18 relations: Accretion disk, Apparent magnitude, Binary star, Cataclysmic variable star, Cosmic distance ladder, Dwarf nova, Hubble Space Telescope, Luminosity, Nova, SS Cygni, Superhump, Temperature, U Geminorum, V band, Viscosity, White dwarf, WZ Sagittae, Z Camelopardalis.
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
A binary star is a star system consisting of two stars orbiting around their common barycenter.
Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.
A U Geminorum-type variable star, or dwarf nova (pl. novae) is a type of cataclysmic variable star consisting of a close binary star system in which one of the components is a white dwarf that accretes matter from its companion.
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
A nova (plural novae or novas) or classical nova (CN, plural CNe) 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.
SS Cygni is a variable star in the northern constellation Cygnus (the Swan).
In astronomy, a superhump is a periodic brightening in a cataclysmic variable star system, in which the period is a few percent longer than the orbital period of the system.
Temperature is a physical quantity expressing hot and cold.
U Geminorum (U Gem), in the constellation Gemini, is an archetypal example of a dwarf nova.
The V band ("vee-band") is a standard designation by the Institute of Electrical and Electronic Engineers (IEEE) for a band of frequencies in the microwave portion of the electromagnetic spectrum ranging from 40 to 75 gigahertz (GHz).
The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
WZ Sagittae (WZ Sge) is a cataclysmic dwarf nova star system in the constellation Sagitta.
Z Camelopardalis (Z Cam) is a cataclysmic variable starSIMBAD, (accessed 2012-03-20) in the constellation of Camelopardalis.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.
Dwarf Nova, Dwarf novae, Dwarf novas, ER Ursae Majoris variable, SS Cygni star, SS Cygni variable, SU Ursae Majoris, SU Ursae Majoris star, SU Ursae Majoris stars, SU Ursae Majoris variable, U Geminorum Star, U Geminorum star, U Geminorum variable, WZ Sagittae variable, Z Camelopardalis star, Z Camelopardalis variable, Z Camelopardalis variable star, Z Camelopardalis variable stars.