2025年3月28日 · A biosignature is any characteristic, element, molecule, substance, or feature that can be used as evidence for past or present life. Technosignatures show signs of technological life and would be evidence of intelligent alien life.

2005年4月21日 · The meaning of BIOSIGNATURE is something (such as a chemical compound, isotope, or cellular component) that indicates or suggests the presence of a biological process indicative of life. How to use biosignature in a sentence.

2018年9月8日 · A biosignature (sometimes called chemical fossil or molecular fossil) is any substance – such as an element, isotope, molecule, or phenomenon – that provides scientific evidence of past or present life.

A biosignature is an object, substance, and/or pattern whose origin specifically requires a biological agent (Des Marais et al., 2008). The usefulness of a biosignature is determined not only by the probability that life produced it, but also by the …

2024年8月7日 · A potential biosignature is a substance or structure that might have a biological origin but requires more data or further study before reaching a conclusion about the absence or presence of life. As the name indicates, a biosignature is a sign of life.

In life detection, examples of relevant criteria to judge a biosignature might be the likelihood of finding it in biological systems, the ability to survive in the target environment in quantities sufficient for detection, and the existence of abiotic processes producing the biosignature.

2018年10月10日 · While novel biosignature identification expands the field of search opportunities, a comprehensive framework for assessing biosignatures in the context of their environment, and the use of multiple lines of evidence, allows progressively increasing confidence in the ability to detect life.

2024年5月21日 · A biosignature is a chemical or physical process that can be detected at a distance and indicates the presence of living organisms in a particular region. The concept is often used in the field of astrobiology, which is a branch of biology that searches for life outside of the land, air, and sea environments of the Earth.

2023年11月10日 · The concept of a biosignature is widely used in astrobiology to suggest a link between some observation and a biological cause, given some context. The term itself has been defined and used in several ways in different parts of the scientific community involved in the search for past or present life on Earth and beyond.

2023年11月10日 · We show that the new definition yields intuitively satisfying judgments when applied to historical biosignature claims. We also reaffirm the importance of multidisciplinary work on abiotic mimics to narrow the gap between the detection of a biosignature and a confirmed discovery of life.

2025年3月26日 · Plant pigments themselves which have been proposed as a surface biosignature. Observed in the near infrared portion of the electromagnetic spectrum, the pigment chlorophyll — the central player in the process of photosynthesis — shows a sharp increase in reflectance at a particular wavelength.

2025年3月28日 · NASA -supported researchers have assessed the capabilities of the James Webb Space Telescope () to search for gases in planetary atmospheres that could be signs of life. The team of researchers examined a comprehensive suite of biosignatures gases that are thought to have been present on Earth at different times throughout the planet’s history.

6 天之前 · The desired properties of an ideal biosignature are discussed, along with considerations of the environmental context and chemical disequilibria in the assessment of biosignatures in diverse environments. A discussion of current state-of-the-art and future prospects in the search for habitable conditions and biosignatures on exoplanets is ...

2017年11月9日 · To identify life on other worlds, scientists will have to know what to look for, and what to ignore. Before we go looking for signs of life on other planets, we might want to know …

While novel biosignature identification expands the field of search opportunities, a comprehensive framework for assessing biosignatures in the context of their environment, and the use of multiple lines of evidence, allows progressively increasing confidence in the ability to detect life.

2019年8月22日 · In the search for extraterrestrial life in the Universe, it is critical to determine what constitutes a biosignature across multiple scales, and how this compares with “abiosignatures” formed by nonliving processes.

Explain the concept of a biosignature and describe Earth’s biosignatures; Discuss how biosignatures can be searched for in exoplanetary atmospheres; Explain the concept of technosignatures and describe Earth’s main technosignatures; Discuss some technosignatures that astrobiologists search for from other planets

2024年2月7日 · We show that the new definition yields intuitively satisfying judgments when applied to historical biosignature claims. We also reaffirm the importance of multidisciplinary work on abiotic mimics to narrow the gap between the detection of a biosignature and a confirmed discovery of life.

2023年8月29日 · Biosignatures are a multifaceted concept that plays a significant role in several scientific and practical fields. They offer a way to detect and study life in environments ranging from Earth to other celestial bodies.

A biosignature denotes the presence of a substance or phenomenon that is indicative of life, past or present. Biosignature is a term defined in the context of the field of astrobiology and it represents evidence of life in the context of the system where it is being detected.

2024年9月5日 · Biosignatures are scientific indicators, such as specific chemicals, isotopic ratios, or physical structures, that suggest the presence or past existence of life on a planetary body. These markers, essential for astrobiology, help scientists search for life beyond Earth, particularly in places like Mars and the moons of Jupiter and Saturn.