Hydrogen Line in Astronomy | UPSC

The hydrogen line is a crucial tool in astronomy for studying objects from distant stars to potential extraterrestrial intelligence.

Hydrogen atoms emit a specific radio wave when a proton and electron within it flip their spins.

This radio wave, with a wavelength of 21 centimeters, allows astronomers to detect clouds of hydrogen gas in space.

By studying the hydrogen line emission, astronomers were able to map our Milky Way galaxy for the first time.

The line's simplicity makes it a potential tool for sending messages across space for potential alien civilizations to detect.