Information:  - The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990, and remains in operation. Although not the first space telescope, Hubble is one of the largest and most versatile, and is well known as both a vital research tool and a public relations boon for astronomy. The HST is named after the astronomer Edwin Hubble, and is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.  - The Milky Way is the galaxy that contains our Solar System. The descriptive "milky" is derived from the appearance from Earth of the galaxy  a band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. The term "Milky Way" is a translation of the Latin ', from the Greek (', "milky circle"). From Earth, the Milky Way appears as a band because its disk-shaped structure is viewed from within. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies.  - The Galactic Center is the rotational center of the Milky Way. The estimates for its location range from 7.6 to 8.7 kiloparsecs (about 25,000 to 28,000 lightyears) from Earth in the direction of the constellations Sagittarius, Ophiuchus, and Scorpius where the Milky Way appears brightest. There is strong evidence consistent with the existence of a supermassive black hole at the Galactic Center of the Milky Way.  - WR 102ka , also known as the Peony star , is a Wolf - Rayet star that is one of several candidates for the most luminous known star in the Milky Way . An even more luminous yet closer star , WR 25 , appears to be most likely to the title . Another nearer star Eta Carinae , which was the second brightest star in the sky for a few years in the 19th century , appears to be slightly more luminous than WR 102ka , but is known to be a binary star system . There is also the more recently discovered Pistol star that , like the Peony star , derives its name from the shape of the nebula in which it is embedded , and which it has probably created through heavy mass loss via fierce stellar winds and perhaps also major `` mini-supernova - like '' eruptions as happened to Eta Carinae around the 1830s - 1840s creating the lobes observed by the Hubble Space Telescope . The luminosities of the Pistol Star , Eta Carinae , and WR 102ka are all rendered somewhat uncertain due to heavy obscuration by galactic dust in the foreground , the effects of which must be corrected for before their apparent brightness can be reduced to estimate their total radiated power or bolometric luminosity . Both Eta Carinae and WR 102ka are believed likely to explode as supernovas or hypernovas within the next few million years . As is typical of such extremely massive and luminous stars , both have expelled a considerable portion of their initial mass , when originally formed , in dense , massive stellar winds . As WR 102ka lies near the Galactic Center , it is the more distant and heavily obscured of the two , and is essentially totally obscured in visible wavelengths . Thus it must be observed in longer wavelength infrared light , which is able to penetrate the dust . The Spitzer Space Telescope observed WR 102ka at wavelengths of 3.6 µm , 8 µm , and 24 µm on April 20 , 2005 . The observations were carried out by L. Oskinova , W. - R. Hamann , and A. Barniske of Potsdam University , Germany . WR 102ka was previously observed by the Two Micron All...  - Eta Carinae (abbreviated to  Carinae or  Car), formerly known as Eta Argus, is a stellar system containing at least two stars with a combined luminosity over five million times that of the Sun, located around 7500 light-years (2300 parsecs) distant in the constellation Carina. First recorded as a 4th-magnitude star, it brightened considerably over the period 1837 to 1856 in an event known as the Great Eruption. Eta Carinae became the second-brightest star in the sky between 11 and 14 March 1843 before fading well below naked eye visibility. It has brightened consistently since about 1940, peaking above magnitude 4.5 in 2014. Eta Carinae is circumpolar south of latitude 30°S, so it is never visible north of latitude 30°N.  - The Pistol Star is a blue hypergiant star, one of the most luminous known in the Milky Way. It is one of many massive young stars in the Quintuplet cluster in the Galactic Center region. The star owes its name to the shape of the Pistol Nebula, which it illuminates. It is located approximately 25,000 light years from Earth in the direction of Sagittarius. It would be visible to the naked eye as a fourth magnitude star if it were not for the interstellar dust that completely hides it from view in visible light.  - The Pistol Nebula is located in the constellation Sagittarius. It surrounds one of the most luminous stars known, the Pistol Star. Both are located 25,000 light years away from Earth in the Quintuplet cluster, near the center of the Milky Way galaxy. The nebula contains approximately 9.3 solar masses worth of ionized gas that was ejected by the star several thousand years ago. The nebula was named in the 1980s for its shape as seen in low resolution images that were available at the time. The Pistol Star, a luminous blue variable is 1.6 million times brighter than the Sun making it one of the most luminous stars in the Milky Way.  - 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 low Earth orbit (LEO) is an orbit around Earth with an altitude between (orbital period of about 88 minutes), and (about 127 minutes). Objects below approximately will experience very rapid orbital decay and altitude loss.    'wr 102ka' is related to which object entity through the relation of 'constellation'?  Choices: - carina  - leo  - ophiuchus  - sagittarius
A:
sagittarius