{"id":32608,"date":"2022-06-06T08:18:58","date_gmt":"2022-06-06T08:18:58","guid":{"rendered":"https:\/\/www.skyatnightmagazine.com\/?p=109210"},"modified":"2022-06-06T08:36:10","modified_gmt":"2022-06-06T08:36:10","slug":"how-white-dwarfs-are-born","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/how-white-dwarfs-are-born\/","title":{"rendered":"How white dwarfs are born"},"content":{"rendered":"

<\/p>

By Colin Stuart\n \t\t<\/p>

Published: Monday, 06 June 2022 at 12:00 am<\/p>

\n\n

As a Sun-like star runs out of fuel, it expands and loses its outer layers before becoming an Earth-sized ball called a white dwarf.<\/span><\/p>\n

You may have heard of a white dwarf star before, but what exactly is happening as a star like our own Sun turns into a compact white dwarf?<\/p>\n

Understanding more about white dwarfs and how they are created could enable astronomers to gain a greater understanding as to what will happen to our Solar System in the future<\/a> and what will happen when our Sun dies<\/a>.<\/p>\n

Let\u2019s explore the steps that a Sun-like star goes through in order to become a white dwarf.<\/p>\n

White dwarf formation: step-by-step<\/strong><\/h2>\n
\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>\n

1. Burning hydrogen\u00a0<\/span><\/strong><\/h3>\n

A Sun-like star is powered by nuclear fusion, which turns hydrogen into helium with the release of energy. This can go on for around 10 billion years. During this time it is said to be a \u2018main sequence\u2019 star.<\/p>\n

2. Shell burning<\/strong><\/h3>\n

A star is said to move off the main sequence when it transitions from burning hydrogen to fusing helium. This often happens in layers surrounding the dead core and so astronomers refer to it as \u2018shell burning\u2019.<\/p>\n

3. Red giant<\/strong><\/h3>\n

The star gets through its helium one hundred <\/span>times faster than it did its hydrogen. This creates huge amounts of outwards pressure and it surges out into its planetary system. Its surface would reach<\/span> out to about where Earth is now.<\/p>\n

4. Planetary Nebula<\/strong><\/h3>\n

Helium burning is unstable. It sends shockwaves through the star and convulsions shake it a<\/span>part. A few of these events, each 100,000 years apart, create nested shells called a planetary nebula<\/a>.<\/p>\n

5. White dwarf<\/strong><\/h3>\n

A core of carbon and oxygen \u2013 the products of helium fusion \u2013 is left at the centre. Astronomers refer to this as a white dwarf and it contains about half the mass of the original star packed into an Earth-sized ball.<\/p>\n

This guide originally appeared in the June 2022 issue of <\/strong><\/em>BBC Sky at Night Magazine<\/strong>.<\/strong><\/em><\/p><\/body><\/html>\n

","protected":false},"excerpt":{"rendered":"

By Colin Stuart Published: Monday, 06 June 2022 at 12:00 am As a Sun-like star runs out of fuel, it expands and loses its outer layers before becoming an Earth-sized ball called a white dwarf. You may have heard of a white dwarf star before, but what exactly is happening as a star like our […]<\/p>\n","protected":false},"author":24,"featured_media":32609,"template":"","categories":[1],"acf":{"readingTimeMinutes":"2"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born.jpg",1500,1092,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born-300x218.jpg",300,218,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born-768x559.jpg",768,559,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born-1024x745.jpg",800,582,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born.jpg",1500,1092,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/06\/how-white-dwarfs-are-born.jpg",1500,1092,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"By Colin Stuart Published: Monday, 06 June 2022 at 12:00 am As a Sun-like star runs out of fuel, it expands and loses its outer layers before becoming an Earth-sized ball called a white dwarf. You may have heard of a white dwarf star before, but what exactly is happening as a star like our…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed\/32608"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/32609"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=32608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=32608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}