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Comet NEOWISE

C/2020 F3, or Comet NEOWISE, is a retrograde comet with a near-parabolic orbit discovered on March 27, 2020, by astronomers using the NEOWISE space telescope. At that time it was a 10th magnitude comet, located 2 AU 300 million km; 190 million mi ...

Comet Shoemaker–Levy 9

Comet Shoemaker-Levy 9 was a comet. It broke apart and crashed into Jupiter, in July 1994. The event was special because people could see, for the first time, how objects in the Solar System, outside Earth, collided. It caused a large amount of c ...

Comet Swift–Tuttle

Comet Swift–Tuttle is a periodic comet with an orbital period of 133 years. It fits the classical definition of a Halley-type comet with a period between 20 and 200 years. It was independently discovered by Lewis Swift and Horace Parnell Tuttle i ...

Comet West

Comet West was a spectacular comet, also considered to qualify for great comet status. It was discovered through pictures by Richard M. West, of the European Southern Observatory, on August 10, 1975. During peak brightness, observers reported tha ...

Great Comet of 1811

The Great Comet of 1811 was a comet visible to the naked eye for about 260 days. This was a record until the appearance of Comet Hale–Bopp in 1997. In October 1811, at its brightest, it displayed an apparent magnitude of 0, with an easily visible ...

Halleys Comet

Halleys Comet is a comet which comes round every 75 or 76 years. When it is near, it can be seen with the naked eye. It will return in 2061. The comet is named after Edmond Halley 1656–1742, an English astronomer, who predicted the comets return. ...

Non-periodic comet

Non-periodic comets are comets have only passed through the Solar System once. They do not orbit around the Sun, or they may take longer than 200 years to orbit. They are on orbits that will not bring them back to the Sun for hundreds, thousands, ...

Periodic comet

A periodic comet is a comet which orbits around the Sun. A short-period comet will complete its orbit in less than 200 years. A long-period comet will take more than 200 years to orbit. In most cases the comets are named after the person who disc ...

Tempel 1

Tempel 1 is a comet which orbits the sun every 5.5 years. It was discovered in 1867 by the astronomer Ernest Tempel. On July 4, 2005, NASA fired a spacecraft from Deep Impact into its surface creating a spectacular explosion. Scientists were able ...

Galaxy

A galaxy is a group of many stars, with gas, dust, and dark matter. The name galaxy is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way. Gravity holds galaxies together against the general expansion of ...

List of galaxies

List of galaxies and galaxy clusters. Because there are so many galaxies in the universe, this list has been divided into several categories. The first catalog that catalogues galaxies is the Catalogue of Galaxies and of Clusters of Galaxies.

List of nearest galaxies

This list of the nearest galaxies to Earth is ordered by increasing distance. Many of the distances are only estimates, and some may be incorrect by 50% or more. The distance ranking in this list should be seen only as a guess. Distances are give ...

Antennae galaxies

The Antennae galaxies are two colliding galaxies. They are in the constellation Corvus. The process takes hundreds of millions of years, maybe even a billion years. The collision, with its clouds of gas, dust and magnetic fields, causes extremely ...

Black hole

A black hole is a region of space from which nothing, even light, can escape. According to the general theory of relativity, it is the result of the curving of spacetime caused by a huge mass. Around a black hole there is a position of no return, ...

Circinus galaxy

The Circinus galaxy is a Seyfert galaxy, very bright and emitting huge amounts of electromagnetic radiation. Circinus is in a constellation of the same name, Circinus constellation. It is one of the closest and nearest galaxies to the Milky Way. ...

Cloverleaf quasar

The Cloverleaf quasar is a quasar that has been mirrored and split into four images that look almost the same, looking like a cloverleaf. The quasar is in the area of the constellation Bootes, at a redshift distance of z = 2.56 {\displaystyle z=2.56}

Dark matter

Dark matter is a type of matter thought to be responsible for much of the mass in the universe. The idea arose when astronomers found that the mass of large astronomical objects, and their gravitational effects, was much greater than the mass fro ...

Gravitational lensing

Gravitational lensing is caused by a massive body between a distant object and ourselves. It can create the appearance of two or more objects where there is really only one. The light from the object gets bent round the massive body in between. T ...

Hubble Deep Field

The Hubble Deep Field, sometimes called the HDF, is an image of a small part of the night sky. The image was taken in the direction of the constellation Ursa Major by the Hubble Space Telescope in 1995. It is important because it shows some of th ...

Hubble Ultra-Deep Field

The Hubble Ultra Deep Field, or HUDF, is an image of a small part of space in the direction of the constellation Fornax. It took more than 3 months to capture this image, from September 24, 2003 to January 16, 2004. It is the furthest image of th ...

Irregular galaxy

An irregular galaxy is a galaxy that does not have a distinct regular shape, like a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular types of the Hubble sequence. They do not have a bulge in the centre, nor a ...

Mice galaxies

The Mice galaxies are two spiral galaxies in the constellation Coma Berenices. About 290 million light-years away, we see them as they began to collide and merge. Their name refers to the long tails produced by tidal action, which is the relative ...

Most distant things

This article lists the most distant things known to us, all of which are galaxies or energy sources inside galaxies. Their distances are described in two ways. redshift = z, and billion light years. As of 2012, there are only about 50 possible ob ...

Phoenix Dwarf

It has got some young stars inside it in east-west direction and the oldest are in north south direction. It seems that its one of the Milky Ways satellite galaxies.

Pinwheel galaxy

The Pinwheel galaxy is a face-on unbarred spiral galaxy in the constellation of Ursa Major, the Great Bear. The galaxy is 21 million light-years six megaparsecs away from us. It was first discovered by Pierre Mechain on March 27 1781. Charles Mes ...

