5HIZ75mKvBsCVwroCqj8l%2FCjaFmILvBnTQRJWOyyFvBs18xyBGQarqOQ9QaFiCj%2BKUziWzQA3ExonnxucfCEdKhdSgBjNq552GPTbpDgu%2BuMKS5E%2B8QcyNmel6nukPnRglEFiVoWwP%2FEFd%2FEL8XPhe0lbIJoigmatnh1aE4fkL2KRycl9%2Bg%2FaD9eAXjKmAmREV86FdBVjel5X9G8%2F7SludiQTqX%2BYxCDzE1SIXkxJonh4e4MSKiFBxEmFzu%2Futs%2BwdETzUIjs8RUeUG%2FYlhq9y%2BIWTF62mgIiwlxwl7xk7Gk2xIAIQaOlqLqgTCZApMVab3unwSSBfhVruVryMEV%2BAn0U6eIpf3WBdShkuk0zFiAPA1t6x04Dx3dABeFO1zMkW%2FGv791TwKYKBOJCrcm55fD5%2FZVN0XN3ZqSwMMLNtkkS2wQFjzTzhioDmTN2vuxmPQta0gwlj4B2J19GniYukSqMVwwY6j8iSAZ1heaUNBCaTSYZJXCq2n2VyO9Y1t%2FLQ%2F1Lxo8O%2Fhr59y72f4k4xL0qW0UntGpxv71exGGzpCIyAWRInlIKeKabCihriBvLwvIvPCLswaRFrNl4at8uzNmNOS1KjnLAglafuSeyRERETfUf%2FDDeht15XJpHfkn1LYZ5CpjVsgc7PY%2B09paqGYO35PDyzZlb8zsRoggbAuY%2BdOJyy0yVedTdHZvUEFljL%2BXe4wHsW%2BoZiME23ClgVBU7PGSV2n32Bia1%2BqBFGq3boByl6VMbdUK7PLloncFHovm4Keyqww7Nbc0AY6sQGDv%2F3rWVbkqXhirMGpVG8sCi2zlYZ8O4kH6Bh1DJkmGU5%2Fo6k%2F1GH5LRVt7b3P9tpnvjTzb73TGtVXFdiKDCo3sGHUoeQDKbBtrLVWC574wPOBlK3xx3u4eTCIGlXOGAdcptfz%2Fp9Gj4Vq2FdxBExg3urxI10s3EIXHop2pBiEPKctrghpLfjbopjoWX83RuBaBWAobDJJxv04WLAQ%2FyrTcPnyz%2FY6rtKfRnmiDyp%2FOJo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47URCSYXAJY%2F20260527%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260527T182349Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=fd5287eac5af212a1fabcc87790d82d4f8ea34f4cfc4175647624a0f1a8381c4 300w\" sizes=\"auto, (max-width: 448px) 85vw, 448px\" \/><\/a><\/p>\n<p>\u00a0<\/p>\n<ul>\n<li>A spectrum can also be produced using a <strong>diffraction grating.<\/strong><\/li>\n<li>A <strong>line absorption spectrum <\/strong>consists of a complete (continuous) spectrum with certain colours missing which appear as black lines in the spectrum.<\/li>\n<\/ul>\n<p style=\"text-align: center\"><a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture18.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-106\" title=\"Picture18\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture18.png\" alt=\"\" width=\"661\" height=\"107\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture18.png 734w, 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300w\" sizes=\"auto, (max-width: 661px) 85vw, 661px\" \/><\/a><\/p>\n<ul>\n<li>A <strong>line emission spectrum <\/strong>consists of lines of light of distinct colours rather than a continuous spectrum.<\/li>\n<\/ul>\n<p style=\"text-align: center\">\u00a0<a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture19.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-108\" title=\"Picture19\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture19.png\" alt=\"\" width=\"712\" height=\"123\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture19.png 791w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hyndsecphysn5s4\/uploads\/sites\/5147\/2014\/11\/Picture19-300x51.