23 relations: Billion years, Caldwell catalogue, Cambridge University Press, Constellation, Effective temperature, Epoch (astronomy), Escape velocity, Globular cluster, Hubble Space Telescope, James Dunlop, La Silla Observatory, Light-year, Messier 4, Milky Way, Monthly Notices of the Royal Astronomical Society, NASA, Peculiar velocity, Radial velocity, Sky-Map.org, Solar mass, Space Telescope Science Institute, Sun, Vela (constellation).
A billion years (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds.
The Caldwell Catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers.
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
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.
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
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.
In physics, escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a massive body.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
James Dunlop FRSE (31 October 1793 – 22 September 1848) was a Scottish astronomer, noted for his work in Australia.
La Silla Observatory is an astronomical observatory in Chile with three telescopes built and operated by the European Southern Observatory (ESO).
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.
Messier 4 or M4 (also designated NGC 6121) is a globular cluster in the constellation of Scorpius.
The Milky Way is the galaxy that contains our Solar System.
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
Peculiar motion or peculiar velocity refers to the velocity of an object relative to a rest frame — usually a frame in which the average velocity of some objects is zero.
The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.
Sky-Map.org (or WikiSky.org) is a wiki and interactive sky map that covers more than half a billion celestial objects.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
The Space Telescope Science Institute (STScI) is the science operations center for the Hubble Space Telescope (HST; in orbit since 1990) and for the James Webb Space Telescope (JWST; scheduled to be launched in March 2021).
The Sun is the star at the center of the Solar System.
Vela is a constellation in the southern sky.