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Overlapping galaxies typically refer to a phenomenon in astrophysics where two or more galaxies appear to be close to each other in the sky from our point of view on Earth, but may not necessarily be interacting or in close proximity in three-dimensional space. This can create a visual effect where the features of the galaxies overlap, making them appear as one object or creating interesting patterns in their light.

Peculiar galaxies are non-standard or irregular galaxies that exhibit unusual shapes, structures, or properties compared to more typical galaxy classifications such as elliptical or spiral galaxies. These peculiarities often arise from interactions or mergers with other galaxies, resulting in distorted shapes, asymmetrical features, or unusual star formation rates. Some characteristics of peculiar galaxies include: 1. **Distorted Shapes**: They may appear warped, elongated, or have lumpy structures.

Polar-ring galaxies are a unique type of galaxy characterized by the presence of an outer ring of stars, gas, and dust that orbits around the poles of the central galaxy. This configuration is somewhat unusual because the ring's plane is oriented perpendicularly to the plane of the host galaxy's disk.

Protogalaxies are the early formations of galaxies that are in the process of formation in the universe. They represent the initial stages of galaxy development, often consisting of gas, dust, and dark matter, and they form through the gravitational collapse of matter in the universe. In the context of cosmology, protogalaxies are critical to our understanding of how galaxies evolve.

Ring galaxies are a type of galaxy characterized by a prominent ring-like structure surrounding a central core. These galaxies typically have a distinct, well-defined ring of stars, gas, and dust that forms either as a result of gravitational interactions during collisions or mergers with other galaxies or as a result of internal processes.

Seyfert galaxies are a class of active galaxies characterized by their bright nuclei, which are thought to be powered by supermassive black holes at their centers. They are named after the American astronomer Carl Seyfert, who first classified them in 1943. Seyfert galaxies are divided into two main types: 1. **Seyfert Type 1**: These galaxies exhibit broad emission lines in their optical spectra, indicating fast-moving gas in the vicinity of the black hole.

Spiral galaxies are one of the most common types of galaxies in the universe, characterized by their distinctive spiral structure. They typically consist of a flat, rotating disk containing stars, gas, and dust, as well as a central bulge that houses older stars. The spiral arms extend outward from the center and are often sites of active star formation, with young, hot stars contributing to their luminous appearance.

Starburst galaxies are a type of galaxy that is experiencing an exceptionally high rate of star formation compared to the typical galaxies. This intense star formation phase can occur over a relatively short timeframe, often lasting for a few tens of millions to a few hundred million years. During this period, the rate of star formation can be several times greater than that of a normal galaxy.

Supermassive black holes are a type of black hole that is significantly larger than stellar black holes, typically with masses ranging from millions to billions of times that of our Sun. They are found at the centers of most galaxies, including our own Milky Way, where it is known to host a supermassive black hole called Sagittarius A*.

Wikipedia has several categories that are named after galaxies, often organizing articles related to specific galaxies, their features, and related astronomical topics. Some notable galaxy-related categories include: 1. **Galaxies** - A general category that includes articles about various galaxies. 2. **Spiral galaxies** - A subset focusing on galaxies with a spiral structure, like the Milky Way or Andromeda. 3. **Elliptical galaxies** - Covering galaxies characterized by their elliptical shapes.

The expression "3MM-1" typically refers to a mathematical expression.

A1689-zD1 is a distant galaxy that has garnered significant attention in astronomical studies due to its remarkable properties. It is located in the galaxy cluster Abell 1689, which is about 2.2 billion light-years away from Earth. The designation "zD1" refers to its redshift, which is a measure of how much the light from the galaxy has been stretched due to the expansion of the universe.

A1703 zD6 is a galaxy that is notable for being one of the most distant known galaxies, located at a redshift of approximately z=6. This places it around 13.1 billion light-years away from Earth, making it a subject of significant interest in the study of the early universe.

Abell 1835 IR1916 is a fascinating astronomical object located in the Abell 1835 galaxy cluster, which is situated about 2.7 billion light-years away from Earth in the constellation Pegasus. It is notable for being a strongly lensed galaxy, discovered through the gravitational lensing effect caused by the massive galaxy cluster in front of it.

Abell 2744 Y1 is a galaxy that has garnered significant interest because it is one of the earliest and most distant galaxies observed, thought to have formed not long after the Big Bang. It is located in the galaxy cluster Abell 2744, which is situated about 3.5 billion light-years away from Earth.

The Antlia-Sextans Group is a small group of galaxies that is part of the larger structures in the cosmic neighborhood of the Local Group, which includes the Milky Way and Andromeda. This group is located in the southern sky, primarily in the vicinity of the constellations Antlia and Sextans. It is relatively close to our own galaxy, making it of interest to astronomers studying galactic formation and evolution.

BDF-3299 is a small molecule that has been investigated for its potential use in treating various conditions, including certain types of cancer. It is primarily known as a selective inhibitor of the protein MCL-1 (myeloid cell leukemia 1), which plays a role in regulating cell survival and apoptosis. By inhibiting MCL-1, BDF-3299 may help to induce cell death in cancer cells that are dependent on this protein for survival.

BDF-521 is a chemical compound that has garnered attention in the field of bioactive compounds, specifically as a potential therapeutic agent. It is known as a selective inhibitor of the protein Bcl-2, which plays a crucial role in regulating apoptosis (programmed cell death). BDF-521 may be studied for its implications in cancer treatment, particularly in cases where Bcl-2 overexpression is associated with resistance to chemotherapy.

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. This phenomenon occurs when a massive star collapses under its own gravity at the end of its life cycle. Black holes are characterized by three main properties: 1. **Singularity**: At the center of a black hole lies the singularity, a point where gravity is thought to be infinitely strong, and known laws of physics break down.

The Brightest Cluster Galaxy (BCG) is typically the most luminous galaxy located at the center of a galaxy cluster. BCGs are generally giant elliptical galaxies that can often be found at the center of clusters due to the gravitational effects of the cluster's mass. They are important in the study of galaxy evolution and cluster dynamics because they can provide insights into the history and formation of the cluster itself.