Articles tagged with Astrobiology
A collection of essays in Astrobiology presents various perspectives on defining life, including a minimal chemical life model and the importance of feedback loops. The authors propose new ideas and theories to help determine what is and is not considered living.
Researchers found that nickel isotopic fractionation may be a useful biomarker for identifying methanogenic microbes on the early Earth. The presence of specific isotopic fractions indicates biological processes, such as microbial assimilation or uptake of metals.
A team of scientists exposed a bacterium to Martian conditions, finding it couldn't survive the UV levels. Another study showed bacteria could survive with protection from the surface dust layer. These findings provide baseline studies for planetary exploration.
A new collection of papers explores how solar energy, winds, asteroid impacts, and changing magnetic fields shaped early Mars' environment. These findings suggest that the planet may have supported life during its history.
Scientists propose that structures in Vernal Crater depict areas of ancient spring activity, creating ideal locations to search for life evidence. Hot springs are crucial target areas for future Mars missions due to their ability to preserve fossilized microbial communities.
A new study analyzing historic samples from a classic origin-of-life experiment by NASA and university researchers found 22 amino acids, 10 of which were never seen before. The team discovered that volcanic eruptions could provide the necessary chemistry for life to emerge.
Classic experiments from 1953 may have simulated steam from volcanic eruptions, producing varied mixtures of organic compounds. This discovery points to the possible contribution of volcanism to life's beginning on Earth.
A classic Miller-Urey Synthesis experiment produced fewer organic molecules than its unpublished sibling study. The reanalyzed vials from the latter experiment revealed a wider variety of amino acids and amines.
NASA's Mars exploration program aims to analyze Martian samples using tools and instruments on Earth. The program provides a critical component of bringing samples back to Earth, enabling precise measurements and definitive life-detection assays.
A Cardiff University study suggests that the sun's movement through the Milky Way causes comets to collide with Earth every 35-40 million years, coinciding with mass extinctions like the dinosaurs' extinction. This cosmic 'bounce' effect may also have helped life spread by dispersing micro-organisms into space.
Scientists have found high levels of amino acids in two meteorites, indicating that the early solar system was a rich source of organic compounds. This discovery supports the idea that meteorites may have delivered these essential building blocks to Earth.
Researchers analyze comet Wild 2 samples, finding evidence of material formed at both cold and hot temperatures, and unusual organic molecules with oxygen and nitrogen content. The discovery raises questions about how these fragile materials survived capture and formed in the early solar system.
Scientists have found that macromolecular carbon in Martian meteorites is always associated with magnetite, a mineral catalyst for its formation. This association raises hopes that the meteorite's carbon complexes could be evidence of non-biological synthesis of organic molecules on Mars.
Researchers use diamond anvil cells to test bacteria's survival under extreme pressure, finding they can withstand conditions similar to deep ocean trenches and the deep crust. The study's findings raise questions about the impact of pressure on life's evolution and expand our understanding of potential habitable niches beyond Earth.
The University of Washington is launching a doctoral program in astrobiology, funded by a $2 million NSF grant. Students will study organisms living in extreme conditions on Earth to prepare for finding life on Mars and Europa.