What galaxy is Cancer in, and how far away is our Earth?

Cancer. Cancer.

Cancer, west of Leo, north of the head of the serpent, is the darkest of the zodiac signs, and the brightest star in the constellation is only, and the shape of the crab is not visible at all, perhaps because Hercules had already smashed it with a blow. That's it, it's still clinging to the long snake, embarrassed!

In the vicinity of the δ star in the constellation Cancer** (or between the two bright stars of Regulus and Gemini in the constellation Leo), people with good eyesight can see a small cloud of white mist, which was called "corpse qi" in ancient China, and it is described in the book: "If the cloud is not a cloud, if the star is not a star, it is just to see the air." It wasn't until the invention of the telescope that people observed that it was originally a star cluster, known astronomically as a "beehive cluster".

There are more than 200 members of this star cluster, which are 520 light-years away.

In astronomy, star clusters are divided into two categories, one is the "globular cluster" in the constellation Hercules. These clusters are irregularly shaped and are generally distributed on silver disks. Astronomers have discovered more than 1,000 open clusters in the Milky Way, and they estimate that there are more than 10,000 open clusters in the entire galaxy.

Cancer, one of the zodiac constellations, astronomical symbols . It is a dim and small constellation, with Gemini to the west, Leo to the east, Lynx to the north, and Canis Minors and Hydra to the south. Features: Cancer 55 has been confirmed to have two planets with a mass of about 5 times that of Jupiter.

The Deep-Sky Celestial M44 Ghost Cluster (or Beehive Cluster) is located in the middle of the constellation Cancer, and to the naked eye appears to be a blurry white mist. Another deep-sky object, M67, is one of the oldest star clusters in the sky, more than a billion years old. Located west of Liusu Zengsan ( ), it is a large, faint open star cluster.

MythologyIn Greek mythology, Cancer represents a small crab that tries to hinder the hero Hiracles from killing the Hydra (Hydra), but is trampled on by a flat foot. Astrology In astrology, the house of Cancer (June 21 July 22) corresponds to the sign of Cancer. The house of Cancer, along with the house of Scorpio and the house of Pisces, is related to water in the four elements, so they are called the water house.

Its opposite star house is the Capricorn house.

In the solar system, the farthest planet from Earth is Pluto. Among the celestial bodies that orbit the Sun directly, Pluto ranks 9th in volume and 10th in mass. Pluto is the largest outer Neptune object, second only to Eris in a discrete disk.

Like other Kuiper Belt objects, Pluto is composed mainly of rock and ice and has a relatively small mass, only 1 6 of the mass of the Moon and 1 3 of the Moon's volume. Pluto's orbital eccentricity and inclination are high, with a perihelion of 30 AU (4.4 billion km) and an aphelion of 49 AU (7.4 billion km).

Pluto periodically enters the inner side of Neptune's orbit, but does not collide due to its orbital resonance with Neptune. At average distance, it takes hours for the sun's rays to reach Pluto.

Pluto mass and size.

Pluto has a diameter of kilometers and a mass of (, which is the Earth's of the Moon. Its surface area is km2, which is about the same as that of Russia. It has a surface gravity of g (1 g for the Earth and g for the Moon).

Since Pluto is so faint and small, its size cannot be determined long after its discovery.

It was first estimated to be 6,600 km in diameter, but in 1949 it was changed to 10,000 km. In 1950, Gerard Kuiper revised its diameter to 6,000 kilometers with the newly built 5-meter telescope. In 1965, Gerard Kuiper used Pluto's occultation of a dark star to set the upper limit of the diameter at 5,500 kilometers.

In 1977, frozen methane was discovered on the surface of Pluto, and its albedo shrank to 2,700 kilometers in diameter.

Because in the known universe, the universe is constantly changing and expanding, and there are countless planets, so if you want to find the farthest planet in it, it is still not possible to look at the current science and technology, but at present, human beings have found the galaxy farthest from the earth, named Abell1835 ir1916.

There are so many planets in the known universe that some of them don't even have names. The farthest known galaxy from Earth is a small galaxy 13.2 billion light-years away, with the group of galaxies named Abell 1835 located between Earth and the newly discovered galaxy.

Finally, scientists named this galaxy farthest from Earth Abell 1835 IR1916, which is the farthest galaxy from Earth explored by humans in 2004, and this once farthest galaxy is also 13.2 billion years old, very close to and similar to the first group of galaxies in the universe.

Because galaxies are so far away from the Earth that there is no way to predict the planets that exist inside, and the universe is constantly changing and expanding, the farthest planet from the Earth cannot be found at present. Of course, in the solar system, the farthest star from Earth is the Sun, and the farthest planet from Earth is Uranus.