Nova

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nova

What does capricious mean? Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! We have a hard decision to make. Or 'unessential'? And who put it there, anyway? Literally How to use a word that literally drives some people nuts. Is Singular 'They' a Better Choice? Come look at pictures of baby animals. Can you correctly identify these flowers? Can you spell these 10 commonly misspelled words?

Do you know the person or title these quotes describe? Login or Register. Save Word. Log In. First Known Use of nova Noun 1in the meaning defined above Noun 2in the meaning defined above. History and Etymology for nova Noun 1 borrowed from New Latin, "newly visible star or nebula" probably originally as ellipsis of nebula nova, later taken as ellipsis of stella nova "new star"from feminine of Latin novus "new" — more at new entry 1 Noun 2 short for Nova Scotia salmon.

Keep scrolling for more. Learn More about nova. Time Traveler for nova The first known use of nova was in See more words from the same year. Statistics for nova Look-up Popularity. Comments on nova What made you want to look up nova? Get Word of the Day daily email! Test Your Vocabulary.

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Take the quiz Citation Do you know the person or title these quotes describe? Play the game.Nova Zembla appeared on maps in newspapers around the globe, with fall-out patterns noted.

The Soviets stopped setting off nukes at Nova Zembla after that, owing to international pressure.

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In Mayhis expedition ran aground on the northern edge of Nova Zembla, and his ship was destroyed by moving glaciers. It would make a summer climate of Nova Zembla, to say nothing of Lisbon. They had found Nova Scotia seemingly and called it Markland from its woods. In May his failing health led to his being appointed lieutenant-governor of Nova Scotia. The Nova legenda was printed by Wynkyn de Worde in and again in England paid little attention to Nova Scotia untilwhen four thousand emigrants were sent over to found Halifax.

Novae are usually associated with the last stages in the life of a star. See supernova. Advertisement top definitions quizzes related content examples explore dictionary british scientific cultural nova.

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Take this quiz on the Words of the Day from April 6—12 to find out! Compare supernova. Origin of nova —90; novus new. Also called Nova Salmon. Compare Nova Scotia salmon. Words related to nova starsupernovasuperstarorb. Lectures Delivered in America in Charles Kingsley. The Tribune of Nova Scotia W. William Lawson Grant. The Colonies Reuben Gold Thwaites.

A white dwarf star that suddenly and temporarily becomes extremely bright as a result of the explosion at its surface of material accreted from an expanding companion star. The material, mostly hydrogen and helium, is attracted by the white dwarf's gravity and accumulates under growing pressure and heat until nuclear fusion is ignited.

Unlike a supernova, a nova is not blown apart by the explosion and gradually returns to its original brightness over a period of weeks to years. Because of their sudden appearance where no star had been previously visible, novae were long thought to be new stars.

Sincenovae have been classified as variable stars. All rights reserved.We're watching " Tiger King " on Netflix for sure. Our recommendations also include " Night on Earth ", " Ozark ," and more.

See our picks.

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Up-close footage provides a look at the strength, eyesight and flying skills of an eagle, and reveals the danger and drama of chicks as they struggle to survive. Since its premiere inthis Emmy-winning documentary series has presented hundreds of hours comprising profiles of outstanding American cultural artists. Past subjects have included Mysteries involving notable historical events, people and locations are scientifically examined.

Appraisers of antiques travel with the show to various cities. Area citizens bring articles for appraisal and often relate the histories of these items. The appraisers then expand on what A team of experts from auction houses tours towns throughout the UK to value treasures brought in by members of the public.

Charlie Rose interviews noteworthy people in fields including politics and government, business and economics, science and technology, media, sports and the arts. A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques.

A previous reviewer accused "Nova" of dumbing down science. I disagree. The PBS series looks at almost ever scientific topic, breaking it down so that everyone can understand it. The series shows us that there is so much to learn about the universe, and even our own world.

Whether it's environmental issues, reproduction, or invention, there's so much to learn. Anyone hoping to know more about anything should definitely watch it. I've never seen that one, so I can only take this one at face value.A nova plural novae or novas is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months. Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars.

All observed novae involve a white dwarf in a close binary system. The main sub-classes of novae are classical novae, recurrent novae RNeand dwarf novae.

