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( Nova) A nova (pl. novae or novas) is a cataclysmic nuclear explosion caused by the accretion of hydrogen onto the surface of a white dwarf star. Novae are not to be confused with Type Ia supernovae, or another form of stellar explosion first announced by Caltech in May 2007, Luminous Red Novae.

Astronomers estimate that the Milky Way experiences roughly 30 to 60 novae per year, with a likely rate of about 40.^[1] The number of novae discovered each year is much lower, probably due to great distance and observational biases.^[2] By comparison, the number of novae discovered each year in the nearby Andromeda Galaxy is much lower; roughly ½ to ? that of the Milky Way.^[3]

Recurrent novae like RS Ophiuchi (those with periods on the order of decades) are rare. Astronomers theorize however that most, if not all, novae are recurrent, albeit on time scales ranging from 1,000 to 100,000 years.^[4] The recurrence interval for a nova is less dependent on the white dwarf's accretion rate than on its mass; with their powerful gravity, massive white dwarfs require less accretion to fuel an outburst than lower-mass ones.^[1] Consequently, the interval is shorter for high-mass white dwarfs.^[1]

The astronomer Tycho Brahe observed the supernova SN 1572 in the constellation Cassiopeia, and described it in his book de stella nova (Latin for "concerning the new star"), giving rise to 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. Though this was a supernova and not a classical nova, the terms were considered interchangeable until the 1930s.^[1]

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