Knowledge Tree
solar system
Facts (36)
Sources
Planetary protection: an international concern and responsibility frontiersin.org May 29, 2023 5 facts
claimUnder Articles VI and IX of the Outer Space Treaty, States Parties are responsible for ensuring that national activities, whether governmental or private, avoid harmful contamination of explored Solar System objects and avoid hostile changes to the Earth's environment.
claimPlanetary protection standards provide technical requirements to limit biological and molecular contamination of explored Solar System bodies and to protect Earth from harmful biological contamination in returned samples.
claimThe COSPAR Panel on Planetary Protection (PPP) regularly reviews peer-reviewed scientific research to adapt planetary protection policies and category assignments for Solar System bodies, with the goal of enabling rather than prohibiting Solar System exploration.
claimIn-situ and observational data suggest that habitable conditions may exist on Mars and within the sub-surface oceans of icy moons in the Solar System, indicating these environments may have been conducive to the emergence of life.
quoteNASA-STD-8719.27 states that NASA standards aim to "provide technical requirements to protect and enable current and future scientific investigations by limiting biological and relevant molecular contamination of Solar System bodies through exploration activities and protecting the Earth’s biosphere by avoiding harmful biological contamination carried on returning spacecraft."
Life on the Edge: Bioprospecting Extremophiles for Astrobiology link.springer.com May 19, 2023 4 facts
measurementAs of 2023, scientists have discovered nearly 200 planets and satellites within the solar system and more than 5,000 exoplanets orbiting stars in the universe.
claimExamining the exospheres of moons in the Solar System can provide insights into the origins of life, the resources necessary for life, and the differences between planetary bodies.
referenceChou et al. (2021) published 'Planetary mass spectrometry for agnostic life detection in the solar system' in Frontiers in Astronomy and Space Sciences, discussing methods for detecting life without prior assumptions.
claimEuropa is considered one of the most promising locations in the solar system for discovering currently habitable environments due to strong evidence of liquid water beneath its icy crust.
Do Extremophiles on Earth Mean That Life Is Common in the Galaxy ... reasons.org Nov 22, 2019 4 facts
imageFigure 2, titled 'Habitats of Extremophiles on Earth Compared with Similar Environments in the Solar System,' illustrates the comparison between Earth's extremophile habitats and analogous environments elsewhere in the solar system.
claimThe United States Congress has directed NASA to seek out and discover extant life in habitable worlds within the Solar System.
claimAstrobiologists argue that the existence of extremophiles on Earth provides a basis to expect that life could exist in extreme environments on other planets or moons in the solar system and beyond.
claimExtremophiles serve as the central focus of NASA's strategy for detecting extraterrestrial life within the solar system.
Alternative Biochemistries: Speculations about Strange Possibilities pressbooks.cuny.edu 3 facts
claimSaturn’s moon, Titan, is the only world in the solar system besides Earth known to have liquid on its surface, specifically liquid methane (CH4) and ethane (C2H6), which are dominant due to the moon's low surface temperatures.
claimIn the solar system, the absence of liquid water as a solvent on a world is typically caused by conditions that keep the water either permanently frozen as a solid or in a perpetual gaseous state, sometimes causing it to escape the world's gravitational pull.
claimSubsurface oceans are known to exist on many worlds in the solar system, and it is likely that most liquid chemicals in the solar system are contained within these interior oceans.
Carbon may not be the only basis for life. Look for silicon, too bigthink.com Jul 1, 2022 3 facts
claimSaturn's moon Titan is considered the closest analog in the Solar System for silicon-based life because it is cold and lacks both oxygen and liquid water.
claimThe lower Venusian atmosphere and the near-subsurface of Jupiter's moon Io are two locations in the Solar System that contain significant amounts of sulfuric acid.
claimThe lower Venusian atmosphere and the near-subsurface of Jupiter’s moon Io are two locations in the Solar System that contain significant amounts of sulfuric acid.
