Serpens

The stars make a snake in the sky.

This snake is special. It is split into two parts. One part is the head.

The other part is the tail.

A man holds the snake. He is a different group of stars. The brightest star is in the head. It is a big red star. You can see it with your eyes.

The sky has many pretty things there too. There are clouds of gas and bright stars. It is a wonderful sight to see.

Serpens is a group of stars in the sky.

It is a very special constellation. It is the only one split into two parts. One part is the head, called Serpens Caput.

The other part is the tail, called Serpens Cauda.

A man holds the snake. This man is a group of stars called Ophiuchus.

The brightest star is in the head. It is a red giant named Alpha Serpentis. You can see it easily with your eyes.

Serpens also has many deep-sky objects. These are things far away in space. You can find the Eagle Nebula there.

It has famous dust clouds called the Pillars of Creation. There is also a star cluster called Messier 5.

You might even see Hoag's Object. This is a rare ring galaxy. These objects make the sky very busy and bright. Serpens is the 23rd largest constellation in the sky.

Serpens is a unique group of stars in the northern sky.

Most constellations look like one single shape. Serpens is different because it is split into two separate parts. One part is the head, called Serpens Caput.

The other part is the tail, called Serpens Cauda.

The constellation Ophiuchus, the Serpent-Bearer, sits right between these two halves. It looks like the man is holding the snake. This makes Serpens the only modern constellation divided into two disconnected regions. It is the 23rd largest constellation out of the 88 known ones.

Many amazing things happen within these star boundaries. In the head, the brightest star is Alpha Serpentis. This is a red giant star named Unukalhai.

It is easy to see even if there is light in your city. Near this star, you can find a cluster of stars called Messier 5.

In the tail, the Milky Way path passes through the area. This brings many deep-sky objects to the region. You can find the Eagle Nebula here. This nebula contains the famous Pillars of Creation. These are three large clouds of dust. They were made famous by pictures from the Hubble Space Telescope.

People have looked at these stars for a very long time. The astronomer Ptolemy listed Serpens in the 2nd century. In Greek myths, the snake belongs to a healer named Asclepius. Legend says he learned to bring life back using a special herb. This is why snakes are symbols of rebirth. In Chinese astronomy, these stars told a different story. They represented a wall around a marketplace called Tianshi. Other stars in the tail represented jewel shops and a market office.

There are many special objects to study in Serpens. You can find Hoag's Object, which is a very rare ring galaxy. There is also the Red Square Nebula. This is one of the few objects that looks like a square. Scientists also study the Seyfert's Sextet, a very dense cluster of galaxies.

In the head, the star Delta Serpentis is actually a system of four stars. Another system, PSR B1534+11, has two neutron stars. This system helped scientists test Albert Einstein's ideas about space. Even the star VY Serpentis is interesting because its brightness changes over time.

Looking at Serpens helps us understand how the universe works. The way the stars move shows us how gravity pulls on things. The different types of stars, like red giants, show how stars age. For example, Alpha Serpentis is a large, older star. Other stars, like the ones in the Eagle Nebula, are places where new stars are born. Seeing these shapes in the sky connects us to ancient people. They used the same stars to tell stories and track time. Today, we use telescopes to see the deep secrets hidden in the serpent's tail.

Serpens is a unique constellation located in the northern celestial hemisphere. It is one of the 88 modern constellations officially designated by the International Astronomical Union.

Most constellations appear as a single, continuous shape in the sky. However, Serpens is the only modern constellation split into two non-contiguous parts. These two sections are Serpens Caput, which means "Serpent Head," and Serpens Cauda, which means "Serpent Tail."

The head is located to the west, while the tail is to the east. This separation occurs because the constellation Ophiuchus, the "Serpent-Bearer," lies directly between the two halves. In many artistic drawings, the body of the snake is shown passing behind Ophiuchus.

The structure of Serpens is defined by specific celestial boundaries. The head, Serpens Caput, is bounded by a 10-sided polygon. Its borders are set by Libra to the south, Virgo and Boötes to the west, and Corona Borealis to the north. To the east, it meets Ophiuchus and Hercules.

The tail, Serpens Cauda, is larger and defined by a 22-sided polygon. It is bordered by Sagittarius to the south, Scutum and Aquila to the east, and Ophiuchus to the north and west. Covering a total of 636.9 square degrees, Serpens ranks as the 23rd largest constellation. It is most visible during the summer months in the Northern Hemisphere.

Many fascinating stars reside within the Serpent's Head. The brightest star in the entire constellation is Alpha Serpentis, also known as Unukalhai.

This star is a red giant with an apparent magnitude of 2.63. It is bright enough to be seen with the naked eye even in areas with light pollution. Nearby, you can find the globular cluster Messier 5. Other notable stars include Lambda Serpentis, which is similar to our Sun, and the binary star system Psi Serpentis. The head also contains variable stars like R Serpentis and the cool red giant Tau4 Serpentis.

The Serpent's Tail is rich with deep-sky objects because the Milky Way's galactic plane passes through it.

One of the most famous features is the Eagle Nebula, also known as IC 4703. This nebula contains the Pillars of Creation, which are three massive dust clouds.

These pillars became world-famous through images captured by the Hubble Space Telescope. Another striking feature is Westerhout 40, a massive region where new stars are forming. This region consists of a molecular cloud and an H II region.

The tail also hosts the Red Square Nebula, a rare object that appears square in shape.

Astronomy enthusiasts can also find extragalactic objects within these boundaries. Seyfert's Sextet is one of the densest known galaxy clusters.

Arp 220 is a famous example of an ultraluminous infrared galaxy.

Perhaps most unusual is Hoag's Object, a very rare type of ring galaxy. These distant objects allow scientists to study the structure and evolution of the universe far beyond our own galaxy.

History shows that different cultures viewed these stars through different lenses. The 2nd-century astronomer Ptolemy included Serpens in his list of 48 constellations. In Greek mythology, the snake is linked to the healer Asclepius. Legend says he used a special herb to revive a snake, which inspired his own healing abilities. In Chinese astronomy, the stars represented a marketplace called Tianshi. Some stars in the tail represented jewel shops or a market office. Babylonian astronomers also had their own serpent figures, such as the horned serpent Bašmu.

Modern science uses Serpens to test fundamental laws of physics. The system PSR B1534+11 consists of two neutron stars, one of which is a pulsar.

By studying this system, scientists were able to test Albert Einstein's theory of general relativity. The observations validated the theory's predictions to within 0.2%. Additionally, the study of stars like VY Serpentis helps astronomers understand how stellar brightness changes over long periods. Through these diverse objects, Serpens serves as a vital laboratory for understanding stars, galaxies, and the laws of gravity.