Didier Queloz

Didier is a man who looks at stars.

He found a new world far away. This world is a planet in space. It moves around a star like our Sun.

He found this planet by watching a star. The planet's pull made the star move a little bit. This helped him see the new world.

He won a very big prize for his work. This prize is called the Nobel Prize.

Now, he looks for worlds like our Earth. He wants to know if life lives there.

It is exciting to find new things in space!

Didier Queloz is a Swiss astronomer. He studies the stars and the worlds around them.

In 1995, he and Michel Mayor made a big discovery. They found 51 Pegasi b. This was the first exoplanet found near a star like our Sun. An exoplanet is a planet that orbits a star outside our solar system.

They found this planet using a special tool. This tool measures radial velocity. This is a way to see how a star moves. The planet's pull makes the star wobble a little bit. This wobble tells scientists a planet is there. For this work, they won the 2019 Nobel Prize in Physics. This is one of the highest honors in science.

Now, Queloz looks for worlds like Earth. He wants to know if life can exist there. He helps lead the CHEOPS mission. This is a space telescope that measures the size of planets. He also leads a center that studies how life begins. He hopes to find signs of life in the deep reaches of space.

Didier Queloz is a famous Swiss astronomer. He spends his life studying the stars and the worlds around them.

His work changed how we see the entire universe. He helped start what scientists call the exoplanet revolution. This means we now know there are many planets outside our own solar system. He wants to find out if life exists on these distant worlds. This is a huge and exciting job for any scientist.

In 1995, Queloz made a history-making discovery with Michel Mayor. They found a planet named 51 Pegasi b. This was the first exoplanet found orbiting a star like our Sun. They found it by watching for a tiny wobble in the star. This wobble is caused by the pull of the orbiting planet. They used a tool called a spectrograph to see this movement. This tool measures something called radial velocity. Radial velocity is the speed at which a star moves toward or away from us.

Queloz grew up and studied in Switzerland. He went to the University of Geneva to learn about physics and astronomy. He earned his PhD degree in 1995 from that same school. Michel Mayor was his teacher and advisor during his studies. Since then, he has worked at many great places. He is a professor at the University of Cambridge in the UK. He is also a professor of physics at ETH Zurich.

His career is full of amazing facts and big awards. In 2019, he won the Nobel Prize in Physics. He shared this prize with Michel Mayor and Jim Peebles. He also won the Wolf Prize in Physics in 2017. He has helped find hundreds of different planets. Some of these planets are called Hot Jupiters because they are huge and hot. He also found Gliese 436 b, which is a Neptune-sized planet.

Today, Queloz uses many tools to study the cosmos. He helps lead the CHEOPS space mission to measure planet sizes. He also works with the TRAPPIST-1 system to look for life. He wants to find the "abiogenesis zone." This is a place where the right chemistry might allow life to start. His work links physics and biology together. He hopes to understand how life begins on planets far away.

Didier Queloz is a prominent Swiss astronomer whose research has fundamentally changed our understanding of the cosmos. He is a central figure in the "exoplanet revolution," a period of massive discovery regarding worlds outside our solar system. Currently, he holds several prestigious positions. He is the Jacksonian Professor of Natural Philosophy at the University of Cambridge. He is also a fellow of Trinity College, Cambridge. Additionally, he serves as a professor of physics at ETH Zurich. His work spans many disciplines, including physics, chemistry, and biology.

In 1995, Queloz and his doctoral advisor, Michel Mayor, made a landmark discovery. They identified 51 Pegasi b, which was the first exoplanet found orbiting a Sun-like star. This star is known as 51 Pegasi. The planet is classified as a "Hot Jupiter," meaning it is a giant planet that orbits very close to its star. To find this world, they used a method involving stellar radial velocity. This technique measures the small, periodic changes in a star's movement. These changes are caused by the gravitational pull of an orbiting planet.

This detection was made possible through advanced technology and clever science. The team used a new type of spectrograph called ELODIE. This instrument was installed at the Haute-Provence Observatory. The spectrograph allowed them to observe the Doppler effect. The Doppler effect helps scientists detect the tiny wobbles in a star's velocity. Queloz also developed new algorithms to help separate planetary signals from stellar activity. This activity refers to natural changes on the star's surface that can look like a planet. His work in this area set the foundation for modern precision spectroscopy.

Throughout his career, Queloz has led the development of many important astronomical tools. In 2000, he served as a project scientist for the development of HARPS. This is a high-precision spectrograph for the ESO 3.6m telescope. It was commissioned in 2003 and became a global standard for Doppler spectroscopy. He also led the installation of CORALIE on the 1.2-metre Leonhard Euler Telescope. These instruments allowed him to detect planets in the southern hemisphere. His work with these tools has led to the detection of hundreds of planets.

Queloz has expanded his research to include transiting planets. A transit occurs when a planet passes directly in front of its star from our perspective. By combining transit data with radial velocity measurements, scientists can learn much more. They can measure both the mass and the radius of a planet. This allows them to calculate the bulk density, which is the planet's average density. Knowing the density helps scientists understand if a planet is rocky or gaseous. For example, he helped find the first planet with a density similar to a rocky planet, known as COROT-7b.

His scientific achievements have earned him the highest honors in the world. In 2019, he was awarded the Nobel Prize in Physics. He shared this prize with Michel Mayor and Jim Peebles. The Nobel Committee recognized them for discovering an exoplanet orbiting a solar-type star. This discovery helped us understand the evolution of the universe. In 2017, he also received the Wolf Prize in Physics for his planet discoveries. Earlier, in 2011, he and Mayor won the BBVA Foundation Frontiers of Knowledge Award.

Today, Queloz focuses on the search for life and habitability in the universe. He is the founding director of the Center for the Origin and Prevalence of Life at ETH Zurich. He also directs the Leverhulme Centre for Life in the Universe at Cambridge. This center brings together experts in astrophysics, chemistry, and biology. One of his major research areas is the "abiogenesis zone." This is a term describing the minimum conditions needed for the origins of RNA precursors on exoplanets. He is also involved in the CHEOPS space mission, which measures exoplanet radii.

His recent work includes studying the TRAPPIST-1 system, which is a very interesting planetary system. He also works on the SPECULOOS project to find Earth-sized planets around ultra-cool dwarf stars. Through the Terra Hunting Experiment, he uses the HARPS-3 spectrograph to look for Earth analogues. These are planets that are very similar to our own Earth. By studying these distant worlds, Queloz hopes to answer the biggest question of all: are we alone in the universe? His research connects the physics of stars to the very beginnings of life.