Question: Information: - A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek "", literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion stars to giants with one hundred trillion stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral and irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant observed galaxy with a comoving distance of 32 billion light-years from Earth, and observed as it existed just 400 million years after the Big Bang. - A constellation is formally defined as a region of the celestial sphere, with boundaries laid down by the International Astronomical Union (IAU). The constellation areas mostly had their origins in Western-traditional patterns of stars from which the constellations take their names. - The International Astronomical Union (IAU UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy. Among other activities, it acts as the internationally recognized authority for assigning designations to celestial bodies (stars, planets, asteroids, etc.) and any surface features on them. - A peculiar galaxy is a galaxy which is unusual in its size, shape, or composition. Peculiar galaxies come about as a result of interactions between galaxies, and they may contain atypical amounts of dust or gas, may have higher or lower surface brightness than a typical galaxy, or may have features such as nuclear jets. They can be highly irregular in shape due to the immense gravitational forces which act on them during encounters with other galaxies. They are the result of recent mergers between two or more normal (i.e. spiral galaxies, elliptical galaxies, etc.) galaxies. Specifically, Peculiar galaxies may be from galaxy mergers and collisions that happened in the recent past. Peculiar galaxies are of similar size to regular sized Spiral and Elliptical galaxies, and seem to have features and properties similar to these galaxy types. Astronomers have identified two types of peculiar galaxies, interacting galaxies and active galactic nuclei (AGN). Also, during collisions it is expected that there would be a spike in activity such as star formation or ignition of the nucleus of one or both galaxies; a common property of Peculiar galaxies as well. Peculiar galaxies are designated by "p" or "pec" in some catalogs. They are snapshots of galaxy mergers in the first millions of years after the collision. That's when the resulting galaxy is in an active state and still maintains some common features of the host galaxies. They constitute between 5% and 10% of the known galaxy population, although most normal galaxies will show peculiar features if examined carefully. Peculiar galaxies show a great diversity of form. The vast majority can be attributed to strong gravitational tides generated in the close passage of two galaxies, to the extent that the terms peculiar galaxy and interacting galaxy are now virtually synonymous. Many peculiar galaxies are experiencing episodes of enhanced star formation, called starbursts. They also show a greater tendency to host ACTIVE GALACTIC NUCLEI (AGN) compared with the normal... - NGC 7252 is a peculiar galaxy resulting from an interaction between two galaxies that started a billion years ago . It is located 220 million light years away in the constellation Aquarius . It is also called Atoms for Peace galaxy , a nickname which comes from its loop - like structure , made of stars , that resembles a diagram of an electron orbiting an atomic nucleus . - A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth. Indeed, most are invisible from Earth even through the most powerful telescopes. - In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth. All objects in the observer's sky can be thought of as projected upon the inside surface of the celestial sphere, as if it were the underside of a dome or a hemispherical screen. The celestial sphere is a practical tool for spherical astronomy, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant. Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'ngc 7252'. Choices: - activity - association - composition - constellation - dark matter - distance - dome - education - episodes - galaxy - giants - hundred - interacting galaxy - march - navigation - plot - population - range - research - size - sky - sphere - star - state - system - two - union - will - word
Answer:
interacting galaxy