Musca

Musca is a small group of stars.

It looks like a tiny fly in the sky. It is the only bug in the stars.

Long ago, people gave it different names. Some called it a bee. Others called it a fly.

Many of its stars are bright and blue. These stars are very hot. They all came from the same place.

Some stars in this group are very big. One star is much larger than our Sun.

It is hard to see from the north. You must look south to find it.

It is a special part of the night sky.

Musca is a small group of stars in the southern sky.

It is the only official constellation that looks like an insect.

Long ago, people gave it many names. In 1603, a man named Johann Bayer called it Apis. This means "the bee." For two hundred years, people used that name. Later, a scientist named Lacaille called it the Southern Fly. Today, we simply call it Musca.

Many stars in Musca are bright and blue-white. Most of these stars belong to a group called the Scorpius–Centaurus association. This is a large group of stars that share a common origin. They move through the Milky Way together.

Some stars in this group are very special. Alpha Muscae is the brightest star in the group. It is a variable star, which means its brightness changes. It pulses every 2.2 hours. Another star, Epsilon Muscae, is a red giant. It is very large. It is 1,800 to 2,300 times brighter than our Sun.

Near Musca, you can also see the dark Coalsack Nebula.

Musca is a small constellation located in the deep southern sky.

It is a special part of the night sky because it is the only official constellation that depicts an insect. It covers about 138 square degrees of space. This means it takes up 0.335% of the entire night sky. Because it is so far south, it stays below the horizon for most people living in the Northern Hemisphere.

Many of the brightest stars in Musca belong to a group called the Scorpius–Centaurus association. This is a loose group of hot, blue-white stars. These stars appear to share a common origin and move together across the Milky Way. Some of these stars include Alpha, Beta, Gamma, Zeta2, and Eta Muscae. There is also a star called HD 100546. This blue-white star is surrounded by a complex disk of debris. This disk might contain a large planet or a brown dwarf.

Humans have been mapping this area for a long time. In 1597 or 1598, Petrus Plancius created the constellation. He used observations from explorers Pieter Dirkszoon Keyser and Frederick de Houtman. It first appeared on a celestial globe published in Amsterdam. In 1603, Johann Bayer included it in his atlas called Uranometria. He called the constellation Apis, which means "the Bee." People used that name for about 200 years. Later, a scientist named Lacaille renamed it to Musca Australis to avoid confusion.

Musca has many interesting stars with unique traits. Alpha Muscae is the brightest star in the constellation. It is a blue-white star that is 4,520 times as luminous as our Sun. It is also a variable star, which means its brightness changes. It pulses every 2.2 hours. Another star, Epsilon Muscae, is a red giant. This star is very large and 1,800 to 2,300 times brighter than the Sun. There are also two stars called Cepheid variables that you can see without a telescope.

Different cultures around the world have seen these stars in different ways. The Kalapalo people in Brazil called two stars "Ornate Hawk-Eagle's double flutes." In Australia, the Wardaman people saw the stars as a ceremonial boomerang. They also saw some stars as a headband and armbands. The Arrernte and Luritja peoples in central Australia used the stars to mark their camps. These stars connect the sky to the stories and lives of people on Earth.

Musca is a small constellation located in the deep southern sky. It is a unique part of our night sky because it is the only official constellation that depicts an insect. The constellation covers 138 square degrees of space. This means it accounts for 0.335% of the entire sky. Because of its position, it remains below the horizon for most observers living in the Northern Hemisphere.

The stars within Musca tell a story of shared origins and intense energy. Many of its brightest stars belong to the Scorpius–Centaurus association. This is a loose group of hot, blue-white stars. These stars appear to share a common origin and move together across the Milky Way. This group includes Alpha, Beta, Gamma, Zeta2, and likely Eta Muscae. One notable star in this group is HD 10056, a blue-white Herbig Ae/Be star. This star is surrounded by a complex debris disk. This disk contains a large planet or brown dwarf and perhaps a protoplanet.

Humanity has been mapping Musca for hundreds of years. The constellation was one of 12 created by Petrus Plancius. He used observations from explorers Pieter Dirkszoon Keyser and Frederick de Houtman. These men sailed on the first Dutch trading expedition to the East Indies. The constellation first appeared on a 35-cm celestial globe in 1598. It was published in Amsterdam by Plancius and Jodocus Hondius.

Names for the constellation have changed over time. In 1603, Johann Bayer included it in his atlas, Uranometria. He called it Apis, which is Latin for "the Bee." This name was used for about 200 years. Later, the French astronomer Nicolas Louis de Lacaille renamed it. He first called it la Mouche in 1756. He later Latinized it to Musca Australis, or the Southern Fly. He did this to distinguish it from a discarded constellation called Musca Borealis. Today, we simply call it Musca.

Different cultures have found deep meaning in these stars. The Kalapalo people of Brazil called two stars "Ornate Hawk-Eagle's double flutes." In Australia, the Wardaman people saw the stars as a ceremonial boomerang. These stars were part of the Central Arena, a sacred area near the constellation Crux. They also saw the stars as a ceremonial headband and armbands. The Arrernte and Luritja peoples used the stars to divide their camps. These traditions show how the sky connects to human culture.

The stars of Musca exhibit incredible physical variety. Alpha Muscae is the brightest star in the constellation. It is a blue-white star that is 4,520 times as luminous as the Sun. It is also a Beta Cephei variable, meaning it pulses every 2.2 hours. Gamma Muscae marks the fly's tail. It is a slowly pulsating B star that varies over 2.7 days. Epsilon Muscae is a massive red giant. It has expanded to 130 times the diameter of the Sun. It is also between 1,800 and 2,300 times more luminous than the Sun.

Some systems in Musca involve extreme physics. Theta Muscae is a triple star system located about 7,500 light-years away. It contains a Wolf–Rayet star, which is a very luminous type of star. The combined luminosity of this system is likely over a million times that of the Sun. Another system, TU Muscae, is an overcontact binary. This means the two hot, blue stars are actually touching each other. Finally, the system GQ Muscae shows how stars interact. A white dwarf pulls material from a companion star through an accretion disc. When enough material builds up, the star erupts in a nova.