The new tool that will peek into distant worlds and search for clues to extraterrestrial life
Scientists are nearing the operation of a new device called "Henrietta," installed on a telescope in Chile, designed to analyze the atmospheric composition of exoplanets. Researchers hope this will help them understand conditions in worlds outside our solar system and search for substances that might indicate potential habitability.
Scientists are nearing the operation of a new device that may allow us to learn much more about distant planets. The device, called "Henrietta" and installed on a telescope in Chile, is designed to analyze the composition of the atmosphere — the layer of gases surrounding a planet. Through it, researchers hope to understand what conditions exist in worlds outside the solar system and, among other things, search for materials that may assist in examining the big question: do conditions exist there that could be suitable for life?
Scientists have already discovered thousands of planets outside our solar system. The problem is that knowing a planet exists is one thing, while understanding what this world is really like is something else entirely. Until now, scientists have relied on parameters like size and mass to study them, but these data points do not tell the whole story.
Dr. Jason Williams, who leads the scientific and technical side of the "Henrietta" project, explained this using the example of Earth and Venus:
"Mass and size can only tell you up to a certain limit. If you measured Earth and Venus this way, you would think they are almost the same planet. But we know that their atmospheres — and the conditions in them — are completely different."
In other words, two planets can be similar in size and weight, yet the conditions on them can be entirely different.
The device is not designed to reach these planets or photograph their surfaces up close. Instead, it analyzes the light reaching us from the system where the planet is located. When a planet transits in front of its host star, some of the light passes through the layer of gases surrounding it. The substances found in the atmosphere leave a kind of "fingerprint" in the light. "Henrietta" is designed to break down this light and search for those fingerprints. This way, researchers can attempt to identify materials like water vapor, carbon dioxide, and methane to learn more about the conditions prevailing on the planet.
At the same time, the discovery of water, methane, or other substances is not definitive proof of life, as these materials can also be created through non-biological processes. However, atmospheric data allows scientists to better understand the nature of the world they are researching and identify planets worth investigating in greater depth. Simply put, instead of just knowing "there is a planet there," scientists want to start answering the question, "what kind of place is this?"
This is a highly complex task because the information arriving from the atmosphere of a distant planet is extremely weak. Even a small change in the temperature of the device or a tiny movement in its parts could affect the measurements. Therefore, a special system was built for "Henrietta" to maintain the stability of the device and perform adjustments in real time, compensating for temperature changes and mechanical movements that could harm the accuracy of the measurements.