Quasar

Quasars or quasi-stellar radio sources are the most energetic and distant active galactic nuclei. They are quite small in comparison with the energy they put out. Quasars are not much larger than the Solar System. The mechanism of brightness chan ...

Radio galaxy

Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths. They have luminosities up to 10 39 W between 10 MHz and 100 GHz. The radio emission is due to the synchrot ...

Seyfert galaxy

Seyfert galaxies are named after Carl Seyfert who first described them in 1943. These galaxies are one of the two main types of active galaxies. The other large group are quasars. Seyfert galaxies have quasar-like nuclei: they are very distant lu ...

Supermassive black hole

A supermassive black hole is a black hole with a mass that is between 10 5 and 10 the mass of the Sun. Scientists are confident that almost all galaxies, including the Milky Way, have supermassive black holes at their centers.

UDFj-39546284

UDFj-39546284 is a stellar structure reported January 27, 2011 as light from the oldest object. It was detected through infrared observation by the Hubble Space Telescope. It was reported in December 2012 to be at redshift z = 11.9 using Hubble a ...

UDFy-38135539

UDFy-38135539 is a galaxy in the Fornax constellation. At present it is the farthest confirmed object ever seen. UDFy-38135539 is 13.1 billion light years from the Earth.

Zone of Avoidance

The Zone of Avoidance is the area of the night sky that is obscured by our own galaxy, the Milky Way. Dust and stars in the plane of the Milky Way the galactic plane block our view of about 20% of the sky at visible wavelengths. As a result, opti ...

Galaxy cluster

Galaxy clusters are large collections of galaxies. They consist of hundreds of galaxies and galaxy groups, bound together by gravity. Galaxy clusters are much larger than galaxy groups, like our Local Group. Clusters of galaxies should not be con ...

Abell 2029

Abell 2029 or A2029 is a large cluster of galaxies 1 billion light years away in the constellation Virgo. Its central galaxy, IC 1101, is the largest galaxy known. Estimates ranging from 5.6 to over 6 million light years across. Contrast this wit ...

Abell 2142

Abell 2142 is a huge, X-ray luminous galaxy cluster in the constellation Corona Borealis. It is the result of an ongoing merger between two galaxy clusters. The combined cluster is six million light years across, contains hundreds of galaxies and ...

Bullet cluster

The Bullet cluster consists of two colliding clusters of galaxies. Strictly speaking, the name Bullet cluster refers to the smaller subcluster, moving away from the larger one. It is at a co-moving radial distance of 1.141 x 10 9 parsecs. Gravita ...

Galaxy group

A galaxy group is a group of galaxies made up of less than 50 or so members and bound by gravity. Collections of galaxies larger than groups are called galaxy clusters or superclusters. Our own galaxy, the Milky Way, is in the Local Group of more ...

Great Attractor

The Great Attractor is a gigantic mass in space which pulls our Milky Way galaxy, and many other galaxies towards it. p60 The Great Attractor is known by its effect on the movement of galaxies across hundreds of millions of light years mly. Its m ...

CfA2 Great Wall

The Great Wall is one of the largest known super-structures in the Universe. It is a huge group of galaxies about 200 million light-years away. The Great Wall is like a long, thin line filament: it is over 500 million light-years long, 300 millio ...

Hercules–Corona Borealis Great Wall

The Hercules–Corona Borealis Great Wall is the largest known super-structure in the universe. It is a huge group of galaxies forming a giant sheet-like pattern which is about 10 billion light-years long, 7.2 billion light-years wide, and almost 1 ...

Local Group

The Local Group is the group of galaxies that includes our galaxy, the Milky Way. The group has more than 50 galaxies including dwarf galaxies. Its center of mass is somewhere between the Milky Way and the Andromeda galaxy. The galaxies of the Lo ...

Norma Cluster

The Norma Cluster is a rich cluster of galaxies near the center of the Great Attractor. It is both nearby and bright; but it is difficult to observe because it is in the Zone of Avoidance. This is a region near the plane of the Milky Way, which o ...

Ophiuchus Supercluster explosion

NASA and others have published evidence for the biggest explosion seen in the Universe. It is not the first time such an explosion has been seen. This extremely powerful eruption occurred in the Ophiuchus Supercluster. The supercluster is about 3 ...

Shapley Supercluster

The Shapley Supercluster or Shapley Concentration is the largest concentration of galaxies in our nearby universe. It is a gravitationally interacting unit 650 million light years away z=0.046. This means it pulls itself together, instead of expa ...

Stephans Quintet

Stephans Quintet is in the constellation Pegasus. It is a visual grouping of five galaxies of which four are the first compact galaxy group ever discovered. The group is about 280 million light years from Earth. The group was discovered by Edouar ...

Supercluster

Superclusters are large collections of smaller galaxy groups and galaxy clusters. They are one of the largest known structures in the cosmos. Superclusters show that the galaxies in the universe are not evenly distributed. Most, perhaps all, are ...

Virgo Cluster

The Virgo Cluster is a cluster of galaxies whose center is 53.8 ± 0.3 million light years away in the constellation Virgo. The cluster forms the heart of the larger Virgo Supercluster, of which our Local Group is an outlying member. The Virgo Clu ...

Virgo Supercluster

The Virgo Supercluster or Local Supercluster is the large galaxy cluster that contains the Virgo Cluster and the Local Group. At least 100 galaxies and clusters are in it. The diameter of Virgo SC is 33 megaparsecs 110 million light-years. It is ...

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