ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Pulsars, Black Holes and Quasars

Updated on September 12, 2015

Pulsars, Black Holes and Quasars

Pulsars
Pulsars
Black Holes
Black Holes
Quasars
Quasars

Pulsars

Pulsars are rapidly spinning stars that emit pulses of radio waves at regular intervals. The word pulsar stands for pulsating radio star.

When a big star explodes, its outer shell scatters to form a nebula while its core contracts into a denser star called the neutron star. Its neutrons are tightly compressed and it has extremely high density. Neutron stars are very small and dull. The average diameter of a neutron star is 10 km. these neutron stars are called pulsars.

Radio pulses coming from pulsars produce a tick like sound on radio telescope. Neutron stars like lighthouses in space. Ordinary pulsars flash at an interval of every one or half a second. The most rapid flashing pulsar, NP0532 lies in the crab nebula and emits 30 pulses per second. The oldest and the least frequency pulsar is NP0527 which emits pulses every 3.7 seconds. All pulsars emit pulses at a rate of one pulse per 0.03 second to one pulse per 4 seconds.

Most of the pulsars are not visible through optical telescope. They may be observed with the help of radio telescope. Only two pulsars-NP0532 in the Crab Nebula and PSR 0833-35 in Gum Nebula can be seen with the help of optical telescope. Scientists have so far discovered more than 100 pulsars.

Block Holes

When very big stars, three times bigger than the sun, collapse by the force of their own gravity, some black regions are created in the space. These are called black holes. They have gravitational force so enormously high that no matter, not even light can escape from it.

The first black hole was detected in 1972. It was in a binary star of cygnusx-1 which is a powerful source of X-rays. It is a small member of the binary star, which is completely black. It is not a neutron star and, therefore, it is called black hole. Normally black holes emit X-rays and infrared radiation which help in their detection in space. The mass of black holes may be equal to that of 100 million suns.

Quasars

Quasar is an abbreviated form of quasi stellar radio sources. Quasars appear like a star. Through an optical telescope they look like an ordinary dull star, but radio telescope observations have indicated that they are the source of radio waves. Quasar 3C-273 was discovered by Maarten Schmidt in 1962. The value of its red shift was 0.158. Red shift is an effect of change in frequency and is seen in light will shift towards the violet end of the spectrum, and if the object is moving away, its light will shift to the red end of the spectrum. Red shift indicates that the source of light was receding away.

Quasars emit radio waves and X-rays with light. The size of quasars is 1/1, 00,000 of our galaxy but its brightness is 100-200 times more. So far 12000 quasars have been discovered.

Comments

    0 of 8192 characters used
    Post Comment

    No comments yet.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)