39 relations: Accretion (astrophysics), Arp-Madore 2, Astronomer, Canis Major, Constellation, Degree (angle), Galactic Center, Galactic Disc, Galactic halo, Galaxy, Galaxy formation and evolution, Globular cluster, Gravitational field, Infrared, Irregular galaxy, Light-year, Local Group, Messier 79, Milky Way, Monoceros Ring, NASA, NGC 1261, NGC 1851, NGC 2298, NGC 2808, Open cluster, Red giant, RR Lyrae variable, Sagittarius Dwarf Spheroidal Galaxy, Satellite galaxy, Sloan Digital Sky Survey, Solar System, Star formation, Stellar classification, Sun, Thick disk, Thin disk, Tidal force, 2MASS.
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk.
Arp-Madore 2 (AM 2, ESO 368-SC 07, IAU cluster number C0737-337) is an open cluster of stars in Puppis.
An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside the scope of Earth.
Canis Major is a constellation in the southern celestial hemisphere.
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.
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.
A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle, defined so that a full rotation is 360 degrees.
The Galactic Center is the rotational center of the Milky Way.
The Galactic Disc is a component of disc galaxies, such as spiral galaxies and lenticular galaxies.
A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
In physics, a gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body.
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.
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.
The Local Group is the galaxy group that includes the Milky Way.
Messier 79 (also known as M79 or NGC 1904) is a globular cluster in the constellation Lepus.
The Milky Way is the galaxy that contains our Solar System.
The Monoceros Ring is a long, complex, ringlike filament of stars that wraps around the Milky Way three times.
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.
NGC 1261, also known as Caldwell 87, is a globular cluster in the constellation Horologium, first discovered by James Dunlop in 1826.
NGC 1851 (also known as Caldwell 73) is a globular cluster located in the constellation Columba.
NGC 2298 is a globular cluster in the southern constellation of Puppis.
NGC 2808 is a globular cluster in the constellation Carina.
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.
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
RR Lyrae variables are periodic variable stars, commonly found in globular clusters.
The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way.
A satellite galaxy is a smaller companion galaxy that travels on bound orbits within the gravitational potential of a more massive and luminous host galaxy (also known as the primary galaxy).
The Sloan Digital Sky Survey or SDSS is a major multi-spectral imaging and spectroscopic redshift survey using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory in New Mexico, United States.
The Solar SystemCapitalization of the name varies.
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
The Sun is the star at the center of the Solar System.
The thick disk is one of the structural components of about 2/3 of all disk galaxies, including the Milky Way.
The thin disk is a structural component of spiral and S0-type galaxies, composing of stars, gas and dust.
The tidal force is an apparent force that stretches a body towards the center of mass of another body due to a gradient (difference in strength) in gravitational field from the other body; it is responsible for the diverse phenomena, including tides, tidal locking, breaking apart of celestial bodies and formation of ring systems within Roche limit, and in extreme cases, spaghettification of objects.
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.
The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.