How to Characterize Habitable Worlds and Signs of Life

TL;DR

This paper reviews how upcoming telescopes will enable the detection and characterization of habitable exoplanets and signs of life, leveraging our understanding of Earth's biosignatures and planetary habitability.

Contribution

It provides a comprehensive overview of current challenges and future prospects in identifying habitable worlds and biosignatures using next-generation telescopes.

Findings

Next-generation telescopes will enable atmospheric characterization of nearby habitable exoplanets.

Current telescopes are insufficient for detailed habitability assessments.

Advances in technology will revolutionize the search for extraterrestrial life.

Abstract

The detection of exoplanets orbiting other stars has revolutionized our view of the cosmos. First results suggest that it is teeming with a fascinating diversity of rocky planets, including those in the habitable zone. Even our closest star, Proxima Centauri, harbors a small planet in its habitable zone, Proxima b. With the next generation of telescopes, we will be able to peer into the atmospheres of rocky planets and get a glimpse into other worlds. Using our own planet and its wide range of biota as a Rosetta stone, we explore how we could detect habitability and signs of life on exoplanets over interstellar distances. Current telescopes are not yet powerful enough to characterize habitable exoplanets, but the next generation of telescopes that is already being built will have the capabilities to characterize close-by habitable worlds. The discussion on what makes a planet a habitat and how to detect signs of life is lively. This review will show the latest results, the challenges of how to identify and characterize such habitable worlds, and how near-future telescopes will revolutionize the field. For the first time in human history, we have developed the technology to detect potential habitable worlds. Finding thousands of exoplanets has taken the field of comparative planetology beyond the Solar System.