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18 relations: Billion years, Charles Messier, Constellation, Earth, Epoch (astronomy), Globular cluster, Light-year, Logarithm, Messier object, Metallicity, New General Catalogue, Nicolas-Louis de Lacaille, O'Reilly Media, Power of 10, Sagittarius (constellation), Scientific notation, Sun, Variable star.
Billion years
A billion years (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds.
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Charles Messier
Charles Messier (26 June 1730 – 12 April 1817) was a French astronomer most notable for publishing an astronomical catalogue consisting of nebulae and star clusters that came to be known as the 110 "Messier objects".
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Logarithm
In mathematics, the logarithm is the inverse function to exponentiation.
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Messier object
The Messier objects are a set of 110 astronomical objects, of which 103 were included in lists published by French astronomer Charles Messier in 1771 and 1781.
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Metallicity
In astronomy, metallicity is used to describe the abundance of elements present in an object that are heavier than hydrogen or helium.
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New General Catalogue
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888.
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Nicolas-Louis de Lacaille
Abbé Nicolas-Louis de Lacaille, formerly sometimes spelled de la Caille, (15 March 1713 – 21 March 1762) was a French astronomer.
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O'Reilly Media
O'Reilly Media (formerly O'Reilly & Associates) is an American media company established by Tim O'Reilly that publishes books and Web sites and produces conferences on computer technology topics.
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Power of 10
In mathematics, a power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer).
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Sagittarius (constellation)
Sagittarius is one of the constellations of the zodiac.
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Scientific notation
Scientific notation (also referred to as scientific form or standard index form, or standard form in the UK) is a way of expressing numbers that are too big or too small to be conveniently written in decimal form.
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Sun
The Sun is the star at the center of the Solar System.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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Globular Cluster M55, Globular cluster M55, Messier Object 55, NGC 6809.