Extraterrestrial life - Inters.org inters.org 3 facts
claimThe SETI (Search for Extraterrestrial Intelligence) program involves dedicating radio-telescopes to listen for intelligible signals originating from beyond the solar system.
claimHumans have not included religious information in the 'messages in a bottle' sent beyond the solar system, despite the majority of humans believing in a Creator.
claimScientific results acquired within the first decade of the 21st century tend to exclude the possibility of life forms on planets within the solar system due to prohibitive chemical and physical conditions in their atmospheric envelopes or on their surfaces.
(PDF) Reconsidering the Theological and Ethical Implications of ... academia.edu 2 facts
claimBeyond Mars, the Jovian moon Europa and asteroids within the sun's asteroid belt are considered the most likely locations for the discovery of life in the solar system.
claimBeyond Mars, the Jovian moon Europa and asteroids within the sun's asteroid belt are considered the most likely locations for the discovery of life in the solar system.
Astrobioethics | International Journal of Astrobiology | Cambridge Core cambridge.org Apr 10, 2017 2 facts
claimPlanetary Protection Protocols developed by the Committee on Space Research (COSPAR) include specific procedures for exploring Europa, Enceladus, and small bodies of the Solar System.
procedureThe Committee on Space Research (COSPAR) applies six specific questions when attempting to take samples from small bodies in the Solar System, as noted by Kminek and Rummel (2015).
Perspectives on the alien abduction phenomenon - Wikipedia en.wikipedia.org 2 facts
claimJ. Allen Hynek stated that until the late 1950s, it was believed there might be intelligent life on other planets within the Solar System, and consequently, abductees reported aliens coming from Mars, Jupiter, and Venus.
claimAbductees' claims regarding the origin of aliens changed after scientists discovered that intelligent life was unlikely to exist on other planets within the Solar System.
An Analysis of the Humanity's Messages to Extraterrestrial Intelligent ... sociostudies.org 2 facts
referenceThe Pioneer Plaque features a schematic of hydrogen, a diagram of the Solar System, the trajectory of the spacecraft, a radial pattern of 15 lines representing pulsar periods and the Sun's relative distance to the galactic center, and a silhouette of the spacecraft with two nude human figures.
claimThe Arecibo Message contained the numbers one through ten, the atomic numbers of the elements found in DNA, a DNA helix, a diagram of the Solar system, a sketch of the Arecibo telescope, a human figure, and a count of the human population.
Beyond Carbon-Based Life: Exploring Alternative Biochemistries in ... walshmedicalmedia.com 1 fact
claimAstrobiology missions, including Mars rovers and upcoming missions to Europa, are designed to explore the potential habitability of celestial bodies within the solar system.
The Great Silence (Philosophy and Fermi's Paradox) wearenotsaved.com Dec 1, 2018 1 fact
referenceMilan Ćirković categorizes the Fermi Paradox into three levels: ProtoFP (the absence of extraterrestrials on Earth is incompatible with our assumptions), WeakFP (the absence of evidence of extraterrestrials in the Solar System is incompatible with our assumptions), and StrongFP (the absence of any evidence for extraterrestrials anywhere).
Hypothetical types of biochemistry - Wikipedia en.wikipedia.org 1 fact
claimMethane is abundant in the Solar System and exists in liquid form on Titan, the largest moon of Saturn, leading to speculation that Titan could harbor methane-based life.
The Great Silence: Science and Philosophy of Fermi's Paradox goodreads.com May 3, 2018 1 fact
referenceMilan Ćirković defines 'WeakFP' as the observation that the absence of evidence of extraterrestrials in the Solar System is incompatible with current scientific assumptions.
Prebiotic chemistry and origin of living beings - Frontiers frontiersin.org Feb 3, 2026 1 fact
referenceMcKay (2011) discussed the search for life in the Solar System and its implications for science and society.
Extraterrestrial Intelligence and the Catholic Faith: A Brief History of ... catholicscientists.org 1 fact
referenceThe book 'Star Worlds and Their Inhabitants' (1884–1885) combined science, history, metaphysics, and theology to consider the probability of inhabitants on various celestial bodies within the solar system.