Piergiovanni Salimbeni

Independent Journalist

Piergiovanni Salimbeni is an independent journalist registered with the Professional Order of Journalists of Lombardy. He began his journalism career in 1997 with the astronomical magazine Nuovo Orione. He graduated from the State University of Milan, where he completed a thesis on the impact of electromagnetic pollution and the antennas of Vatican Radio. He lives in the province of Varese with his wife and their two daughters.

For the past 15 years, Piergiovanni has been a leading voice in the sports optics and astronomy sectors. He writes a regular column for the tourism magazine Itinerari e Luoghi*and occasionally contributes to various nature, hunting, astronomy, and nautical magazines.

All articles by Piergiovanni Salimbeni

Astronomy Picture of the Day

2026-04-03

Caught in the Web: Visualization of a Black Hole Merger in the Tarantula Nebula

Image Credit: Carl Knox

How can we see what is invisible? Black holes are not easy to see in the dark cosmic night, but astronomers can find them by analyzing their gravitational effects on matter, light and spacetime. The featured image shows an illustration that combines a simulation of a black hole binary system in its final "death-dance" with an astrophotography image of the Tarantula Nebula in the background. Even though black holes don't emit light, they distort the path of light rays, acting like a gravitational lens. As a result, the nebula appears extremely distorted, forming Einstein rings and multiple images. Tarantula Nebula lies in the Large Magellanic Cloud, a dwarf galaxy that is one of the satellite galaxies of the Milky Way, 160,000 light-years away. That is more than 1,000 times closer than any of the binary black hole mergers detected so far. We'll probably never detect a merger so close to home!