Astronomers have captured the most detailed map yet of the center of the Milky Way. The image shows cold gas clouds that contain the raw material for stars and planets. The discovery may help scientists understand how our solar system formed.
Researchers produced the map after a four-year international project using the powerful Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. The telescope consists of more than 50 radio antennas placed high in the Andes Mountains.
Scientists say this is the first time they have mapped the entire region of cold gas at the galaxy’s center. Previous studies only focused on small areas. This new survey provides a complete picture of the region.
A Map of the Galaxy’s Central Gas
The central region of the Milky Way is called the Central Molecular Zone. It contains dense, hot, and turbulent clouds of gas.
At the very core lies Sagittarius A*, a supermassive black hole with a mass about four million times larger than the Sun. Its strong gravity pulls nearby material inward. Scientists compare the process to water swirling toward a drain in a bathtub.
The new map focuses on molecular gas. This gas includes hydrogen, carbon monoxide, and many complex compounds. Over time, these clouds collapse under gravity and form new stars and planetary systems.
Researchers say studying this region will help them understand where and when stars begin to form.
A Different Kind of Milky Way Image
The colorful image does not show the galaxy as human eyes would see it. Instead, scientists used spectroscopy to detect light from specific molecules.
This technique measures tiny changes in light frequencies caused by the Doppler Effect. The same principle explains why an ambulance siren changes pitch as it moves closer or farther away.
By applying this method, scientists can determine whether gas clouds move toward or away from Earth. They can also measure how fast the gas travels.
The colors in the map represent different molecules and gas motions. Red areas may show regions where massive gas clouds collide. Blue areas indicate calmer regions where gas moves more slowly.
Clues About the Origins of Stars and Life
The survey detected more than 70 molecular signatures. These include simple molecules and complex organic compounds such as methanol and ethanol.
Some of these molecules may act as precursors to amino acids, which are essential building blocks of proteins.
Scientists believe the conditions near the Milky Way’s center resemble those in early galaxies billions of years ago. By studying this region, astronomers may learn how stars, planets, and even life-forming molecules developed in the universe.
A Massive Global Collaboration
The project involved around 160 scientists from institutions around the world. Researchers had to combine thousands of observations to create the final map.
Experts say modern astronomy now depends on large international teams. Engineers, telescope operators, and scientists all played a role in making this discovery possible.
