A nova is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star that slowly fades over weeks or months. Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars. All observed novae involve white dwarfs in close binary systems. The main sub-classes of novae are classical novae, recurrent novae, and dwarf novae. They are all considered to be cataclysmic variable stars. Classical nova eruptions are the most common type. They are likely created in a close binary star system consisting of a white dwarf and either a main sequence, subgiant, or 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.

Read more in the app

eROSITA Detects X-rays from Nova in Fireball Phase

Nova Scotia spaceport project aims to launch clean-tech rockets

NOVA | Ultimate Space Telescope | Season 49 | Episode 10 | PBS

This Record-Fast Nova Could Be Seen With The Naked Eye For a Day And Then Vanished

Record ‘Fast Nova’ Flares Over a Single Day

A weird star produced the fastest nova on record

Fastest nova ever found 'rings' like a bell thanks to a feeding and magnetic white dwarf. The nova eruption increased the star's brightness some 10,000 times (magnitude 16 to magnitude 6), briefly making it visible to the naked eye. However, it significantly dimmed within a day instead of weeks.

Fastest nova ever seen 'rings' like a bell thanks to feeding white dwarf

In a Flash: Weird Star Produces the Fastest Nova on Record

Astronomers Finally Catch a Nova Detonating on a White Dwarf as it's Happening

Astronomers Witness The X-Ray 'Fireball' of a Stellar Nova For The First Time

Violent stellar explosion produces highest-energy gamma-rays ever observed from a nova

New Type of Nova Discovered: Micronova

MAGIC Telescopes Capture Gigantic Thermonuclear Nova Explosion

MAGIC telescopes observe nova explosion

MAGIC Telescopes Detect Gamma Rays from Recurrent Nova

Nova outbursts are apparently a source for cosmic rays

Astronomy Jargon 101: Nova

Intuitive Machines Nova-C Lander Selected by NASA To Deliver Science Investigations to the Moon

r/space! We've just unveiled our new 5-part series, NOVA Universe Revealed. Take a ringside seat as we explore everything from stars to the Milky Way to alien worlds to black holes and the birth of the universe as we know it: