Max Planck Institute for Astronomy

Geoffrey Andama was a mentee in the first round of the ARTEMIS program in 2023. Since September 2025, he has headed the Max Planck-Humboldt Research Unit at Muni University in Uganda. The new unit is dedicated to developing astrophysics and astronomy across Africa. In this interview, Andama talks about his path into science, the role of mentoring, and his vision for astronomy on the continent.

New astronomical survey captures previously unknown growing pains in the lives of planets

A look back at a year of research with many highlights

Astronomers have repeatedly observed events near a distant star that mirror processes from the early solar system’s planet-forming era

SPHERE’s images of dust around distant stars provide a glimpse of asteroids and comets in other solar systems

Is there a planet like ours in the vastness of space – not too big, not too small, not too hot, not too cold, made of rock and with an atmosphere that supports life? Laura Kreidberg and her team at the Max Planck Institute for Astronomy are searching for a second Earth with the James Webb Space Telescope. The most surprising thing is what they are not finding.

The galaxies we see around us have had a turbulent past, full of collisions, plentiful gas flows, and bursts of increased star formation. Our home galaxy is no exception. A team led by Hans-Walter Rix at the Max Planck Institute for Astronomy is reconstructing the Milky Way’s history in a process that resembles archaeological research.

Six months after its launch, the James Webb telescope has delivered its first images, revealing fascinating insights into distant galaxies as well as turbulent scenarios encompassing the birth and death of stars. The space observatory has also captured the spectra of exoplanets. The Max Planck Institute for Astronomy in Heidelberg was involved in building the instruments.

Two years ago, a new department opened at the Max Planck Institute for Astronomy in Heidelberg in which researchers study the atmospheres of extrasolar planets. Its young director, Laura Kreidberg, has made a name for herself with some of the first observations of these worlds and is one of the lucky ones who will get to observe with the new James Webb Space Telescope.

The chemistry of a star contains valuable information such as its history or affiliation with a particular stellar population. But accurate detection of abundances of chemical elements based on spectral fingerprints require highly sophisticated methods. Maria Bergemann from the Max Planck Institute for Astronomy in Heidelberg has set new standards here.

We have identified rapidly moving stars in the Omega Centauri star cluster, indicating the presence of a black hole at its centre with a mass of at least 8,200 solar masses. While astronomers had long assumed such intermediate-mass black holes exist, there has been a lack of reliable observations to confirm it. This discovery also establishes that Omega Centauri is the core region of a galaxy absorbed by the Milky Way billions of years ago. Stripped of its outer stars, the galactic core has since undergone little further evolution.

Water is essential for life, at least on Earth. The question of its origin is therefore central to the chance of life on other Earth-like planets. Through observations with the James Webb Space Telescope, we have now found evidence for a mechanism that supplies potentially habitable planets with water during their formation. The JWST/MIRI data indicate a substantial reservoir of water in the central region of a planet-forming disk of gas and dust around the young star PDS 70, where Earth-like planets may be forming.

Through observations of the exoplanet WASP-121 b with the Hubble Space Telescope, we have studied the atmospheric conditions on the night side of a hot Jupiter in detail for the first time. Incorporating measurements from the dayside, we determined the temperature profile in the stratosphere and an unusual water cycle between the two hemispheres. This study is a significant step towards deciphering the global matter and energy cycles in the atmospheres of exoplanets.

From the data of the THOR survey led at the Max Planck Institute for Astronomy (MPIA), we have identified one of the longest known structures in the Milky Way, stretching some 3900 light years and consisting almost entirely of atomic hydrogen gas. This filament, called Maggie, could represent a link in the stellar matter cycle. Our analysis suggests that locally the atomic gas binds to molecular hydrogen there. Compressed in large clouds, this material ultimately forms stars.

We have successfully tested the performance of a new method for determining the masses of extreme black holes in quasars, called spectroastrometry, for the first time through observations. It measures radiation coming from gas in the vicinity of supermassive black holes. Compared to other weighing techniques, it is relatively straightforward and efficient to perform using modern large telescopes. Its high sensitivity makes it possible to study the surroundings of luminous quasars and supermassive black holes in the early Universe.