They are all considered to be cataclysmic variable stars. Classical nova eruptions are the most common type of nova. They are likely created in a close binary star system consisting of a white dwarf and either a main sequencesubgiantor red giant star. When the orbital period falls in the range of several days to one day, the white dwarf is close enough to its companion star to start drawing accreted matter onto the surface of the white dwarf, which creates a dense but shallow atmosphere.

This atmosphere, mostly consisting of hydrogen, is thermally heated by the hot white dwarf and eventually reaches a critical temperature causing ignition of rapid runaway fusion. The sudden increase in energy expels the atmosphere into interstellar space creating the envelope seen as visible light during the nova event and previously mistaken as a "new" star. A few novae produce short-lived nova remnantslasting for perhaps several centuries.

Recurrent nova processes are the same as the classical nova, except that the fusion ignition may be repetitive because the companion star can again feed the dense atmosphere of the white dwarf. Novae most often occur in the sky along the path of the Milky Wayespecially near the observed galactic centre in Sagittarius; however, they can appear anywhere in the sky. They occur far more frequently than galactic supernovaeaveraging about ten per year. Most are found telescopically, perhaps only one every 12—18 months reaching naked-eye visibility.

Novae reaching first or second magnitude occur only several times per century. The last bright nova was V Centauri reaching 3. During the sixteenth century, astronomer Tycho Brahe observed the supernova SN in the constellation Cassiopeia. He described it in his book De nova stella Latin for "concerning the new star"giving rise to the adoption of the name nova.

In this work he argued that a nearby object should be seen to move relative to the fixed stars, and that the nova had to be very far away. Although this event was a supernova and not a nova, the terms were considered interchangeable until the s.

nova

Although the term "stella nova" means "new star", novae most often take place as a result of white dwarfswhich are remnants of extremely old stars. Evolution of potential novae begins with two main sequence stars in a binary system. One of the two evolves into a red giantleaving its remnant white dwarf core in orbit with the remaining star. The second star—which may be either a main sequence star or an aging giant—begins to shed its envelope onto its white dwarf companion when it overflows its Roche lobe.

As a result, the white dwarf steadily captures matter from the companion's outer atmosphere in an accretion disk, and in turn, the accreted matter falls into the atmosphere. As the white dwarf consists of degenerate matterthe accreted hydrogen does not inflate, but its temperature increases. Hydrogen fusion may occur in a stable manner on the surface of the white dwarf for a narrow range of accretion rates, giving rise to a super soft X-ray sourcebut for most binary system parameters, the hydrogen burning is unstable thermally and rapidly converts a large amount of the hydrogen into other, heavier chemical elements in a runaway reaction, [1] liberating an enormous amount of energy.

This blows the remaining gases away from the surface of the white dwarf surface and produces an extremely bright outburst of light. The rise to peak brightness may be very rapid, or gradual. This is related to the speed class of the nova; yet after the peak, the brightness declines steadily.

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Furthermore, only five percent of the accreted mass is fused during the power outburst. Potentially, a white dwarf can generate multiple novae over time as additional hydrogen continues to accrete onto its surface from its companion star. An example is RS Ophiuchiwhich is known to have flared six times in,and Occasionally, novae are bright enough and close enough to Earth to be conspicuous to the unaided eye.We're watching " Tiger King " on Netflix for sure.

Our recommendations also include " Night on Earth ", " Ozark ," and more. See our picks. Since its premiere inthis Emmy-winning documentary series has presented hundreds of hours comprising profiles of outstanding American cultural artists.

Past subjects have included Mysteries involving notable historical events, people and locations are scientifically examined. Appraisers of antiques travel with the show to various cities. Area citizens bring articles for appraisal and often relate the histories of these items. The appraisers then expand on what A team of experts from auction houses tours towns throughout the UK to value treasures brought in by members of the public.

Charlie Rose interviews noteworthy people in fields including politics and government, business and economics, science and technology, media, sports and the arts.

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. A previous reviewer accused "Nova" of dumbing down science. I disagree. The PBS series looks at almost ever scientific topic, breaking it down so that everyone can understand it.

The series shows us that there is so much to learn about the universe, and even our own world. Whether it's environmental issues, reproduction, or invention, there's so much to learn. Anyone hoping to know more about anything should definitely watch it. I've never seen that one, so I can only take this one at face value. The conclusion is that it's one of the best shows out there. I recommend it. Sign In.

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Nova (disambiguation)

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