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjENL%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIEHn%2FBzXH1%2FRTTyfq3FiAtX3Qb9luXA0oCoC9c%2B%2BbVvzAiEAtYge1xF8UPy38Fnc8P%2BrQwm0M%2B%2FuEY%2FcRia2Tb%2BEwFsqwQUIm%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwyNzM1NzAxOTU0MzMiDN7rS20PA%2BTihadRUCqVBfvB%2B8mxOLMLTMSGhIrP6T7U0%2FUA5MC2dAbLZCjnOWkyua7IjGgEXlzhhWff1uLoPbtJt4kwqSyQJYnLNN2devEbEQgzySNt5ZVMcIMbL5HIZ75mKvBsCVwroCqj8l%2FCjaFmILvBnTQRJWOyyFvBs18xyBGQarqOQ9QaFiCj%2BKUziWzQA3ExonnxucfCEdKhdSgBjNq552GPTbpDgu%2BuMKS5E%2B8QcyNmel6nukPnRglEFiVoWwP%2FEFd%2FEL8XPhe0lbIJoigmatnh1aE4fkL2KRycl9%2Bg%2FaD9eAXjKmAmREV86FdBVjel5X9G8%2F7SludiQTqX%2BYxCDzE1SIXkxJonh4e4MSKiFBxEmFzu%2Futs%2BwdETzUIjs8RUeUG%2FYlhq9y%2BIWTF62mgIiwlxwl7xk7Gk2xIAIQaOlqLqgTCZApMVab3unwSSBfhVruVryMEV%2BAn0U6eIpf3WBdShkuk0zFiAPA1t6x04Dx3dABeFO1zMkW%2FGv791TwKYKBOJCrcm55fD5%2FZVN0XN3ZqSwMMLNtkkS2wQFjzTzhioDmTN2vuxmPQta0gwlj4B2J19GniYukSqMVwwY6j8iSAZ1heaUNBCaTSYZJXCq2n2VyO9Y1t%2FLQ%2F1Lxo8O%2Fhr59y72f4k4xL0qW0UntGpxv71exGGzpCIyAWRInlIKeKabCihriBvLwvIvPCLswaRFrNl4at8uzNmNOS1KjnLAglafuSeyRERETfUf%2FDDeht15XJpHfkn1LYZ5CpjVsgc7PY%2B09paqGYO35PDyzZlb8zsRoggbAuY%2BdOJyy0yVedTdHZvUEFljL%2BXe4wHsW%2BoZiME23ClgVBU7PGSV2n32Bia1%2BqBFGq3boByl6VMbdUK7PLloncFHovm4Keyqww7Nbc0AY6sQGDv%2F3rWVbkqXhirMGpVG8sCi2zlYZ8O4kH6Bh1DJkmGU5%2Fo6k%2F1GH5LRVt7b3P9tpnvjTzb73TGtVXFdiKDCo3sGHUoeQDKbBtrLVWC574wPOBlK3xx3u4eTCIGlXOGAdcptfz%2Fp9Gj4Vq2FdxBExg3urxI10s3EIXHop2pBiEPKctrghpLfjbopjoWX83RuBaBWAobDJJxv04WLAQ%2FyrTcPnyz%2FY6rtKfRnmiDyp%2FOJo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47URCSYXAJY%2F20260527%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260527T182349Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=2865cf494093d142cc424dbf00a011bfb726cbc0b84500196c189afa46d7e572 300w\" sizes=\"auto, (max-width: 712px) 85vw, 712px\" \/><\/a><\/p>\n<ul>\n<li>Every element produces a unique line spectrum. Studying line spectra allows the elements present in a light source (e.g. a star)to be identified<\/li>\n<li>This can help to identify the type, distance, age or speed of a star.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The Light Year The \u201clight year\u201d is a measurement of distance. 1 light year is the distance that light travels in 1 year. \u00a0Example (a) Calculate the number of metres in 1 light year. \u00a0(b) Proxima Centauri, the next closest star after the Sun, is 4.3 light years from the Earth. Calculate this distance in &hellip; <a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/cosmology\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Cosmology&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-94","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/pages\/94","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/comments?post=94"}],"version-history":[{"count":10,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/pages\/94\/revisions"}],"predecessor-version":[{"id":110,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/pages\/94\/revisions\/110"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5s4\/wp-json\/wp\/v2\/media?parent=94"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}